Historical Geology Name
______________________________
Read Wicander and Monroe, Chapters
14 and 16 (37.pdf and 38.pdf) and answer the following questions.
Chapter 14 (37.pdf )
____ 1. The time of rifting in an extensional setting can
be determined by
a.
radiometric age dating of fault structures
b.
radiometric dating of displaced fossil beds
c.
radiometric dating of associated dikes, sills and lava flows
d.
it cannot be determined
____ 2. The separation of South America from Africa
occurred during the
a.
Late Triassic d.
Early Jurassic
b.
Early Triassic e.
Early Cretaceous
c.
Late Jurassic
____ 3. Cretaceous marine transgressions onto the
continents were caused by
a.
high sea level during interglacial times
b.
inflated oceanic crust due to high heat flow
c.
subsidence of land masses
d.
none of the above
____ 4. In the early Mesozoic the western margin of North
America underwent a transition from a(n) ________ to a _________-_________
plate boundary.
a.
active, continent-continent c.
passive, oceanic-continent
b.
passive, continent-continent d.
active, oceanic-oceanic
____ 5. The mountain building event in western North
America that began in the Jurassic and continued in to the Cenozoic is called
the:
a.
Sonoma orogeny d.
Rocky Mountain orogeny
b.
Antler orogeny e.
Alleghenian orogeny
c.
Cordilleran orogeny
____ 6. The giant batholiths of the Sierra, Idaho and Coast
Range were emplaced during the:
a.
Sevier orogeny d.
Laramide orogeny
b.
Nevadan orogeny e.
Sonoma orogeny
c.
Acadian orogeny
____ 7. The shift in subduction related magmatism from west
to east during the Nevadan orogeny was probably related to:
a.
depletion of the crust in material that could be melted in the western zone.
b.
change in the angle of subduction from low to high.
c.
change in the angle of subduction from high to low
d.
a decrease in the rate of subduction
e.
change from subduction to extension tectonics.
____ 8. The Sevier orogeny was characterized by
a.
extensive volcanism d.
fault block mountains
b.
batholith intrusion e.
rifting
c.
folding and thrusting
Chapter 16 (38.pdf )
9. Cascade volcanism is a result of subduction of the
__________________ plate under North America.
10. More than half of Florida’s mineral wealth is in
___________________ deposits of marine origin.
____ 11. The vertical grooved features on devils Tower are:
a.
bear claw scratches c..
closely spaced sheer zones
b.
optical illusions d.
columnar joints
12. List the two periods of the Cenozoic era. ______________________ _________________________
____ 13. The orogenic event of the North America Cordillera
which began in the Late Cretaceous and extended into the Cenozoic is the:
a.
Laramide c.
Antler
b.
Sevier d.
Nevadan
____ 14. The Mesozoic orogenies of the Cordillera:
a.
progressively effected areas from west to east
b.
progressively effected areas from east to west
c.
involved only deformation and no magmatism
____ 15. The angle of the subducted slab during the
Laramide orogeny was:
a.
very steep resulting in volcanism near the trench
b.
very shallow resulting in volcanism near the trench
c.
very steep causing deformation far inland
d.
very shallow causing deformation far inland
____ 16. The Columbia River volcanic field can be best
described as:
a.
andesitic stratovolcanoes
b.
voluminous basalt lava flows
c.
voluminous rhyolitic tuff eruptions
____ 17. Formation of the basin and range mountains is a
result of:
a.
thrust faulting c.
normal faulting
b.
folding and faulting d.
volcanism
____ 18. During the Early Tertiary, the Gulf Coastal Plain
was covered by the:
a.
Zuni sea b. Tejas sea c.
Sundance sea
____ 19. Salt domes form because:
a.
folding causes an upward structure
b.
high density salt masses rise in response to gravity
c.
low density salt rises in response to gravity
d.
meteorite impacts cause an upward movement of low density salt
____ 20. Streams that cut across ridges are called:
a.
imposed streams c.
superposed drainage
b. canyons d. erosional streams