GEOL 102 Study Guide - Midterm Guide: Tabulata, Ediacaran Biota, Ediacara Hills
Document Summary
Fox and harada- worked from amino acids found by miller and urey but subjected them to conditions meant to simulate underwater vents; yielded protein-like substances: successfully created protein-like substances and cell membrane like microspheres but still nothing alive. Australia; mostly soft parts and required exceptional preservation to fossilize. From all continents except antarctica: could be related to: Lecture 17: ordovician era: terrane- a geologically distinct region of earth"s crust that has behaved as a coherent crustal block, ordovician radiation- largest increase in diversity of lifeforms, mollusca, hemichordata, cnidaria, porifera, bryozoa, echinodermata, brachiopoda, arthropoda, chrodata, vertebrates. Dermal (small scales covering their whole bodies that are similar in shape and comp) origins:co-opted dermal scales which eventually became completely separate anatomical structures. Branchial arch (tooth like structures on pharyngeal arches) origins:when arches were co-opted as jaws, perhaps the teeth were too. Just low species richness; rapid appearance of derived forms at end of gap is suspicious.
