TABLE OF CONTENTS

Title Page

Stratigraphic Chart

Table of Contents

Dedication

Memorials

President's Letter

Editors' Comments

WGA Officers

List of Advertisers

I. Regional Stratigraphy

Devono-Mississippian Discontinuities in the Northern Rocky Mountains and their Regional Significance...Harold A. Boyd

The Shannon Sandstone, Salt Creek Area, Wyoming...Roderick W. Tillman

Recognition of a Distal Facies Greatly Extends the Domain of the Deer Creek Debris Avalanche Deposit: "Eocene" Absoraka Range, Wyoming...David H. Malone

II. Oil and Natural Gas

Serendipity, the Story behind the Discovery of the Grieve Field, "Fault Trap Accumulation"...Don E. Lawson

South Glenrock, Sand Dunes-Derrick Draw Meander Belt, Southwest Powder River Basin, Wyoming...Richard P. Swirzynski

Depositional and Diagenetic Controls on Porosity Distribution at Buck Draw Field, Campbell and Converse Counties, Wyoming...Greg P. Anderson and Wendy J. Harrison

The Triangle "U" Sussex Unit: A Chemical Flood Case History...Julie Smith and Dan Larson

Relationship between Fracture Treatment Shut-ins, Reservoir Permeability and Production Responses...J. D. Harkrider, W. W. Aud, J. O. Whittington

Selection of Long Interval Limited-entry or Point-Source Stimulation Treatments: A Review of Historic Data and an Economic Comparison...John Sutton

III. Economic Minerals

Diamond Exploration Potential of the Wyoming Craton, Western United States, USA...W. Dan Hausal, Richard E. Kucera, Tom E. McCandless, Robert W. Gregory

Fifty Years of Wyoming Trona Mining...Ray E. Harris