GEO 303 Lecture Notes - Lecture 6: Laurie Duncan, Cladistics, Chordate
21 Dec 2017
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Paleontology: study of the geologic history of life. Trace fossil: evidence of an organism"s behavior or activity (ex. footprint, coprolite, glauconite, The remains of all or part of an organism (ex. dino bone mold, petrified wood) gizzard stones) processes of fossilization. The ammonite lives, then dies and its soft tissue rots. (iii) making a mold; (iv) making a cast. Without alteration: ex. insects in amber, frozen mammoth, vertebrate bones. Original molecules replaced on an atom-by-atom scale (ex. petrified wood) Mold: fossil impression of original morphology of the inside or outside of organism (or its trace) Cast: fossil formed by filling or surrounding a mold. Consider the following series of events. Or, (ii) the shell dissolves, and the cavity is filled with mud, which hardens, producing a cast. or, (iii) mud fills the inside of the shell, and hardens. Later, the shell dissolves leaving an internal mold, or steinkern (german: result. paleontology and fossils symmetry and body plans corals.
