Current Issues of the Mountain Geologist
December 2025 | September 2025 | May 2025 | December 2024 | September 2024 | April 2024
Members have access the six most recent issues of The Mountain Geologist, which will remain on the RMAG web site approximately 18 months. Please note the expiration dates shown with each issue.
December 2025, THE MOUNTAIN GEOLOGIST, VOLUME 62, NUMBER 3
Geologic Map of the Shell Reservoir 7.5-minute quadrangle, Bighorm and Sheridan counties, Wyoming
Santosh Adhikari, Jeniffer Gifford
181
He:N2 Rations of Gases and What They Can Tell Us About Basement Generating Capacity of Helium: Clues from New Mexico
Ronald F. Broadhead
199
Permian Tsunami Deposits Across the Eastern Colorado Plateau
Richard J. Brose
215
Geochronology and Geomorphic Evolution of Beebe draw: Insights into the Ancestral South Platte River and the Colorado Piedmont
Alexander E. Marr
223
MEMBER ALERT. The December 2025 issue of The Mountain Geologist will be removed from the RMAG website approximately August 31, 2027. If you wish to download this issue, you must do so before this date.
September 2025, THE MOUNTAIN GEOLOGIST, VOLUME 62, NUMBER 2
Provenance of Post Larimide Paleogene Strata (White River group) at Pumpkin Buttes, Powder River Basin, Wyoming
Joseph Moll, Adam Trzinski, Celeste Saul, David Malone
113
Provenance Analysis of the Oligocene mountain Meadow Formation, Black Hills South Dakota, USA
Joseph R. Moll, Ryan T. Helgerson, David H. Malone, John P. Craddock
127
A New Hypothesis for Initiation of a Unaweep Canyon (Western Colorado) During the Laramide Orogeny
William C. Hood, Rex D. Cole
143
Formation of Oil and Gas Reservoirs that are not in Capillary Pressure Equilibrium
Monty Hoffman
165
MEMBER ALERT. The September 2025 issue of The Mountain Geologist will be removed from the RMAG website approximately May 31, 2027. If you wish to download this issue, you must do so before this date.
May 2025, THE MOUNTAIN GEOLOGIST, VOLUME 62, NUMBER 1
Intergrated stratigraphic and geochemical analysis of organic-rich intervals of the Lewis Shale in the eastern Washakie Basin, Wyoming
Jane S. Hearon, Justin E. Birdwell, Paul C. Hackley
5
Geologic Map of the Skull Ridge Quadrangle, Sheridan County, Wyoming, USA
Robert Andreoli, Jennifer Gifford, Shawn Malone, Chanler Samples, Jillian Dees, Benton Moore, Laysen Keel, Ethan Rodgers & John Perry
37
A New Look At The Regional Sequence Stratigraphic Framework Of The Classic Greenhorn T-R Cycle Across Northeastern, Colorado, Southeastern Wyoming, And Southwestern Nebraska
Kellen Peat, A.D. Donovan, M.C. Pope, F. Marcantonio
55
Tectonic Influence of the Transcontinental Arch on Sediment Provenance: Detrital Zircon Geochronology of the Middle Cambrian Flathead Sandstone, Bighorn Mountains, Wyoming
Joseph Moll, Shah Bilawal Ali, David Malone, Jeffrey Strasser, Jenny Arkle
87
MEMBER ALERT. The May 2025 issue of The Mountain Geologist will be removed from the RMAG website approximately December 31, 2026. If you wish to download this issue, you must do so before this date.
December 2024 THE MOUNTAIN GEOLOGIST, VOLUME 61, NUMBER 4
An Unusual Glacial Event in the Comanche Peak Wilderness Area, Larimer County, Colorado
Thomas D. Moeglin, Sanford Kaplan
251
Composite stratigraphic section across the mid-Miocene climatic optimum and transition in the Tesuque Formation, Espanola Basin, north-central New Mexico
Garrett R. Williamson, Dustin E. Sweet
259
MEMBER ALERT. The December 2024 issue of The Mountain Geologist will be removed from the RMAG website approximately June 30, 2026. If you wish to download this issue, you must do so before this date.
September 2024 THE MOUNTAIN GEOLOGIST, VOLUME 61, NUMBER 3
Mechanical Stratigraphy and Deformation of the Gobbler Anticline, Sacramento Mountains, New Mexico, USA
Joseph C. Syzdek, Christopher K. Zahm, Charles Kerans, David H. Malone
169
Characterization and Evolution of the Professor Valley Salt Body, Paradox Basin, Utah Using Integrated Geological, Geochemical and Geophysical(Gravity) Techniques
Derek T. Scott, Mark R. Baker, Diane I. Doser, Katherine A. Giles
201
A reinterpretation of the Jelm and Popo Agie formations (Triassic, Wyoming) as a distributive fluvial system (DFS) and the role f the accomodation/sedimentation ration in DFS deposition
Max E. Deckman, David M. Lovelace, Steven M. Holland
219
MEMBER ALERT. The September 2024 issue of The Mountain Geologist will be removed from the RMAG website approximately March 31, 2026. If you wish to download this issue, you must do so before this date.
April 2024 THE MOUNTAIN GEOLOGIST, VOLUME 61, NUMBER 2
Western Interior Carbonates: Wyoming's Rare Jurassic Oolitic Eolianites
James L. Strasen, Henry S. Chafetz
85
Geologic Map of Spanish Point 7.5 Minute Quadrangle, Big Horn County Wyoming (Scale 1:24,000)
Gracie Stevens, Sarah Rose Lesmann, William Finucane, David Malone
107
Investigations in the Late Eocene Castle Rock Conglomerate of Colorado from 1869 to the Present-Part 2: Geologic History, Age, Diagenesis, and Future Research
Stephen M. Keller, Matthew L. Morgan
125
A Reinterpretation of the Stratigraphy of the Upper Cretaceous Section in the Area of the Boulder-Weld Fault Zone East of Boulder, Colorado
Ken Kittleson, David Malone
151
MEMBER ALERT. The April 2024 issue of The Mountain Geologist will be removed from the RMAG website approximately October 31, 2025. If you wish to download this issue, you must do so before this date.
