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8. Which of the following are reasons why Index fossils are chosen for determining ages of rocks? Select all that apply .
A Found commonly in rocks
B. Distributed over a very wide range
C. Are always dinosaurs
D. Limited life existence in geologic time.

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quasarJose

Answer:

B. Distributed over a very wide range

D. Limited life existence in geologic time.

Explanation:

Index fossils are very unique fossils that helps in determining the relative ages of rocks and biostratigraphic correlation. They are usually called guide fossils.

  • Fossils are the preserved remains of dead organisms found in rocks.
  • Index fossils are a special class of fossils with the following properties;
  1. They are widely distributed.
  2. They have a short stratigraphic range.
  3. They show rapid evolution trends

Answer:

d and b

Explanation: