The third subgroup contains rocks with low to virtually no permeability and contains limestone, shale, clay and alevrolite content as well as the paleocen flysch-Neocene ( pgl-2 ) and mastrikcianit ( Crm2-PG2 ).
2.
These three periods are further split into seven sub-divisions, with the Paleogene composed of The Paleocene, Eocene, and Oligocene, the Neocene divided into the Miocene, Pliocene, and the Quaternary composed of the Pleistocene, and Holocene.
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