<SUBMISSION>
<ACCESSION-NUMBER>0001104659-07-081851
<TYPE>424B7
<PUBLIC-DOCUMENT-COUNT>1
<FILING-DATE>20071109
<DATE-OF-FILING-DATE-CHANGE>20071109
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>ST MARY LAND & EXPLORATION CO
<CIK>0000893538
<ASSIGNED-SIC>1311
<IRS-NUMBER>410518430
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>424B7
<ACT>33
<FILE-NUMBER>333-143815
<FILM-NUMBER>071232789
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>1776 LINCOLN ST STE 700
<CITY>DENVER
<STATE>CO
<ZIP>80203
<PHONE>303-861-8140
</BUSINESS-ADDRESS>
</FILER>
<DOCUMENT>
<TYPE>424B7
<SEQUENCE>1
<FILENAME>a07-29024_1424b7.htm
<DESCRIPTION>424B7
<TEXT>
<html>

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<body lang="EN-US" style="text-justify-trim: punctuation">

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<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.0%;">
 <tr>
  <td width="52%" valign="top" style="padding:0in .7pt 0in .7pt;width:52.44%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">PROSPECTUS SUPPLEMENT NO. 3</font></b></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:5.52%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in .7pt 0in .7pt;width:42.02%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Filed
  Pursuant to Rule 424(b)(7)</font></p>
  </td>
 </tr>
 <tr>
  <td width="52%" valign="top" style="padding:0in .7pt 0in .7pt;width:52.44%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">(To Prospectus Dated June 15, 2007)</font></b></p>
  </td>
  <td width="5%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:5.52%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="42%" valign="top" style="padding:0in .7pt 0in .7pt;width:42.02%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Registration No.
  333-143815</font></p>
  </td>
 </tr>
</table>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">$287,500,000</font></b></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">St.
Mary Land &amp; Exploration Company</font></b></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">3.50% Senior Convertible Notes
due 2027</font></b></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">and Common Stock Issuable Upon Conversion
of 3.50%</font></b></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Senior Convertible Notes due 2027</font></b></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="color:windowtext;margin:0in 0in 12.0pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This prospectus
supplement no. 3 supplements and amends our prospectus dated June 15, 2007, as
amended and supplemented by prospectus supplement no. 1 dated July 20, 2007 and
prospectus supplement no. 2 dated August 21, 2007 (collectively, the &#147;Prospectus&#148;),
relating to the resale from time to time by certain selling securityholders of
up to $287,500,000 principal amount of the notes and the shares of common stock
issuable upon conversion of the notes.</font></p>

<p style="color:windowtext;margin:0in 0in 12.0pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">This prospectus
supplement no. 3 should be read in conjunction with and accompanied by the
Prospectus and is qualified by reference to the Prospectus, except to the
extent that the information in this prospectus supplement no. 3 supersedes the
information contained in the Prospectus.</font></p>

<p style="color:windowtext;margin:0in 0in 12.0pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The information appearing
in the table below, which is based on information provided by or on behalf of
the named selling securityholders, supplements and amends, by addition or
substitution, as applicable, the information in the table appearing under the
heading &#147;Selling Securityholders&#148; in the Prospectus.&#160; The percentage of notes outstanding
beneficially owned by each selling securityholder is based on $287,500,000
aggregate initial principal amount of notes outstanding.</font></p>

