Tsarin Brule

An ajiye Formation na Brule tsakanin shekaru miliyan 34 da 30 da suka wuce, kusan shekarun Rupelian ( Oligocene ).  Yana faruwa a matsayin wani yanki na rukunin White River Group a South Dakota, Nebraska, Colorado, North Dakota, da Wyoming .

Yana da jeri na kyawawan duwatsu masu ƙyalƙyali ( dutsen yumɓu, dutsen laka, siltstones ) tare da carbonates na ruwa mai tsabta, ash mai aman wuta ( tuff ), da dutsen yashi . 

 Bayanin tarihi 
NH Darton ya kira wannan tsari na "ga ƴan Indiyawan Brule, waɗanda suka taɓa yawo a kan Pine Rldge Ind. Res. a kudancin S. Dak., inda fm. ya rufe manyan yankuna, kuma ba a cikin Brule Ind. Res., wanda ke faruwa a nesa NE A S. Dak." Darton ta farko bayanin ya bayyana, "The White River gadaje A cikin tsawo daga S. Dak. A cikin Nebr. gabatar da wasu bambance-bambance a cikin strat. iyaka da kuma dangantaka. Suna faɗaɗa da yawa kuma sun hada da, a saman, gadaje wanda ya bayyana ba a wakilta a cikin hankula yankuna. Saboda haka, don ba da ma'anoni daban-daban ga mambobi a Nebr. Na Gabatar da nadi na Brule lãka da kuma raba da Challenge Bed Titanm a karkashin babban gado. Na wuya, yashi, na kodadde-pink launi. A cikin kusanci da Wyo NB a cikin So. NH Darton, 1898 (D, 8, G, S, 19th Ann, Eept., pt 4, shafi. 736, 766–759). (Takaitacce suna cikin takaddar tushe.) 

 Rikodin burbushin halittu 
Yashin dutsen yashi, wanda ya kai  mai kauri, zai iya ƙunsar burbushin dabbobi masu shayarwa (misali gadon Fitterer). Muhimman wuraren burbushin halittu sune: 

 Fitterer Ranch
 Obritsch Ranch
 M&M Ranch
 Ƙananan Badlands a cikin Stark County, ND
 Chalky Buttes (ciki har da White Butte) a cikin gundumar Slope, ND

Kifin da aka rigaya ya rigaya, da dabbobi masu shayarwa irin su nimravids da Hesperocyon, da burbushin sunfish an san su daga Tsarin Brule a cikin Badlands National Park . 

Sanannu a cikin dabbobin gida akwai tsuntsayen Bathornithid, kama daga nau'ikan Bathornis iri-iri iri-iri zuwa babban Paracrax .

 Fauna 
Fauna ta ruwaito daga Brule Formation Halitta Nau'o'i Wuri Matsayi mai mahimmanci Kayan abu Bayani Hotuna Proscalops  Proscalps tertius  Da yawa, gami da incisor na sama da molar.  Ana iya samun nau'ikan holotype a nan.  Hesperocyon H. gregarius Hyaenodon H. horridus  Hyracodon H. nebraskensis SD, ND, NE Gutsutsun muƙamuƙi, kwanyar kai Rhinoceros na farko Subhyracodon S . occidentalis NE, SD, ND, WY Hakora da kokon kai Rhinoceros na farko Eporeodon E. babba SD Abin mamaki da wuya Babban oredodont Leptauchenia L. kayan ado SD, NE Hakora da kokon kai Ƙananan Oreodont Merycoidodon M. culbertsoni
 M. gracilis SD, ND, NE, WY Kwankwan kai, kasusuwa, da kwarangwal Oreodont Poebrotherium P. Wilson SD, ND, NE, WY Kasusuwa, guntun jaw Rakumi na farko Leptomeryx SD, NE, WY Hakora Barewa mai kama da dabba Archeotherium A. Morton WY Hakora da kokon kai Entelodont

 Manazarta