Sediments, Bioturbation and Uniformitarianism
Here is another example of uniformitarian presuppositions being proven wrong, this time in the deep blue sea. The bioturbation of sediments by trace makers is often perceived by naturalists as a process requiring extensive periods of time. Little experimental work has been conducted to either support or refute such a concept. However, recent laboratory analysis indicates that the bioturbation of marine sediments can occur within short periods of time. Bioturbation experiments Marine worms, bivalves (clams), arthropods (shrimp and crabs), and echinoderms (sea urchins and brittle stars) are just some of the many animals that live on or in marine sediments (figures 1 and 2). The study of traces created in sediment is identified as ichnology (Gk ichnos = trace). Recently, an investigation was conducted to determine the rate that select bivalves, arthropods, and echinoderms could bioturbate marine sediments. The animals were collected from