TYPES OF FOSSILS -
Mode of formation
Wooly mammoths, 25,000 years
old, ice in Siberia, mummies, insect.
Whole bodies are found frozen in ice.
Bones, shell, teeth, wood etc.
Replacement of organic parts by mineral
deposits is called petrification.
Faecal pellets buried in sediments.
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.