[DittoJed2]

Incidentally, if you are referring to layer, trilobites were sea creatures (interesting they are found in great numbers in Ohio) and Mammoths were land. Trilobites would naturally be at a bottom layer while mammoths would be higher up since the trilobite was already in the water.

[VadeRetro]

Incidentally, if you are referring to layer, trilobites were sea creatures (interesting they are found in great numbers in Ohio) and Mammoths were land. Trilobites would naturally be at a bottom layer while mammoths would be higher up since the trilobite was already in the water.

So all the marine-environment layers of the geologic column (that thing that doesn't exist) lie below all the land-environment layers?