DescriptionChalk badlands (Niobrara Formation, Upper Cretaceous; Castle Rock & nearby chalk bluffs, Gove County, Kansas, USA) 3 (38442722884).jpg
Chalk in the Cretaceous of Kansas, USA.
These are chalk outcrops near Castle Rock, a famous cluster of chalk pillars south of Quinter, Kansas. Chalk is a biogenic, calcitic, marine sedimentary rock composed of numerous coccolith microfossils (see: <a href="http://www.soes.soton.ac.uk/staff/tt/eh/pics/lith2.gif" rel="nofollow">www.soes.soton.ac.uk/staff/tt/eh/pics/lith2.gif</a>). Coccoliths are individual calcareous plates that covered a single-celled, photosynthesizing marine organism called a coccolithophorid (a.k.a. coccolithophore; "coccolithophorid" is not an adjective, contra Wikipedia) (see: <a href="https://upload.wikimedia.org/wikipedia/commons/d/d9/Emiliania_huxleyi_coccolithophore_(PLoS).png" rel="nofollow">upload.wikimedia.org/wikipedia/commons/d/d9/Emiliania_hux...</a>).
Most chalks are Cretaceous in age ("creta" means "chalk"). The most famous example is the White Cliffs of Dover, along the southern shore of Britain.
Weathered chalks in western Kansas range in color from white to pale yellowish to pale grayish.
Stratigraphy: Smoky Hill Chalk Member (a.k.a. Smoky Hills Member), Niobrara Formation, Upper Cretaceous
Locality: Castle Rock & adjacent bluffs, north of Gove County Road K & east of Castle Rock Road, 23 kilometers south-southeast of the town of Quinter, eastern Gove County, western Kansas, USA
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
https://creativecommons.org/licenses/by/2.0CC BY 2.0 Creative Commons Attribution 2.0 truetrue