<table border="0" cellspacing="0" cellpadding="0" width="100%" style="border-collapse:collapse;width:100.04%;">
 <tr>
  <td width="40%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:40.88%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;"><br>
  <br>
  Name</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="12%" colspan="2" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:12.32%;">
  <p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Aggregate<br>
  Principal<br>
  Amount of<br>
  Notes That<br>
  May Be Sold</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.94%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:12.12%;">
  <p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;"><br>
  <br>
  Percentage<br>
  of Notes<br>
  Outstanding</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.32%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;">Number of<br>
  Shares of<br>
  Common Stock<br>
  That May Be<br>
  Sold (1)</font></b></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
  <td width="12%" valign="bottom" style="border:none;border-bottom:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;"><b><font size="1" face="Times New Roman" style="font-size:8.0pt;font-weight:bold;"><br>
  Percentage of<br>
  Shares of<br>
  Common Stock<br>
  Outstanding</font></b></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.22%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><b><font size="1" face="Times New Roman" style="font-size:1.0pt;font-weight:bold;">&nbsp;</font></b></p>
  </td>
 </tr>
 <tr>
  <td width="40%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in .7pt 0in .7pt;width:40.88%;">
  <p style="color:windowtext;margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">BNP Paribas Arbitrage (2)</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in .7pt 0in .7pt;width:1.52%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;border-top:solid windowtext 1.0pt;padding:0in .7pt 0in .7pt;width:10.8%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">4,000,000</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.94%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in .7pt 0in .7pt;width:12.12%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.39</font></p>
  </td>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:2.32%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">73,503</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;border:none;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.12</font></p>
  </td>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:2.22%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
 </tr>
 <tr>
  <td width="40%" valign="top" style="padding:0in .7pt 0in .7pt;width:40.88%;">
  <p style="color:windowtext;margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Credit Suisse Securities (USA) LLC (3)</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.52%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:10.8%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">3,000,000</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.94%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:12.12%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.04</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.32%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
  <td width="12%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">55,128</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.09</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.22%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
 </tr>
 <tr>
  <td width="40%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:40.88%;">
  <p style="color:windowtext;margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">J-Invest Ltd.</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.52%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:10.8%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1,900,000</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.94%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:12.12%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.66</font></p>
  </td>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:2.32%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">34,914</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.06</font></p>
  </td>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:2.22%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
 </tr>
 <tr>
  <td width="40%" valign="top" style="padding:0in .7pt 0in .7pt;width:40.88%;">
  <p style="color:windowtext;margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">JABCAP Multi Strategy Master Fund Limited</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.52%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:10.8%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">8,100,000</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.94%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:12.12%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2.82</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.32%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
  <td width="12%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">148,844</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.24</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.22%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
 </tr>
 <tr>
  <td width="40%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:40.88%;">
  <p style="color:windowtext;margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Jefferies &amp; Company, Inc. (3)</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.52%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:10.8%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">2,000,000</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.94%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:12.12%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.70</font></p>
  </td>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:2.32%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">36,752</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.06</font></p>
  </td>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:2.22%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
 </tr>
 <tr>
  <td width="40%" valign="top" style="padding:0in .7pt 0in .7pt;width:40.88%;">
  <p style="color:windowtext;margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Platinum Grove Contingent Capital Master Fund Ltd.</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.52%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:10.8%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">16,500,000</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.94%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:12.12%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5.74</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.32%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
  <td width="12%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">303,200</font></p>
  </td>
  <td width="1%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.48</font></p>
  </td>
  <td width="2%" valign="bottom" style="padding:0in .7pt 0in .7pt;width:2.22%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
 </tr>
 <tr>
  <td width="40%" valign="top" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:40.88%;">
  <p style="color:windowtext;margin:0in 0in .0001pt 10.0pt;text-indent:-10.0pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Wachovia Securities International Ltd. (4)</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.52%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">$</font></p>
  </td>
  <td width="10%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:10.78%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">5,000,000</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.94%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:12.12%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">1.74</font></p>
  </td>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:2.32%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">91,879</font></p>
  </td>
  <td width="1%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:1.96%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:1.0pt;">&nbsp;</font></p>
  </td>
  <td width="12%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:12.14%;">
  <p align="right" style="color:windowtext;margin:0in 0in .0001pt;text-align:right;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">0.15</font></p>
  </td>
  <td width="2%" valign="bottom" bgcolor="#CCEEFF" style="background:#CCEEFF;padding:0in .7pt 0in .7pt;width:2.22%;">
  <p style="color:windowtext;margin:0in 0in .0001pt;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">%</font></p>
  </td>
 </tr>
</table>

<div style="color:windowtext;margin:0in 0in .0001pt;text-indent:0in;"><hr size="1" width="25%" noshade color="black" align="left"></div>

<p style="color:windowtext;font-size:10.0pt;margin:0in 0in 12.0pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(1)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>Represents the maximum
number of shares of our common stock issuable upon conversion of all of the
holder&#146;s notes, based on the initial conversion rate of 18.3757 shares of our
common stock per $1,000 principal amount at maturity of the notes.&#160; However, this conversion rate will be subject
to adjustment as described under &#147;Description of Notes&#151;Conversion Rights.&#148;&#160; As a result, the amount of common stock
issuable upon conversion of the notes may increase or decrease in the future.</p>

