Question

Distinguish between the following:

Calcarious and Carbonacious rocks.

Answer 1

Calcarious rocks	Carbonacious rocks
The sedimentary rocks formed by the deposition of shells and skeletons of sea organisms, such as corals, clams, oysters, etc., are called calcareous rocks due to the excess of calcium.	The sedimentary rocks formed by the deposition of large-scale vegetation and animals, etc., are called carbonaceous rocks due to the excess of carbon.
Formed mainly from calcium carbonate.	Formed mainly from carbon-rich plant remains.
Made from shells and skeletons of marine organisms.	Made from accumulated, compacted plant material.
Examples: Limestone, Chalk.	Examples: Peat, Lignite, Bituminous coal, Anthracite.