PLZZ HELP 20 POINTS Scientists found two ammonite fossils in rock layers far across the ocean floor from each other. Ammonite existed during a brief period of time. Knowing this, answer the following questions:

BLANK 1: What type of fossils would ammonites be considered?

BLANK 2: What could scientists infer about the rock layers containing the fossils?

BLANK 3: If a new fossil was found in the layer beneath the ammonites, what would you automatically know about that fossil?