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Geology 5- Chapter 10
Terms in this set (15)
The Paleozoic ocean that separated North America and what is now northern Europe when the supercontinent Rodinia rifted apart was known as the _______________. During the Paleozoic that ocean closed as another supercontinent formed.
The early Paleozoic begins with the
Curing the Cambrian, the North American continent was
Submerged beneath an epicontinental sea except for the transcontinental arch region
The Paleozoic events included at least 4 periods when the seas transgressed onto the North American Continent and then _____________ off the continent.
Westward of the early Paleozoic transcontinental arc the western mountains (Cordillera) had not formed and the area was marine. In areas offshore where muds (shales) were being deposited, a floating, plankton feeding, colonial organism found a suitable habit for life. These organisms are important guide fossils especially during the Ordovician. These were the ______________.
The boundary of the base of the Cambrian System is marked by the first appearances of feeding burrows of this organisms (which is known only from its feeding traces and hence is known as a trace fossil).
A basin where evaporation produced heavy brines that sink to the bottom and were prevented from escaping because of the sill or barrier is called
An extensive accumulation of mostly clastic sediments (sands, silts, and muds) that are deposited in an area adjacent to an uplifted region is called a/an _____________. These sediments are caused by erosion of the uplifted area (mountains) and are transported by water.
During what geologic period were extensive evaporite minerals deposited in the Michigan Basin?
In the Cordilleran region, the earliest deposits were sands, which graded westward into finer clastics and carbonates. An excellent place to study this Sauk transgression is along the walls of the
Grand Canyon of the Colorado River
There were 3 major extinctions in the Paleozoic at the ends of the Ordovician, Devonian, and ___________ periods.
The excellent guide fossils, often looking almost like pencil marks to the unaided eye, found in dark shales of Ordovician age, are called
The Phanerozoic Eon includes these three eras in this order from oldest to youngest
Paleozoic, Mesozoic, Cenozoic
Why might a petroleum geologist today be interested in the location of graptolite fossils?
Graptolite fossils are important in finding shales
Think about what a clastic wedge is. Consider California. Where do you think you could find a huge clastic wedge that is still developing today?
Death Valley could have a developing clastic wedge
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