Classify the sedimentary rocks on the basis of mode of formation.

Explanation

Depending upon the mode of formation, sedimentary rocks are classified into three major groups:
(i) Mechanically formed: Some of its examples are sandstone, conglomerate, limestone, shale, loess, etc.
(ii) Organically formed: Some of its examples are geyserite, chalk, limestone, coal, etc.

(iii) Chemically formed: Some of its examples are chert, limestone, halite, potash, etc.