EPSC 201 Lecture Notes - Lecture 6: Stratigraphic Column, Oogenesis, Stata
20 Jul 2016
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Document Summary
A time period is recognized by its fossil content: relative age: conformities and unconformities o sediments in the ocean generally accumulate without interruption for millions or o tens of millions of years conformable. An angular unconformity represents a huge gulf in time: horizontal marine sediments deformed by oogenesis, mountains eroded completely away, renewed marine invasion, new sediments deposited. o nonconformity igneous/metamorphic rocks capped by sedimentary rocks. Often hard to recognize: a stratigraphic column describes the sequence of strata. o formations can be traced over long distances. o contacts define boundaries between formations or beds. o several formations may be combined as a group, to develop a geological calendar that is applicable to the whole earth, rocks of similar age in different regions must be matched up stratigraphic correlation. o stratigraphic correlation: determination of equivalence, in geological age and o position, of the succession of stata found in two or more different areas.
