ملف:Chalk badlands (Niobrara Formation, Upper Cretaceous; chalk bluffs south of Castle Rock, Gove County, Kansas, USA) 7 (38417957134).jpg
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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. The rhythmic layering seen here is likely the result of Milankovitch cyclicity (see: <a href="https://en.wikipedia.org/wiki/Milankovitch_cycles" rel="nofollow">en.wikipedia.org/wiki/Milankovitch_cycles</a> and <a href="https://en.wikibooks.org/wiki/Historical_Geology/Milankovitch_cycles" rel="nofollow">en.wikibooks.org/wiki/Historical_Geology/Milankovitch_cycles</a>). Stratigraphy: Smoky Hill Chalk Member (a.k.a. Smoky Hills Member), Niobrara Formation, Upper Cretaceous Locality: bluffs adjacent to Castle Rock, 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 |
| ⧼wm-license-information-date⧽ | 2013, {{time}} – invalid date format 08 (help) |
| ⧼wm-license-information-source⧽ | Chalk badlands (Niobrara Formation, Upper Cretaceous; chalk bluffs south of Castle Rock, Gove County, Kansas, USA) 7 |
| ⧼wm-license-information-author⧽ | James St. John |
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| زمن/تاريخ | صورة مصغرة | الأبعاد | مستخدم | تعليق | |
|---|---|---|---|---|---|
| حالي | ★ مراجعة معتمدة 23:08، 19 نوفمبر 2023 | | 4٬278 × 2٬451 (4٫57 ميجابايت) | Pastakhov (نقاش | مساهمات) | Upload https://upload.wikimedia.org/wikipedia/commons/4/4b/Chalk_badlands_%28Niobrara_Formation%2C_Upper_Cretaceous%3B_chalk_bluffs_south_of_Castle_Rock%2C_Gove_County%2C_Kansas%2C_USA%29_7_%2838417957134%29.jpg |
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