1 -
Distribution
True-False
Dinosaurs have been found on all
continents.
Dinosaur endemism (distinctive characteristics resulting from isolation) was at an all-time high during the late Triassic, when Pangea was still intact.
Fill in the
Blank
True or False (Circle one) Many dinosaur genera live
4-8 million years.
2 -
Extinction
True-False
Major or intermediate mass
extinctions occurred at or near the ends
of the Ordovician, Devonian,
Permian, Triassic and Cretaceous periods.
The Alvarezes
postulated that the mass extinction at the end of the Cretaceous
was
caused by an asteroid impact because of the anomalously high
concentration
of Iridium at the K-T boundary.
Because of the
anomalously high concentration of Iridium at the K-T boundary,
the
Alvarezes postulated that the mass extinction at the end of the
Cretaceous
was caused by an asteroid impact.
Support for the
idea of an asteroid impact comes from shocked quartz,
microtektites,
and soot at the K-T boundary.
Shocked quartz, microtektites, and
soot at the K-T boundary supports the
idea of an asteroid
impact.
Plant productivity on land and in the oceans appears to have shut down completely at the K-T boundary.
Much of the evidence cited as support for an asteroid impact has been attributed to eruption of the Deccan Traps in India by C. B. Officer.
The authors of your book don't think much of the asteroid impact hypothesis.
Multiple Choice
The
impact crater formed from the asteroid impact is thought to have
been
found _________________.
A. in Gubbio, Italy B. under the Deccan
Traps in India
C. buried under the Yucatan Peninsula of Mexico,
the Chicxulub Crater D.
all of these E. none of these
Fill
in the Blank
Give the name of a non-dinosaur group that went
extinct abruptly at
the K-T boundary: ______________ .
True
or False (Circle one) The pollen record of Montana, North
Dakota
& Wyoming shows Cretaceous species going extinct precisely
at the Iridium
anomaly, followed by a fern pollen spike, followed by
a return of flowering
seed plants characteristic of the
Paleocene.
True or False (Circle one) Acid rain might have
resulted from the impact
at Chicxulub because it was an area of
evaporite deposition.
True or False (Circle one) Only dinosaurs
went extinct at the K-T boundary.