EAS210 Lecture Notes - Lecture 8: Dune, Nonconformist, Unconformity
30 Nov 2018
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Chapter 8, p. 183-203 earth: an introduction to physical geology 4ce: stratigraphic principles. Definition:- in an undisturbed sequence of strata, the oldest lie at the bottom, from nicolaus steno, 1669, denmark, come three principles: principle of superposition and become progressively younger toward the top, principle of original horizontality. Note a particular need: to determine tops , or right way up. Definition:- strata are formed or deposited as horizontal sheets or beds. Note exceptions on the smaller scale, such as: cross beds in dune deposits, reefs and reef talus, and delta forest beds: principle of lateral continuity. This principle actually applies to two different phenomena: Definition:- igneous intrusive rocks are always younger than the rocks they: intrusions intrude. [recognition of intrusive vs. extrusive character of igneous rocks can be important: faults. Definition:- faults are always younger than the rocks or features they displace.
