All the fossils collected were soft-bodied animals and their tissues were strengthened by spicules-needles of calcium carbonate that functioned as their support. The Ediacaran organisms were marine animals, some crawled, some were attached to the sea floor and others would swim or just freely float. Their impressions were molded in the moving sands that washed over the mud flats and were preserved as casts in the sandstone. It is difficult to conceive how fossils of delicate soft-bodied animals could be preserved given the evidence of strong currents in the strata. However, extensive research has provided an explanation.
Encyclopedia Britannica Online. Encyclopedia Britannica, n.d. Web. 02 Mar. 2014. .
Like other turtles, sea turtles lack teeth. Jaw shape varies among species. Each species has a jaw shape adapted for its diet. Sea turtles, depending on the species, may eat seagrasses, algae, sponges, sea squirts, squid, shrimp, crabs, jellyfish, cuttlefish or sea cucumbers. Leatherbacks can dive to a depth of more than 1,000 meters (3,000 feet) in search of their prey, jellyfish.