![File:Chalk ("Upper Chalk" Formation, Upper Cretaceous; White Cliffs of Dover, England, southern Britain).jpg - Wikimedia Commons File:Chalk ("Upper Chalk" Formation, Upper Cretaceous; White Cliffs of Dover, England, southern Britain).jpg - Wikimedia Commons](https://upload.wikimedia.org/wikipedia/commons/5/52/Chalk_%28%22Upper_Chalk%22_Formation%2C_Upper_Cretaceous%3B_White_Cliffs_of_Dover%2C_England%2C_southern_Britain%29.jpg)
File:Chalk ("Upper Chalk" Formation, Upper Cretaceous; White Cliffs of Dover, England, southern Britain).jpg - Wikimedia Commons
![Hand drawn latin chalk vintage alphabet, set of black upper-case capital letters, isolated on blackboard background. Stock-Vektorgrafik | Adobe Stock Hand drawn latin chalk vintage alphabet, set of black upper-case capital letters, isolated on blackboard background. Stock-Vektorgrafik | Adobe Stock](https://as2.ftcdn.net/v2/jpg/01/64/29/79/1000_F_164297965_9wj2BzbvdCNzDEt4aJpPFhAXGokiUKFU.jpg)
Hand drawn latin chalk vintage alphabet, set of black upper-case capital letters, isolated on blackboard background. Stock-Vektorgrafik | Adobe Stock
![Upper Cretaceous Chalk outcrop from Selwicks Bay, Flamborough Head, UK... | Download Scientific Diagram Upper Cretaceous Chalk outcrop from Selwicks Bay, Flamborough Head, UK... | Download Scientific Diagram](https://www.researchgate.net/publication/324876102/figure/fig2/AS:621537979817986@1525197610812/Upper-Cretaceous-Chalk-outcrop-from-Selwicks-Bay-Flamborough-Head-UK-Starmer-1995.png)
Upper Cretaceous Chalk outcrop from Selwicks Bay, Flamborough Head, UK... | Download Scientific Diagram
![Upper Cretaceous chalk at Hvideklint. Note the occurrence of nodular... | Download Scientific Diagram Upper Cretaceous chalk at Hvideklint. Note the occurrence of nodular... | Download Scientific Diagram](https://www.researchgate.net/publication/357042445/figure/fig3/AS:1101127110135810@1639540569539/Upper-Cretaceous-chalk-at-Hvideklint-Note-the-occurrence-of-nodular-flint-in-the-chalk.png)
Upper Cretaceous chalk at Hvideklint. Note the occurrence of nodular... | Download Scientific Diagram
![1913 Upper Cretaceous Fossils Chalk Original Antique Print Geology Mounted and Matted Available Framed - Etsy 1913 Upper Cretaceous Fossils Chalk Original Antique Print Geology Mounted and Matted Available Framed - Etsy](https://i.etsystatic.com/11246694/r/il/dc54f8/2504485078/il_570xN.2504485078_tntn.jpg)
1913 Upper Cretaceous Fossils Chalk Original Antique Print Geology Mounted and Matted Available Framed - Etsy
The Ammonoidea of the Upper Chalk. Part 2: Monograph of the Palaeontographical Society The Ammonoidea of the Upper Chalk: Monographs of the Palaeontographical Society: Vol 174, No 656
![The Chalk Group (Upper Cretaceous) of the Northern Province, eastern England – a review | Proceedings of the Yorkshire Geological Society The Chalk Group (Upper Cretaceous) of the Northern Province, eastern England – a review | Proceedings of the Yorkshire Geological Society](https://www.lyellcollection.org/cms/10.1144/pygs2017-010/asset/d05d2e1f-e10e-42b3-86ee-22713c3b5b45/assets/images/large/pygs2017-010.01.jpg)