overview of stratigraphy depositional system

Aug 14th, 2016
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Basic Principles of Stratigraphy and Depositional SystemsI.INTRODUCTIONA.Stratigraphy: the study of the geologic rock record in the context ofgeologic time.1.Geologic Rock Record: analogous to a tape recording in whichsome historical events are preserved and recorded, others havebeen erased, and still others were not taped at alla.Referred to as "Stratigraphic Record": originally involvedthe study of "layered" sedimentary rocks and the fossilrecord.(1)2.Geologic Time: abstract concept of continuous linear time fromearth's origins to present day (portions of which are preserved in therock record, and portions of which are not)a.3.B.Time record vs. Rock RecordThe study of Stratigraphy represents an attempt to correlate therelative sequence of observations from the rock record, with that ofhistorical/linear time.Historical Geology: Use of the stratigraphic record to derive historical timerecord and physical/biological evolution of the earth.1.C.Advances in sensing techniques (radiometric dating,seismic analysis, paleomagnetism) have expandedthe study of stratigraphy and rock record to the realmof igneous and metamorphic rock sequencesI.e. examining the rock record to deduce the natural history of thetime record.Sedimentology: study of the processes and products of the near-surfaceenvironment of the earth1.Sedimentology outgrowth of stratigraphy, historical geologya.Stratigraphy originally based on layered sedimentary rock

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