Question

the richest source of fossil basal,granite,lava,sedimentary

Answer 1

HEY USER,
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The richest source of Fossil are the sedimentary rocks.
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Thanks for the question.

Answer 2

The correct answer is Sedimentary rocks.

The main reason behind this is the way of formation of sedimentary rocks. Layer by layer deposition of soil particle under water bodies like rivers traps the in-between living or dead organisms. When enough layer is formed over the layer in which it got trapped, the pressure is so increased that the soil turns into solid rock material, and the mark of the dead organism stays on the rock between layers.