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Geol 1404 Ch 10
Test 3
| Question | Answer |
|---|---|
| Each of the major continents at the beginning of the Paleozoic can be divided into two major components: | a craton and a mobile belt |
| The craton can be subdivided into: | a shield and a platform |
| The Michigan Basin is an important source for: | anhydrite and gypsum |
| Rocks of the shield are primarily | igenous |
| Which of the following was NOT a mobile belt affecting the North American continent during the Early Paleozoic: a. franklin c. cordilleran c. hercynian d. ouchita e. appalachian | c. hercynian |
| Areas of elongate mountain building activity are called | mobile belts |
| During the Cambrian, most of the continents were: | dispersed in low latitude regions |
| Plate mvmnt in the Ordovician and Silurian resulted in: a. mvmt of Gondwana to a south polar region b. dvlpmnt of an active eastern margin on Laurentia c. collision of Baltica and Laurentia d. Siberia and Kazakhstania migrating the north temperate reg | all of the above |
| In the Cambrian, the major event for the North American continent was | epeiric seas transgression and regression |
| Global transgressive and regressive cycles can be caused by | major tectonic events and major glacial events ( A and D ) |
| Sequence straigraphy is based on | time-stratigraphic boundaries to related units |
| Linestom structures made of teh skeletal structures of living organisms are | organic reefs |
| Organic reefs are useful paleoecological indicators because modern reef builders online | 1. form limestone reefs in warm, clear, shallow water 2. form limestone reefs between 30 degrees north and south of the equator (C and D) |
| Reefs typically form | linear masses that separate a shallow platform from deep marine environment |
| Reefs first appeared in the geologic record in great abundance during the | Cambrian |
| All of the following played a role in dvlpmnt of thick evaporite sqnce in reef-fringed basins EXCEPT: a. rise in sea level after reef frmtn b. upward growth of the reef c. drop in sea level after reef formation d. evaporation e. restriction of circul | A. rise in sea level after reef formation |
| The Tippecanoe Sea had retreated to the craton margin by the | Early Devonian |
| The onset of mountain building in the Appalachian mobile belt is characterized by all of the following except: a. platform carbonate deposition b. thin bedded black shales c. coarse sandstones d. grawackes e. volcanic rocks | c. coarse sandstones |
| All but which are examples of early Paleozoic mineral deposits: a. silica sand b. rock salt and anhydrite c. lead and zinc d. iron e. chromite | E. Chromite |
| The basal unit of the Tippecanoe sequence is an important source for | silica sand |
| The Silurian Clinton Formation is an important source for | Iron |
| lead and zinc deposits in Missouri are found in Paleozoic rocks of this period: | Cambrian and Orodovician |
| The first mountain building episode of the Appalachians was the: | Taconic orogeny |
| The basin within the Tippecanoe Sequence in which evaporites precipitated is the | Michigan |
Created by:
SarahElaine
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