TYPES OF FOSSILS -

S.No.	Fossil	Example	Mode of formation
1	Unaltered (Preservation)	Wooly mammoths, 25,000 years old, ice in Siberia, mummies, insect.	Whole bodies are found frozen in ice.
2	Altered or petrified fossils	Bones, shell, teeth, wood etc.	Replacement of organic parts by mineral deposits is called petrification.
3	Coprolite	Coenozoic mammals	Faecal pellets buried in sediments.
4	Moulds and Casts	Gastropods (Mullusca) from Portland	Moulds of hardened and fossilized mud that surround an extinct individual, the burried individuals have been completely destroyed but the moulds retained true copies of their shape.
5	Impressions	Archaeopteryx feather, leaf	Remains in fine grained sediments on which organisms died.
6	Imprints	Dinosaur footprints, prints of leaf, skin, wing etc.	Footprint trails, tract of organism.
7	Compression	Plants	Main tissues part disappears and only the outer tough parts remains intact covering into rock.

Posted Date: 10/8/2012 8:59:04 AM | Location : United States

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