Natural History

Brule Formation

The Brule Formation is a sequence of fine grained clastic rocks (claystones, mudstones, siltstones) interbedded with freshwater carbonates, volcanic ash (tuff), and sandstonein South Dakota, Nebraska, Colorado, North Dakota, and Wyoming. It was deposited between 34 and 30 million years ago, roughly the Rupelian age (Oligocene). It occurs as a subunit of the White River Group.

Also on this shelf

See also

• ▸Hildegarde Howard
• ▸Feathered dinosaur
• ▸Cetacean

Uncatalogued shelf

Text from Wikipedia; plate via Wikimedia Commons. Text CC BY-SA 4.0; plate freely licensed (see Commons). Source record. Images and catalogue data are reproduced from open-access collections.