Geo 103 exam 3

The breakup of Pangea began in the:

• Triassic period
• Mesozoic era
• Cretaceous period
• Jurassic period

What types of sediment (terrestrial or marine) was deposited in the Triassic rift basins?

• Glacial
• Terrestrial
• Volcanic
• Marine

When the small ocean basins opened between North America, Africa, and South America what types of
sedimentary rock were being deposited along the passive continental margins?

• Dolomite and quartzite
• Sandstone and granite
• Shale and limestone
• Gneiss and schist

Which of the following is not an example of a buoyant landmass?

• volcanic archipelago

• continental crustal fragments

• ocean island chains

• old oceanic crust

The Sevier Orogeny is known for:

• the fold and thrust belt

• granitic intrusions

• accretion

• normal block faulting

• reverse block faulting

What is thin-skinned tectonics?

• Thin-skinned tectonics is only observed in areas with igneous rock formations.
• Thin-skinned tectonics involves volcanic activity in deep crustal layers.
• Thin-skinned tectonics involves deformation in shallow crustal layers, often seen in sedimentary rock areas with thrust faults and folding.
• Thin-skinned tectonics primarily affects the Earth's mantle.

The dominant shelled animal(s) of the Mesozoic seafloor is the:

a) brachiopod,
b) gastropods (snails),
c) pelecypods (clams),
d) a, b, and c are correct only,
e) b and c are correct only.

• brachiopod,
  gastropods (snails),
  pelecypods (clams),

• gastropods and pelecypods

• Brachiopods
• gastropods

• pelecypods

Which of the following was a reef building organism is the Mesozoic Era?

• rudistid clams

• tabulate corals

• rugose corals

• stromatoporids

• crinoids

Which of the following is not a Mesozoic marine organisms:
a) trilobites
b) ammonites
c) sea urchins
d) gastropod mollusks,
e) plesiosours

• b) ammonites
• c) sea urchins
• d) gastropod mollusks
• a) trilobites
• e) plesiosours

What is a therapsid? When (what period) was their greatest influence on land?

• Permian period
• Triassic period
• Cretaceous period
• Jurassic period