In what type of rock are fossils most likely to be found : Igneous, Metamorphic or Sedimentary ?

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted on

Fossils are formed when the body of a living organism that has died is covered and protected from decay by microorganisms and attacks by predators.

Usually fossils are formed when a layer of sediment covers dead plants, animals and microorganisms. This makes sedimentary rocks like limestone and shale the best in the formation of fossils.

Igneous rocks are formed directly from hot lava and would not be able to preserve any remnants of living organisms that fall in it during its formation. Metamorphic rocks also undergo a lot of change under extreme conditions which make the chance of fossils being created in them very less.

A majority of fossils are found in sedimentary rocks.

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M.P. Ossa | College Teacher | (Level 1) Distinguished Educator

Posted on

Fossils are more likely to be found in sedimentary rock and here are the reasons why.

Contrary to igneous and metamorphic rocks, sedimentary rocks do not change. Their name itself indicates that they pretty much have remained in the same place and state for centuries.

In the same line of thought, igneous rocks often are remains of volcanic eruptions or have been transformed by heart and erosion. Metamorphic rocks are like igneous rocks in that they have mixed with other rocks, have been crushed and mixed and also have been affected by extreme temperatures.

Therefore sedimentary rocks, either because of their location and the fact that they do not come from any volcanic activity, are more likely to remain the same and therefore whatever fossil that will be imprinted in it will undoubtedly do it easier in such a type of unchanging rock.

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rad23 | eNotes Newbie

Posted on

in what type of areas and rock layers is metamorphic most likely found

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