The shallow ocean environments of the near shore and shore zones, where most of the limestone formed, are often referred to as "carbonate factories." The invertebrate organisms typical of these environments had shells or skeletons made of calcium carbonate, either in the form of the mineral calcite or its polymorph, ...

Where are carbonates mainly found?

Most modern, and probably most ancient, carbonates are predominantly shallow water (depths <10-20 m) deposits. This is because the organisms that produce carbonate are either photosynthetic or require the presence of photosynthetic organisms.

What is Wackestone in geology?

Wackestone is a type of limestone recognized in the Dunham (1962) Classification Scheme in which grains make up more than 10% of the rock but the grains are mud supported, i.e., the grains float in a mud matrix.