GLY 1102 Topic 8

At their maximum, Cretaceous seas covered approximately half of the present land area of the Earth
False (1/3)
For most of the Mesozoic, __ occurred along the western margin of North America causing the formation of volcanic arcs and numerous collisional events of volcanic arcs and microcontinents
Closer toward the margins of Pangaea, __ climates of altering wet and dry seasons were common
Higher average temperatures cause some expansion of ocean waters and raise sea levels
Although Pangaea was beginning to rift apart in the __, the still-connected continents facilitated widespread dispersal of the dinosaurs
If the average rate of seafloor spreading increases on a global basis, ridge volume decreases
False (increase)
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The Connecticut River Valley was a Mesozoic __ containing abundant dinosaur footprints
rift basin
By the Middle Jurassic, sea level began to rise again, continuing to a high level in the __
Late Cretaceous
Dry and hot desert conditions persisted in many interior continental areas of Pangaea during the Early and Middle Jurassic
Rocks of the Upper Jurassic contain more diverse and abundant dinosaur fossils then those of the earlier Jurassic
The Late Jurassic partial breakup of Pangaea and higher sea level increased the proximity of large land areas to the moisture of the ocean; as a result, climate become more continental (warmer with less seasonality) and drier
Monsoons are caused by seasonal differences in temperatures and atmospheric pressure between oceans and continents
During the Cretaceous, cool temperate forests covered the polar regions where there was seasonal snowfall and thick ice sheets
The lack of global glaciation would case sea level to be:
higher than today
At the peak of Mesozoic warmth, in the Cretaceous, the pole-to-equator temperature gradient was probably no more than __ degrees C
The continued warm climate of the Late Cretaceous, combined with higher than average seafloor spreading rates, resulted in the highest sea level of the Mesozoic
During the Early Cretaceous, conifers became dominant over cycads
During the Triassic, Gondwana was north of the equator
Higher Late Jurassic sea level flooded the low-lying portions of continents creating __ sea
An epicontinental
Plate tectonic events inhibited early dinosaur dispersal
During the Late Jurassic, an interior seaway called the __ Sea formed in North America, extending from the Arctic almost to the Gulf of Mexico
Flowering trees and grasses evolved during the Middle Triassic
During the Jurassic, western North America was covered by expansive eolian sands
Late Cretaceous lea level was so high that it flooded the entire Atlantic and Gulf coastal plains of the US
The average elevation of physiographic regions of the ocean basins can change over time, as a consequence of changes in the rates of __
Seafloor spreading
During the Late Cretaceous, forests grew in coastal Antarctica and in Canada as far north as 85 degrees N latitude
The Tethys Seaway divided Africa from Europe in the Middle Jurassic, separating African dinosaurs from their cousins to the north
The three geologic periods of the Mesozoic are, from the oldest to youngest,
Triassic, Jurassic, Cretaceous
The rise of the Late Jurassic sea level continued into the Cretaceous
Most sea level change during more recent ( last 2 million years ) geologic time has been the result of
changes in glacial ice volume