SIR C R REDDY (A) COLLEGE DEPARTMENT OF GEOLOGY SK.MEERJAVALI III-B.Sc (2016-17)

FOSSILS The remains of ancient animals and plants preserved in the rocks Latin word – fossilus – dugup Fossils available in sedimentary rocks Different fossils having different composition

Types of fossils Fossils of entire organism is preserved Only skeleton is preserved Carbonation as hard parts Petrifaction as hard parts Mould of skeleton Imprints

Fossils of entire organism preserved along soft parts It is a rare &cold conditions The entire animal is preserved Along with very little change is also preserved

Only skeleton is preserved It is the condition of fossilisation in which the skeleton is completely preserved Soft parts are destroyed and hard parts are preserved

Carbonation of hard parts Marine life will change into carbon also some plants and small organisms like graptolites will change into carbon material

Petrifaction of hard parts Hard parts of the ancient animals or plants are petrified The petrified or mineralised parts bring into petrifaction

Mould of the skeleton Fossilisation is along process and in some cases the skeleton is disappears The shape of the original structure is preserved in the rocks