GEOLOGY QUIZ 16 What defines the boundaries between each of the three eras in the geologic timescale? -two great mass extinctions -principles of relative dating -the age of the earth divided by three -a decision by the Geological Society of America What is a possible cause of the extinction of event called the Great Dying? -a great outpouring of lava at the end of the Paleozoic -a meteorite impact that killed the dinosaurs -a new kind of super predator that devoured nearly all the life in the oceans -a sudden increase in the oxygen content of the atmosphere during the Precambrian In what time period did fishes and creatures with shells appear on earth? -Paleozoic -Precambrian -Mesozoic -Cenozoic Upon what basis were the upper and lower boundaries of the Mesozoic Era defined? -abrupt changes in the types of fossils representing mass extinction -dramatic changes in the color of the rocks from green to tan -the discovery that a meteoroid impact may have killed the dinosaurs -major episodes of mountain building The geologic timescale detailed and divides geologic time based upon -fossil data -rock thicknesses -unconformities What types of life developed during the Paleozoic? -corals, crinoids, and other creatures with shells -plants and insects -fish and amphibians -trilobites -All these choices are correct GEOLOGY QUIZ 16 What types of life developed during the Paleozoic? -corals, crinoids, and other creatures with shells -plants and insects -fish and amphibians -trilobites -All of these are correct In which of the following time periods were mammals the dominant type of life? -Cenozoic -Paleozoic -Mesozoic -Precambrian This figure shows the geologic time scale. Which period listed below would be part of the Paleozoic. -cambrian -pannyslavian -permian -mississippian -all of these choices are correct GEOLOGY QUIZ 16 This figure shows the geologic time scale. Which period listed below would be part of the Cenozoic. -Neogene -Jurassic -Triassic -Cambrian How would we use isotopic ages to infer the ages of the upper and lower unit in this diagram? -the dike is younger than the lower unit but older than the upper unit. -The lower unit would be younger than an age of the crosscutting dike. -An age on the dike is younger than the lower unit but older than the upper unit. -The upper unit would be older than an age determined on pebbles of the dike in that unit.

Geology Quiz 16

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