North Dakota Stratigraphy Poebrotherium ROCK ROCK UNIT COLUMN PERIOD EPOCH AGES MILLIONS OF YEARS AGO Common Name: Holocene Oahe .01 Camel
Coleharbor Pleistocene QUATERNARY Classification: 1.8 Pliocene Unnamed 5 Miocene Class: Mammalia 25 Arikaree Order: Artiodactyla Family: Camelidae Brule Oligocene
38 South Heart Chadron Description: Chalky Buttes
Camels Butte Camels first evolved in North America, and modern camels are the Eocene Golden 55 Valley Bear Den remnants of a formerly much more widespread and diverse group. Poebrotherium was one of these early camels that inhabited the Sentinel Butte open-woodland areas of North Dakota about 30 million years TERTIARY ago. They were lightly built and were goat-sized, about 3 feet long. Their head, with a distinctive narrow snout, and long neck looked similar to a modern-day llama. Their slender, hind legs Bullion
Paleocene Creek were longer than their forelegs and they had hoofed toes. They were efficient runners. Poebrotherium had long jaws and their
Slope front teeth extended forward as in living camels which allowed the
Cannonball animal to snip off vegetation.
Ludlow 65
Hell Creek
Fox Hills
ACEOUS Pierre CRET
84 Niobrara
Carlile
Carbonate Calcareous Shale Claystone/Shale
Siltstone Sandstone Sand & Gravel
Mudstone Lignite Glacial Drift
Poebrotherium. Painting courtesy of Kingfisher Publications.
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