EARTHSC 1G03 Lecture Notes - Erosion Surface, Principle Of Faunal Succession, Absolute Dating
21 Mar 2013
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Document Summary
Geologic processes and natural laws from the past are those observed or inferred from observations as operating at present: physical laws are independent of time and location. Geologists follow actualism which encompasses sudden geological events. Sequence of events without reference to the age in years. Identifies characteristic formations: map-able rock units with distinctive mineralogical, structural, or textural characteristics. Contacts are used for deciphering time; contacts are surfaces separating two different rock types or rocks of diff. ages. Beds of sediment deposited in water originally formed as horizontal layers. Geologic event tilting of bed rock occurs after (after deposition) In a sequence of sedimentary or volcanic rock layers, the layers are oldest near the bottom and youngest near the top. Original sedimentary layer extends laterally until it tapers or thins at edges. A disrupted pattern is older than the cause of disruption (intrusion or fault) Correlate local formations with those of other regions.
