Fossils in very old sediment deposits show complex animal groups predate the Cambrian. Ediacaran species, cnidarians, ctenophores, and mackenziids are among the finds. A worm-like fossil with left-right symmetry indicates early bilaterians.
Ctenophores, resembling modern comb jellies, also found, suggesting earlier origins of these features. Fossils include potential muscle fibers, challenging previous understanding of early life diversity.