Greenhorn Limestone
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.
| Greenhorn Limestone | |
|---|---|
| Stratigraphic range: Cenomanian-Turonian, around | |
The Jetmore Chalk Member of the Greenhorn Formation in Kansas. | |
| Type | Formation |
| Unit of | Colorado Group (lower), Benton Formation/Group, Mancos Shale (lower), or Cody Shale |
| Sub-units | Colorado members: Bridge Creek Limestone Hartland Shale Lincoln Limestone Kansas members: Pfeifer Shale (with Fencepost ls) Jetmore Chalk Hartland Shale Lincoln Limestone |
| Underlies | Carlile Shale |
| Overlies | Graneros Shale |
| Lithology | |
| Primary | Shale to chalky shale Limestone, chalk to marl |
| Other | bentonite |
| Location | |
| Coordinates | 38.277°N 104.713°W |
| Region | mid-continental |
| Country | United States |
| Type section | |
| Named for | Greenhorn Station, 14 mi south of Pueblo, CO, and for Greenhorn Creek |
| Named by | Grove Karl Gilbert |
| Year defined | 1896 |
Greenhorn Limestone (the United States) Greenhorn Limestone (Colorado) | |
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.