Types of fossils, Biology





Mode of formation




Wooly mammoths, 25,000 years

old, ice in Siberia, mummies, insect.

Whole bodies are found frozen in ice.


Altered or

petrified fossils

Bones, shell, teeth, wood etc.

Replacement of organic parts by mineral

deposits is called petrification.



Coenozoic mammals

Faecal pellets buried in sediments.


Moulds and


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.



Archaeopteryx feather, leaf

Remains in fine grained sediments on

which organisms died.



Dinosaur footprints, prints of leaf,

skin, wing etc.

Footprint trails, tract of





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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