GEOL 1003 Chapter : GEOL 1003 3
Document Summary
Fossils: what are fossils, tangible remains or signs of ancient organisms that died thousands or millions of years ago, hard parts. E. g. internal/external skeletons of invertebrate animals: soft parts- fleshy part", rarely preserved, especially in older rocks, one deposit famous for preservation of soft fossil is messel. Taxonomic groups: taxonomy= study of composition and relationship of the taxonomic groups, ways to separate all life forms into 2 groups, prokaryotes v eukaryotes, pro= cell lack certain internal structures (e. g. nucleus w/ genetic material) All are unicellular: eu= cells contain a nucleus and organelles. Some have left important fossil record- stromalite, extends back more than 3 ga: protist, unicellular. Dinoflagellate: dormancy in cyst under unfavorable condition, active in favorable conditions, cyst may be buried in sediment. Diatons: silica skeleton (sio2, sink, buried -> chert. Coccoliths: calcium carbonate shell (caco3, sink, buried -> chalk, simple multicellular.
