Sentences with phrase «by shell fragments»
Not exact matches
Two meters (six and a half feet) below the surface he encountered a layer of sediment marked by coral fragments, mollusk shells and coarse beach sand that could only have come from the sea.
https://www.sciencedaily.com/
As they analyzed a pair of 66 - to 100 - million - year - old plesiosaur skeletons found near Hokkaido, Japan, the researchers realized the fossilized bones of the toothy, quad - flippered marine reptiles * were surrounded by fossilized shell fragments from provannids, a type of tiny snail.