Chalkstone
Chalk, also known as white clay, white clay, white soil, white, white, white, is a kind of amorphous limestone, mud limestone is not consolidated before the sample, was white, the main component of calcium carbonate, For the red algae fossil into the. The Cretaceous in the geological schedules is precisely because the famous Cretaceous strata in the UK are named after the representatives of this age. The main component of the tooth root part of the tooth is also chalky. ...