Micraster chalk is composed of fossilized remains of which organisms?

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Multiple Choice

Micraster chalk is composed of fossilized remains of which organisms?

Explanation:
Fossilized sea urchins are the main component of Micraster chalk. Micraster refers to a heart-shaped echinoid, and these irregular sea urchins lived on the seafloor in ancient shallow seas. When they died, their tests settled and accumulated, becoming the dominant fossils in this chalk, which is why the rock is so rich in echinoid remains. Ammonites, belemnites, and crabs can occur in chalk, but they do not define the bulk of the material the way sea urchin fossils do in Micraster chalk.

Fossilized sea urchins are the main component of Micraster chalk. Micraster refers to a heart-shaped echinoid, and these irregular sea urchins lived on the seafloor in ancient shallow seas. When they died, their tests settled and accumulated, becoming the dominant fossils in this chalk, which is why the rock is so rich in echinoid remains. Ammonites, belemnites, and crabs can occur in chalk, but they do not define the bulk of the material the way sea urchin fossils do in Micraster chalk.

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