![File:Uintacrinus socialis fossil crinoids in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 7 (15115688847).jpg - Wikimedia Commons File:Uintacrinus socialis fossil crinoids in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 7 (15115688847).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/0/02/Uintacrinus_socialis_fossil_crinoids_in_chalk_%28Niobrara_Formation%2C_Upper_Cretaceous%3B_western_Kansas%2C_USA%29_7_%2815115688847%29.jpg)
File:Uintacrinus socialis fossil crinoids in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 7 (15115688847).jpg - Wikimedia Commons
![Fossil brachiopod of the genus Inoceramus from the chalk (Cretaceous) at Cow Gap, near Eastbourne, East Sussex Stock Photo - Alamy Fossil brachiopod of the genus Inoceramus from the chalk (Cretaceous) at Cow Gap, near Eastbourne, East Sussex Stock Photo - Alamy](https://c8.alamy.com/comp/E7HAAY/fossil-brachiopod-of-the-genus-inoceramus-from-the-chalk-cretaceous-E7HAAY.jpg)
Fossil brachiopod of the genus Inoceramus from the chalk (Cretaceous) at Cow Gap, near Eastbourne, East Sussex Stock Photo - Alamy
![Chalk Sea Fossil, Sourced in Nospel Luxembourg, Ancient Shellfish Fossil Europe, Geological Found Europe - Etsy Israel Chalk Sea Fossil, Sourced in Nospel Luxembourg, Ancient Shellfish Fossil Europe, Geological Found Europe - Etsy Israel](https://i.etsystatic.com/15342872/r/il/878d47/4325232664/il_570xN.4325232664_1x4g.jpg)
Chalk Sea Fossil, Sourced in Nospel Luxembourg, Ancient Shellfish Fossil Europe, Geological Found Europe - Etsy Israel
![File:Uintacrinus socialis fossil crinoids in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 9 (15115469629).jpg - Wikimedia Commons File:Uintacrinus socialis fossil crinoids in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 9 (15115469629).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/e/ea/Uintacrinus_socialis_fossil_crinoids_in_chalk_%28Niobrara_Formation%2C_Upper_Cretaceous%3B_western_Kansas%2C_USA%29_9_%2815115469629%29.jpg)
File:Uintacrinus socialis fossil crinoids in chalk (Niobrara Formation, Upper Cretaceous; western Kansas, USA) 9 (15115469629).jpg - Wikimedia Commons
![Wooster's Fossils of the Week: Trace fossils making ghostly shells (Upper Cretaceous of Mississippi) | Wooster Geologists Wooster's Fossils of the Week: Trace fossils making ghostly shells (Upper Cretaceous of Mississippi) | Wooster Geologists](http://woostergeologists.scotblogs.wooster.edu/files/2013/12/Entobia-bivalve-1-exterior-Prairie-Bluff-Chalk-Formation.jpg)
Wooster's Fossils of the Week: Trace fossils making ghostly shells (Upper Cretaceous of Mississippi) | Wooster Geologists
![Fossil? Saw this while on a hiking trail and picked it up. The location is in White Cliffs arkansas. These cliffs are made of Annona chalk. : r/fossilid Fossil? Saw this while on a hiking trail and picked it up. The location is in White Cliffs arkansas. These cliffs are made of Annona chalk. : r/fossilid](https://i.redd.it/4z2htpkcwmgb1.jpg)
Fossil? Saw this while on a hiking trail and picked it up. The location is in White Cliffs arkansas. These cliffs are made of Annona chalk. : r/fossilid
![15" Cretaceous Cimolichthys Skull & Vertebrae - Niobrara Chalk, Kansas (#62787) For Sale - FossilEra.com 15" Cretaceous Cimolichthys Skull & Vertebrae - Niobrara Chalk, Kansas (#62787) For Sale - FossilEra.com](https://assets0.fossilera.com/sp/200513/kansas/cimolichthys-nepaholica.jpg)