In a series of rock layers a geologist finds fossilized shellfish and bony fish in layers that are 1.0 m and 1.5 m deep. However, in a layer that is 2.0 m deep, he finds fossils of a lizard-like dinosaur and a fern-like tree.

Which explains his findings?

AThe continent shifted to a polar region

BThe ancient sea dried up and became land

CAn astroid hit the area, causing the dinosaurs to become extinct

DThe ancient land area was invaded by the sea

Thankyou for your time!