If a fossil is at the bottom of a rock layer, it is generally:

If a fossil is at the bottom of a rock layer, it is generally:

• A. Old
• B. New
• C. It Depends on the Rock Type
• D. Cannot Determine

Answer: (A)

Fossils found lower in a sequence of sedimentary rock are generally older because layers form over time with newer material piling on top of older material. This idea, often called the law of superposition, means the deepest fossils started their history first, and the ones higher up came later. So a fossil at the bottom is usually older than ones above it. Disturbances can change the order in some cases, but in a normally deposited sequence, the bottom fossil represents the earlier time.

Fossils found lower in a sequence of sedimentary rock are generally older because layers form over time with newer material piling on top of older material. This idea, often called the law of superposition, means the deepest fossils started their history first, and the ones higher up came later. So a fossil at the bottom is usually older than ones above it. Disturbances can change the order in some cases, but in a normally deposited sequence, the bottom fossil represents the earlier time.