I am currently part of a project focusing on western USA regional Cenozoic unconformities. We presented some of our results at the 2023 Geological Society of America (GSA Connects 2023) meeting held in Pittsburgh, PA 10/15-18, 2023, but I thought I’d post a brief recap of our presentation below. Our study area lies within western…
Category: Montana Eocene
Field Trip! Eocene-Oligocene Geology and Vertebrate Paleontology, Northern Jefferson Valley, Southwest Montana
Eocene-Oligocene Geology and Vertebrate Paleontology of the Northern Jefferson Valley, Southwest Montana Field Trip Sponsored by the Montana Geological Society Field Trip Information: Saturday July 8th, 2023 Trip Leaders: Deb Hanneman (Whitehall GeoGroup Inc., Whitehall, MT) Don Lofgren (Raymond M. Alf Museum of Paleontology, Claremont, CA) On this field trip we will visit: – Late…
Late Eocene-early Oligocene Travertine Deposits and their Correlation with High-Elevation Tertiary Strata, Gravelly Range-Greater Yellowstone Region, Southwest Montana
My field work in the Gravelly Range of southwest Montana has been on-going for a few years. Each field season there usually are field crews from the Alf Museum/Webb Schools headed up by Don Lofgren, along with many other earth scientists from a variety of places working together in the Gravelly Range. We base our…
Priabonian, late Eocene chronostratigraphy, depositional environment, and paleosol-trace fossil associations, Pipestone Springs, southwest Montana, USA
Finally – the work done by myself and my co-authors, Don Lofgren, Steve Hasiotis, and Bill McIntosh, is published in the new issue of Acta Palaeontologica Polonica 67 (1): 5–20. Our work combines chronostratigraphy with depositional environment interpretations and paleosol-trace fossil associations for a new view of a well-known Eocene vertebrate locality in southwest Montana….
Flagstaff Rim, Wyoming – A Classic Area of Continental Eocene Tuffs and Fossil Vertebrates
The Flagstaff Rim area in central Wyoming contains a classic geological section of Tertiary continental rocks that, for the most part, range in age from approximately 37 million years to about 35 million years. These strata are then capped by gravels that may be late Tertiary in age (probably younger than 20 million years in…
Welcome To My 2021 Field Office
My geological field work lately has taken me to several areas of western Montana, so I thought I’d do a visual collage of a few of the landscapes where I’ve been working. To start with, I’ve been spending time flying drones over Tertiary exposures in southwestern Montana, Great fun and good insight into Tertiary…
LATE EOCENE CHRONOSTRATIGRAPHY, DEPOSITIONAL ENVIRONMENT, AND PALEOSOL-TRACE FOSSIL ASSOCIATIONS, PIPESTONE SPRINGS, SOUTHWEST MONTANA
I just received notice from the Geological Society of America (GSA) that our abstract is now accepted for the GSA 2020 annual meeting. I was very much looking forward to going to Montreal for the meeting, but like much else, it will now be virtual. Our presentation is scheduled for the session titled “D23. Recent…