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Geology unit 4
Terms in this set (30)
Generally, a transgression accompanies a
rise in sea level
During Early Paleozoic, the continent that we know today as North America was somewhat different and in historical geology we call it
Today, the base of the Cambrian System is placed at the level of what sort of feature?
oldest occurrence of a specific trace fossil
During late cambrian, the ocean that lay roughly in the position of the Atlantic Ocean was called
Volcanism during Ordovician resulted in widespread beds of volcanic ash, which are found now as weathered clays called
Economically important Silurian deposits of what material accumulated in the southern Appalachians, particularly around Birmingham, Alabama?
Immediately following the Taconic orogeny in the eastern United States, what sediment was deposited?
Queenston clastic wedge
The Paleozoic sedimentary record across the North American craton has been divided into unconformity-bounded cratonic sequences. Each cratonic sequence documents what sequence of events?
transgression followed by regression
As the Tippecanoe sea spread across large areas of North America, it deposited what unusually pure unit of well-sorted, well-rounded grains, which is used in glass manufacturing?
St. Peter Sandstone
In Cambrian rocks, the abundance of clean quartz sands and carbonate rocks with stromatolites, mud cracks, and marine fossils indicates that
the seas were shallow and warm
What unusual Permian sedimentary deposit formed in a relatively deep marine basin in Wyoming, Montana, and Idaho?
What does the presence of tillites and striations on Permian bedrock suggest occurred during Permian?
glacial ice movement and melting
What are the two major North American cratonic sequences that formed as a result of transgressions during Late Paleozoic?
Kaskaskia and Absaroka
The great supercontinent that assembled during Late Paleozoic was called
What is the name of the late Paleozoic oregony that occurred in the western United States?
What orogeny occurred as a result of Gondwana colliding with Euramerica (North America and Europe) during Late Carboniferous? (alle)
What orogeny occurred during Devonian as a result of North America (Laurentia) and Europe (Baltica) colliding to form Euramerica? (acad)
The Delaware basin and other basins in western Texas and New Mexico had reefs around the edge and were associated with evaporite deposits.
\What age are the deposits of these Late Paleozoic basins, which are now exposed in the Guadalupe Mountains?
The Chattanooga Shale is a thin, but extraordinarily widespread, black or dark gray shale, which lacks fossils of bottom-dwelling invertebrates, but which contains uranium, finely disseminated pyrite and organic matter.
These characteristics indicate that it accumulated in what type of depositional environment?
What characterizes Mississippian sedimentary deposits of the interior of North America?
limestones with many crinoids
What is the name of the synapsid fossil group that had large sail-like features on their backs?
Fossil marine animals similar to the one shown in this figure have two enclosing symmetrical valves. What are these fossils called?
Fossil remains of animals appear in this order (from oldest to youngest) in the geologic record
fish, amphibians, reptiles, mammals
The first land-dwelling vertebrates were
The tiny skeletal remains of this organism are used as guide fossils in Paleozoic sedimentary rocks.
What is the name of this fossil group?
The therapsids were
tetrapods with mammal-like traits
Fossils of the earliest animals with shells included
small tubular shells
What is the age of the oldest fossil amniotes, which have been found in coal swamp deposits?
Which is considered to be the main contributing factor in causing the end-Permian mass extinction?
global volcanic activity
One group of organisms developed a vascular system to transport water and nutrients and also developed the ability to stand up against the pull of gravity, which were adaptations that helped them live on land.
What type of organisms were they?
first land-dwelling plants
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