Two Medicine Formation, Geological formation in Montana and Alberta
The Two Medicine Formation extends across northwestern Montana and southern Alberta, containing substantial deposits of sandstone from the Late Cretaceous period.
Eugene Stebinger and his geological survey team conducted the first scientific documentation of the formation in 1914, establishing its geological significance.
The formation holds numerous dinosaur fossils, including the Maiasaura specimens at Egg Mountain, which revolutionized understanding of prehistoric animal behavior.
Researchers access the formation through designated areas in Montana and Alberta, with western sections reaching 600 meters in thickness.
The formation contains distinct layers of river and delta deposits between marine Bearpaw Shale above and nearshore Virgelle Sandstone below.
Location: Montana
Location: Alberta
Part of: Montana Group
GPS coordinates: 48.07420,-112.29900
Latest update: March 8, 2025 07:41
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