<p style="color:windowtext;font-size:10.0pt;margin:0in 0in 12.0pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(2)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>This selling
securityholder is an affiliate of BNP Paribas Securities Corp., which is a
broker-dealer and was a co-manager and initial purchaser in the initial
offering of the St. Mary Land &amp; Exploration Company (the &#147;Company&#148;)
notes.&#160; An affiliate of BNP Paribas
Securities Corp. and this selling securityholder is a 10.8% lender participant
in the Company&#146;s revolving credit facility and a counterparty under its hedging
agreements.</p>

<p style="color:windowtext;margin:0in 0in 12.0pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="color:windowtext;margin:0in 0in 12.0pt;text-indent:0in;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

</div>
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<div style="font-family:Times New Roman;">

<p align="center" style="color:windowtext;margin:0in 0in 12.0pt;text-align:center;text-indent:0in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="color:windowtext;font-size:10.0pt;margin:0in 0in 12.0pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(3)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>This selling
securityholder is a broker-dealer.</p>

<p style="color:windowtext;font-size:10.0pt;margin:0in 0in 12.0pt .75in;text-indent:-.25in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">(4)</font><font size="1" style="font-size:3.0pt;">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160; </font>This selling
securityholder is a broker-dealer and an affiliate of Wachovia Capital Markets,
LLC (&#147;WCM&#148;), which is also a broker-dealer.&#160;
WCM was a joint book-running manager and an initial purchaser in the
initial offering of the notes.&#160; This
selling securityholder is also affiliated with Wachovia Bank, National
Association (&#147;Wachovia&#148;), which serves as the issuing bank, administrative
agent and a 11.05% lender participant in our revolving credit facility.&#160; Wachovia is also a counterparty under our
hedging agreements.</p>

<p style="color:windowtext;margin:0in 0in 12.0pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Based upon information provided by the selling
securityholders, none of the selling securityholders nor any of their
affiliates, officers, directors or principal equity holders has held any
position or office or has had any material relationship with us within the past
three years, except as disclosed in the Prospectus and this prospectus
supplement no. 3.&#160; None of the selling
securityholders listed above will own 1% or more of our outstanding common
stock after this offering.</font></p>

<p style="color:windowtext;margin:0in 0in 12.0pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Selling securityholders who are registered
broker-dealers or affiliates of registered broker-dealers may be deemed to be &#147;underwriters&#148;
within the meaning of the Securities Act.&#160;
To our knowledge, no selling securityholder who is a registered
broker-dealer or an affiliate of a registered broker-dealer received any
securities as underwriting compensation.</font></p>

<p style="color:windowtext;margin:0in 0in 12.0pt;text-indent:.5in;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">Information concerning the selling securityholders may
change from time to time and any changed information will be set forth in
additional supplements to the Prospectus if and when necessary.&#160; In addition, the conversion rate and,
therefore, the number of shares of common stock issuable upon conversion of the
notes, is subject to adjustment under certain circumstances.</font></p>

<p style="color:windowtext;margin:0in 0in .0001pt;text-autospace:none;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Investing in the notes and our common stock
issuable upon conversion of the notes involves risks that are described in the &#147;Risk
Factors&#148; section beginning on page 8 of the Prospectus.</font></b></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<p style="color:windowtext;margin:0in 0in 12.0pt;text-indent:.5in;"><b><font size="2" face="Times New Roman" style="font-size:10.0pt;font-weight:bold;">Neither
the Securities and Exchange Commission nor any state securities commission has
approved or disapproved of these securities or determined if this Prospectus is
truthful or complete.&#160; Any representation
to the contrary is a criminal offense.</font></b></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">The date of this
prospectus supplement is November 9, 2007.</font></p>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

<div style="color:windowtext;margin:0in 0in .0001pt;text-autospace:none;"><hr size="3" width="100%" noshade color="#010101" align="left"></div>

<p align="center" style="color:windowtext;margin:0in 0in .0001pt;text-align:center;text-autospace:none;"><font size="2" face="Times New Roman" style="font-size:10.0pt;">&nbsp;</font></p>

</div>
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