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" data-medium-file="https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/chalk-biological-limestone-300x232.jpg" data-large-file="https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/chalk-biological-limestone-1024x791.jpg" loading="lazy" width="1024" height="791" src="https://i2.wp.com/lifwynnfoundation.org/wp-content/uploads/2019/05/chalk-biological-limestone.jpg?fit=640%2C494" alt="" data-id="3323" data-link="https://lifwynnfoundation.org/?attachment_id=3323" class="wp-image-3323" srcset="https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/chalk-biological-limestone.jpg 1024w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/chalk-biological-limestone-300x232.jpg 300w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/chalk-biological-limestone-768x593.jpg 768w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/chalk-biological-limestone-544x420.jpg 544w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/chalk-biological-limestone-640x495.jpg 640w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/chalk-biological-limestone-681x526.jpg 681w" sizes="(max-width: 1024px) 100vw, 1024px" />chalk
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" data-image-caption="Eisco Chalk Limestone Specimen

" data-medium-file="https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen-300x194.jpg" data-large-file="https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen-1024x664.jpg" loading="lazy" width="1024" height="664" src="https://i2.wp.com/lifwynnfoundation.org/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen.jpg?fit=640%2C415" alt="" data-id="3325" data-link="https://lifwynnfoundation.org/?attachment_id=3325" class="wp-image-3325" srcset="https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen.jpg 1024w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen-300x194.jpg 300w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen-768x498.jpg 768w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen-648x420.jpg 648w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen-341x220.jpg 341w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen-640x415.jpg 640w, https://secureservercdn.net/160.153.137.170/xjn.93b.myftpupload.com/wp-content/uploads/2019/05/Eisco-Chalk-Limestone-Specimen-681x441.jpg 681w" sizes="(max-width: 1024px) 100vw, 1024px" />pure limestone chalk rock

Chalk is a non-clastic carbonate sedimentary rock that is form of limestone compesed of the mineral calcite. It is soft, fine-grained and easily pulverized. Color is white-to-grayish variety of limestone rock. It is composed of the shells of such minute marine organisms as foraminifera, coccoliths, and rhabdoliths. The purest varieties contain up to 99 percent calcium carbonate in the form of the mineral calcite. The sponge spicules, diatom and radiolarian tests (shells), detrital grains of quartz, and chert nodules (flint) found in chalk contribute small amounts of silica to its composition. Small proportions of clay minerals, glauconite, and calcium phosphate also are present.

It has greater resistance to weathering and slumping than the clays with which it is usually associated, thus forming tall, steep cliffs where chalk ridges meet the sea.


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Chalk hills, known as chalk downland, usually form where bands of chalk reach the surface at an angle, so forming a scarp slope. Because chalk is well jointed it can hold a large volume of ground water, providing a natural reservoir that releases water slowly through dry seasons.