The Chalk Bluffs is a barren chalk escarpment in the northeastern part of the U.S. state of Colorado, stretching from the Wyoming border east of I-25 to near the South Platte River in Logan County and Weld County. Parks.state.co.us: Chalk Bluffs Natural Area
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Geology

The Chalk Bluffs exposes the Ogallala, Fox Hills and Arikaree Formations. Miocene, Eocene and Paleocene vertebrate fossils are found.

Ecology

Most of the escarpment lies within the

Pawnee National Grasslands Pawnee National Grassland is a United States National Grassland located in northeastern Colorado on the Colorado Eastern Plains. The grassland is located in the South Platte River basin in remote northern and extreme northeastern Weld County bet ...

. As the bluffs are primarily barren and protected from fire. However trees normally found in the foothills of the Rocky Mountains are found there, including: Ponderosa pine,

Rocky Mountain juniper ''Juniperus scopulorum'', the Rocky Mountain juniper, is a species of juniper native to western North America, from southwest Canada to the Great Plains of the United States. Description ''Juniperus scopulorum'' is a small evergreen conifer rea ...

, limber pine, and mountain mahogany. Numerous raptors nest on the cliffs including Swainson's hawks, ferruginous hawks, golden eagles, and prairie falcons. The bluffs are a favorite site for birdwatching. It has been recognized by the

National Audubon Society The National Audubon Society (Audubon; ) is an American non-profit environmental organization dedicated to conservation of birds and their habitats. Located in the United States and incorporated in 1905, Audubon is one of the oldest of such organ ...

as a site of "global importance".

Chalk Bluffs Natural Area

A portion of the Chalk Bluffs in Weld County were set aside in September 2001 by the Colorado State Parks Natural Areas Program as the Chalk Bluffs Natural Area.

Wind farm

The bluffs are adjacent to the

Cedar Creek Wind Farm The Cedar Creek Wind Farm is a 551.3 megawatt (MW) wind farm located about 8 miles east of the town of Grover in north-central Weld County, Colorado. It consists of 397 wind turbines and was constructed in two phases, Cedar Creek I an ...

References

{{coord, 36.47952, -90.16252, type:landmark_globe:earth_region:US-CO, display=title Escarpments of the United States Chalk Landforms of Colorado Nature reserves in Colorado Landforms of Weld County, Colorado Landforms of Logan County, Colorado Protected areas of Logan County, Colorado Protected areas of Weld County, Colorado Neogene Colorado Paleogene Colorado Miocene United States Eocene North America Paleocene North America Eocene paleontological sites of North America Miocene paleontological sites of North America Protected areas established in 2001 2001 establishments in Colorado