St. Mary River Formation, Geological formation in Alberta, Canada and Montana, United States.
The St. Mary River Formation extends across southwestern Alberta and northwestern Montana, containing layers of sandstone, mudstone, and coal deposits.
The formation dates back to the Late Cretaceous period, approximately 71.9 to 67 million years ago, when George Mercer Dawson first documented it in 1883.
The sedimentary layers of the formation hold numerous fossils, including dinosaur footprints, plant remains, and marine creatures from ancient environments.
Researchers access the formation through various locations across Alberta and Montana, with a maximum thickness reaching 762 meters in certain areas.
The formation contains over 100 track-bearing stratigraphic units showing evidence of both ornithischian and theropod dinosaur activities during the Late Cretaceous period.
Location: Alberta
Location: Montana
GPS coordinates: 49.60000,-114.10000
Latest update: March 6, 2025 07:38
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