GEOLOGY
STRATIGRAPHY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Dinosaur bones found only in Australia.
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Footprints of different types of dinosaurs.
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Casts of bird feathers found in all layers of rock in an area.
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Corals found in rock layers worldwide.
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Detailed explanation-1: -Some of the most common index fossils are ammonites, trilobites, and graptolites.
Detailed explanation-2: -Trilobites are considered a very good index fossil because they were mobile animals and tended to inhabit large, even global areas during the Paleozoic Era. Trilobites were also hard-shelled invertebrates, so they fossilized easily.
Detailed explanation-3: -Index fossils are found chiefly in sedimentary rocks. They are an essential tool in stratigraphy for comparing the geological ages of sedimentary rock formations. Examples are ammonites and graptolites.
Detailed explanation-4: -Certain fossils, such as ammonites, trilobites and graptolites, are known as index fossils. Because they were so abundant and widespread during a short period of geological time, their presence helps date rocks from that period.