Abundance of marine invertebrates; first trilobites and foraminifers. That's what lives on the floor of the ocean. That's why it's at the bottom of the stratigraphic column.
Abundance of marine invertebrates
August 4th
The Bible says that there was a world-wide flood, but failed science (SciPop) insists that there's no evidence of it. A world-wide flood would leave evidence, so where is it? It's the world-wide distribution of sedimentary rock.