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File:Chalk (Annona Chalk, Upper Cretaceous; White Cliffs of the Little River, Arkansas, USA) (40795385595).jpg - Wikimedia Commons
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File:Chalk ("Upper Chalk" Formation, Upper Cretaceous; White Cliffs of Dover, England, southern Britain).jpg - Wikimedia Commons
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1913 Upper Cretaceous Fossils Chalk Original Antique Print Geology Mounted and Matted Available Framed - Etsy
![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)
The Chalk Group (Upper Cretaceous) of the Northern Province, eastern England – a review | Proceedings of the Yorkshire Geological Society
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
![Hand drawn chalk board alphabet font. Upper and lower case letters and numbers on a distressed background. Retro vector typeface for your design. Stock-Vektorgrafik | Adobe Stock Hand drawn chalk board alphabet font. Upper and lower case letters and numbers on a distressed background. Retro vector typeface for your design. Stock-Vektorgrafik | Adobe Stock](https://as1.ftcdn.net/v2/jpg/01/64/74/12/1000_F_164741262_XP00FHcWgCDCKLHXDX91ZwLhpTaP2rVP.jpg)
Hand drawn chalk board alphabet font. Upper and lower case letters and numbers on a distressed background. Retro vector typeface for your design. Stock-Vektorgrafik | Adobe Stock
![PDF] A stratigraphical framework for the Upper Cretaceous Chalk of England and Scotland with statements on the Chalk of Northern Ireland and the UK offshore sector | Semantic Scholar PDF] A stratigraphical framework for the Upper Cretaceous Chalk of England and Scotland with statements on the Chalk of Northern Ireland and the UK offshore sector | Semantic Scholar](https://d3i71xaburhd42.cloudfront.net/9846498755aef24e84ac96cbcf5e164e6ea9431a/14-Figure1-1.png)