UNITED STATES

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                   FORM 8-K/A

                                  AMENDMENT TO

                                 CURRENT REPORT

     PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

                Date of Report (Date of earliest event reported):

                           June 22, 2000 (May 3, 2000)

                       ST. MARY LAND & EXPLORATION COMPANY
             (Exact name of registrant as specified in its charter)

    Delaware                        0-20872                      41-0518430
 (State or other               (Commission File                (I.R.S Employer
 jurisdiction of                    Number)                  Identification No.)
incorporation or
  organization)


             1776 Lincoln Street, Suite 1100, Denver, Colorado 80203

               (Address of principal executive offices) (Zip Code)


       Registrant's telephone number, including area code: (303) 861-8140


                                 Not applicable

          (Former name or former address, if changed since last report)


EXPLANATORY NOTE:

          This  amendment  to the Current  Report on Form 8-K filed May 18, 2000
     relates to the acquisition of certain  producing and  nonproducing  oil and
     gas properties  from  Tipperary  Corporation on May 3, 2000. The purpose of
     this amendment is to file the underlying  Purchase and Sale Agreement dated
     April 10, 2000 as an exhibit to this report and to indicate  that financial
     statements for the acquired properties and pro forma financial  information
     are not required to be filed with this report.

ITEM 2.  ACQUISITION OR DISPOSITION OF ASSETS.

          On May 3, 2000, St. Mary Land & Exploration  Company (the  "Company"),
     through a subsidiary,  acquired certain  producing and nonproducing oil and
     gas properties in the Williston  Basin in eastern Montana and western North
     Dakota from Tipperary  Corporation  for a purchase price of $7.6 million in
     cash.  The  transaction  was  consummated  pursuant to a Purchase  and Sale
     Agreement dated April 10, 2000, effective as of March 1, 2000.

ITEM 7.    FINANCIAL STATEMENTS AND EXHIBITS.

     (a)    Financial statements of businesses acquired.

          Financial statements  for the  acquired properties are not required to
     be filed with this report.

     (b)    Pro forma financial information.

          Pro forma financial statements which give effect to the acquisition of
     the acquired  properties  are not required to be filed with this report.

     (c)    Exhibits.

          The following exhibit is furnished as part of this report:

          Exhibit 10.1   Purchase and  Sale  Agreement  dated  April  10,  2000,
                         effective as of March 1, 2000; between  Nance Petroleum
                         Corporation and Tipperary Oil & Gas Corporation *

     ---------------
     *  Filed herewith.


                                   SIGNATURES
                                   ----------

     Pursuant to the  requirements  of the  Securities and Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned hereunto duly authorized.

                           ST. MARY LAND & EXPLORATION COMPANY

Date: June 22, 2000            By /s/ MARK A. HELLERSTEIN
                               --------------------------
                               Mark A. Hellerstein
                               President and Chief Executive
                               Officer

Date: June 22, 2000            By /s/ RICHARD C. NORRIS
                               ------------------------
                               Richard C. Norris
                               Vice President - Finance,
                               Treasurer and Secretary