Which type of rock is abundant in older rock formations but more rare in newer formations, may contain oil or gas, and is formed by a reaction with a previous sedimentary rock?

Question

Quizplus · Accepted Answer

Dolostone is a type of sedimentary rock that is abundant in older rock formations but less common in newer ones. It is often associated with oil and gas deposits and forms when a previous sedimentary rock undergoes a chemical reaction, primarily in a marine environment. Anthracite and bituminous coal are types of organic sedimentary rocks and chert is a non-organic sedimentary rock, none of which fit the given description.

Which Type of Rock Is Abundant in Older Rock Formations