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The Greenhorn Limestone or Greenhorn Formation is a geologic formation in the Great Plains Region of the United States, dating to the Cenomanian and Turonian ages of the Late Cretaceous period. The formation gives its name to the Greenhorn cycle of the Western Interior Seaway .
The Blue Hills escarpment forms the boundary with the High Plains to the west. [ 5 ] The Environmental Protection Agency divides the region into two Temperate grasslands, savannas, and shrublands ecoregions : the Smoky Hills proper constituting the Smoky Hills Ecoregion in the east; and the Blue Hills and Chalk Bluffs constituting the Rolling ...
[4] [5] The highest peak in the Wet Mountains, Greenhorn Mountain, at 12,346 feet (3,763 meters), overlooks the valley from the west and dominates the view. [6] Greenhorn Creek rises on Greenhorn Mountain and traverses the valley which is situated where the creek leaves the mountains and emerges onto the Great Plains. The valley has an ...
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Fencepost limestone, Post Rock limestone, or Stone Post is a stone bed in the Great Plains notable for its historic use as fencing and construction material in north-central Kansas resulting in unique cultural expression. The source of this stone is the topmost layer of the Greenhorn Limestone formation.
F.B. Meek and F.V. Hayden originated the scientific names for the series of Cretaceous rocks in the central Great Plains of the North American Continent.They gave the name "Benton" to the great shale deposits between the sandstone bluffs at Dakota City, Nebraska, and the chalk bluffs at the junction of the Niobrara and Missouri rivers.
Colorado is a geologic name applied to certain rocks of Cretaceous age in the North America, particularly in the western Great Plains.. This name was originally applied to classify a group of specific marine formations of shale and chalk known for their importance in Eastern Colorado.
In the "mile high" plains in the center of the continent, the named layers preserve marine fossils from the Late Cretaceous Period. The term Benton Limestone has also been used to refer to the chalky portions of the strata, especially the beds of the strata presently classified as Greenhorn Limestone, particularly the Fencepost limestone.