Judith River Formation
Geological formation
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The Judith River Formation is a fossil-bearing geologic formation in Montana, and is part of the Judith River Group. It dates to the Late Cretaceous, between 79 and 75.3 million years ago, corresponding to the "Judithian" land vertebrate age. Wikipedia
Age: between 79 and 75.3 million years ago
Thickness: max 360 meters (1,180 ft)
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