GEOL 1020 Final Study Guide

GEOL 1020 Final Study Guide - GEOLOGY FINAL STUDY GUIDE...

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GEOLOGY FINAL STUDY GUIDE Print hmwk #6: Rewrite Q’s 24 & 25-test lateral distribution of features assoc. with c/c conv, not o/c conv Understand chart: o Make lists of features found in each plate tectonic setting-explain WHY it occurs in that setting o Draw figures to show distribution across surface of earth of various features found in each setting Eastern US: make charts summarizing what, when, why, & geologic features indicating tectonic events happened --------------------------------------------------------------------------------------------------------------------------------------------------- ------------- Transgression : landward movement of shoreline Regression : seaward movement of shoreline How are they recognized in a vertical sequence of sedimentary rocks? o Transgression produces a vertical facies sequence indicative of Continental Shoreline marine [bottom to top] o Regression produces a vertical facies sequence indicative of “shallowing & emergence” Marine shoreline continental [bottom to top] What facies changes laterally would indicate a transgression or regression? o The lateral changes in facies mean lateral changes in environments through time o Facies patterns reflect T’s and R’s caused the lateral shift in environments on the earth surface Why do transgressions and regressions form? o Movement of shorelines and changing position of the sea Recognize evidence for a T or R in specific vertical sequence of facies, on cross section of facies, or on map of facies positions? o The evidence of shoreline or marine fossils is usually evidence of transgression o A disconformity is ALWAYS evidence of a regression What is the evidence for transgressions and regressions across the western US in the Cretaceous? o o The record of these T-R cycles is seen in the vertical and lateral distribution of sedimentary facies What is the evidence for 4 transgressions and regressions across the entire US in the Paleozoic? 1. Sauk 2. Tippacanoe 3. Kaskaskia 4. Absoraka o Must be something that caused sea level to rise and fall Glaciers due to climate change affects amount of water in sea Sea floor spreading affect size of ocean basin or the “TUB” --------------------------------------------------------------------------------------------------------------------------------------------------- ------------- Sea level change was the driver of transgressions and regressions in the Cretaceous period o distribution of Cretaceous sedimentary facies across the western US represent T’s and R’s o no faults of Cretaceous age cut the rocks eliminating tectonic activity as the reason for T’s and R’s o
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GEOL 1020 Final Study Guide - GEOLOGY FINAL STUDY GUIDE...

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