nFossils of microscopic, soft-bodied, single-celled organisms, such as bacteria and algae in Precambrian rocks
nNo fossilized ancestors for any Cambrian invertebrate
nNo trace of transitional forms between the various kinds of invertebrates, e.g.
nNo linking sponges with jellyfish
nNo linking snails with trilobites
nFossils of a vast array of complex invertebrates abruptly appear fully formed in the Cambrian rocks