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: Tertiary tuff
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…
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…
EOCENE AND OLIGOCENE MAMMALS FROM THE GRAVELLY RANGE OF SOUTHWEST MONTANA
Our first paper on work that several of us are doing in the Gravelly Range, southwestern Montana, was just published in a special issue of Paludicola, Scientific Contributions of the Rochester Institute of Vertebrate Paleontology. This issue contains papers in honor of James Gilbert Honey, a paleontologist and stratigrapher who focused on the Cenozoic, particularly…
Tertiary geology and paleontology of the central Gravelly Range – a project update
It’s time for our yearly update talk on field work and data compilation for the Tertiary geology and paleontology of the central Gravelly Range project in southwestern Montana. The Madison Ranger District in Ennis, Montana (5 Forest Service Road) will be hosting my talk on Monday, April 2nd at 10am in the Madison Ranger District conference room….
Cenozoic Sequence Stratigraphy of Southwestern Montana
Much of my research has been focused on Cenozoic sequence stratigraphy of continental basin-fill in southwestern Montana. This approach to the stratigraphy of continental deposits has facilitated correlation of stratigraphic units both within and among the various basins of this area. I recently gave a talk about my work in this area at Montana Tech…
Earl Douglass and the Tertiary Geology of Southwest Montana’s Madison Bluffs
Most vertebrate paleontologists probably think of the spectacular dinosaur finds near Jensen, Utah, when the name Earl Douglass is mentioned. Douglass’s discovery of a partial Apatosaurus near Jensen in 1909 did spark the beginning of his long career with finding more dinosaur material in what we now know as Dinosaur National Monument. But Douglass began his quest for…