1. In which Paleozoic period are evaporite deposits found that were apparently c
ID: 290827 • Letter: 1
Question
1. In which Paleozoic period are evaporite deposits found that were apparently caused by coral reefs restricting oceanic circulation
A. The Cambrian Period B. The Ordovician Period C. The Silurian Period D. The Devonian Period E. None of the above
2. What kind of rock deposits indicate that continental conditions were widespread in the Devonian as a consequence of the Acadian Orogeny? Name two
3. When were coastal swamps widespread in what is now the U.S. as shown by extensive coal deposits?
A. The Cambrian Period B. The Ordovician Period C. The Silurian Period D. The Devonian Period E. The Mississippian Period F. The Pennsylvanian Period
4. What innovation in land-animal evolution allowed them to colonize upland environments? When does this first appear in the rock record?
5. Explain in your own words the significance of the Castile Formation. Include the two kinds of minerals found in this deposit. If one of these minerals formed in a dry season and one in a wet season, which is which?
6. What two causes have been suggested recently for this short-term and highly catastrophic mass extinction?
Explanation / Answer
1)The Silurian period that distinguish it from the present-day physical environment relate to conditions of low continental elevations combined with a much higher global stand in sea level.
2)Appalachian mountains are developed as a result of acadian orogeny, reveals elongate belts of folded and thrust faulted marine sedimentary rocks, volcanic rocks providing evidence for continental collision.
3) Coal deposits in Europe and North America date from the late Carboniferous periods of the Paleozoic when these areas were covered with forests dominated by large ferns and scale trees.The Appalachian and Interior Provinces contain dominantly bituminous coal in strata of Pennsylvanian age(ans F the pennsylvanian period)
4.Whatever their origins, animals may have ventured onto land early in the Cambrian. These animals were arthropods, and resembled centipedes about the size of crayfish. They probably didn't live on land, instead coming ashore to mate or evade predators. At this time the only land plants appear to have resembled mosses .
5)Castile formation consists of alternating layers of gypsum and calcite that may reflect an annual temperature cycle in the hypersaline water from which the minerals precipitated.The dry season is characterised by evaporite deposits and wet set season is characterized by calcite deposition
6) Flood basalt events (volcano eruptions), asteroid collisions, and sea level falls are the most likely causes of mass extinctions .
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