Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: Scientists claim that the area around the Grand Canyon was once covered by an ocean. What evidence would support their claim?
Fossils of ocean animals were found at the Grand Canyon.
Fossilized marine life, sedimentary layers, and geological features such as shorelines and deltas.