Blackleaf Formation, Geological formation in Beaverhead County, Montana, United States.
Blackleaf Formation is a geological layer in Beaverhead County composed of three mudrock units containing sandstone, mudstone, shale, siltstone, and calcareous deposits. These layers reveal how sediment accumulated in this region over millions of years.
The layer formed between 105 and 94 million years ago during the Lower Cretaceous, when sediments accumulated across southwestern Montana. This period marks a key chapter in the region's geological development.
Scientists study the formation's fossil records, including specimens of Oryctodromeus cubicularis and plant species like Araliaephyllum westonii, to understand prehistoric ecosystems.
This formation is primarily accessible to geology professionals and researchers seeking specialized geological data. Detailed information is documented in scientific publications and geological survey reports.
The lower sections contain fossils of small dinosaurs and ancient plants from different geological periods. These finds help scientists understand which life forms inhabited the region at that time.
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