Brule Formation

The Brule Formation was deposited between 34 and 30 million years ago, roughly the Rupelian (Oligocene). It is a sequence of fine grained clastic rocks (claystones, mudstones, siltstones) interbeded with freshwater carbonates, volcanic ash (tuff), and sandstone.

Contents

• Fossil turtle stylemys nebrascensis oligocene brule formation white river badlands pennington
• Rare and incredible fossil horse skull mesohippus bairdi early oligocene brule formation white
• References

The sandstones layers, which are up to 3 m thick, can contain mammalian fossils (e.g. the Fitterer bed). The most important fossils sites are:

Cat fish, several mammals such as nimravids and hesperocyon and sunfish fossils are known from the Brule Formation in Badlands National Park. Notable among the local fauna are bathornithid birds, ranging from the highly varied wetland-dwelling Bathornis species to the gigantic Paracrax.