Earth Sciences 1083F/G Final: Earth Sci exam review final.pdf
6 Feb 2014
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>fossilization is rare, for dead remains to survive into fossil requires exceptional conditions. >scavenging: after and organism dies, its tissues are destroyed due to various factors. Macroscopic level: large scavengers take their soft tissue, small. Microbial decay: microbes break down organic matter further at molecular level, often decay from inside out, in animals-gut bac can jump start process scavengers take their share. >physical and chemical weathering: physical weathering mechanically breaks down hard, mineralized tissues (e. g. shells, bone, teeth); mineralized tissues also tend to dissolve(via chemical weathering), and erode, if exposed at the surface; physical- physical interaction; chemical- chemical interactions. >hard parts are preserved more often since they are more robust, more stable (chemically), and are more resist to destruction. >almost never preserved intact, soft tissue decay removes connective tissue keeping hardparts together. Fragmentation: breakage and dissociation of fragments thus formed. Dissolution: breakdown of hardparts via dissolutions of minerals in hardparts.
