EESA06H3 Lecture 8: LEC 08
Document Summary
Lec 08: feb 29, 2016 geologic time. Stratigraphy: study of how the rocks are arranged in time: the branch of geology concerned with the order and relative position of strata and their relationship to the geological time scale. Relative age vs absolute age: absolute is exact age, can be done with chemical aging systems, relative is based on mapping of rock layers, seeing which rocks are older than others. Conformable succession: when the layers of rock sit on each other without any major breaks. Unconformable succession: when the layers of rock sit on each other with incomplete gaps (more common) Succession: is the observed process of change in the species structure of an ecological community over time. Index fossils and faunal succession: faunal succession: succession of fossil types that show evolution. Law of faunal succession: index fossils: organisms that evolve very quickly. Used to identify relative age of strata and gaps (disconformities)
