GEOL 1020 Lecture Notes - Lecture 24: Depositional Environment, Agnatha, Symmetry In Biology
7 Dec 2017
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Dramatic increase in diversity of life in the oceans at the beginning of the cambrian period (first period in the. Most major animal groups first appeared in the fossil record during the. Ex: corals, echinoderms, molluscs, arthropods (means jointed leg/foot), and vertebrates appeared in the cambrian. What evidence in the rock/fossil record would you expect to see that would suggest a sudden appearance of diverse marine animals on earth in the early. Presence of limestone (since it has marine critters in its makeup), potentially a lot of fossils if they had hard parts, trace fossils (burrows, etc). The base of the cambrian system is defined by the first appearance of the trace fossil trepichnus pedum. This shows more activity at the beginning of the cambrian period. We don"t know who made this trace fossil, but it still gets a taxonomic name. This shows an increase in diversity and complexity of trace fossils in the cambrian.
