GLGY 301 FINAL Exam Questions With Verified Answers
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Course
GLGY 301
Institution
GLGY 301
GLGY 301 FINAL Exam Questions With
Verified Answers
Who was the first to describe the phenomenon of extinction and when - answergeorges cuvier
in 1796
what are the two types of extinction - answernormal background and mass extinction
what is normal background extinction - answerextinction rate...
GLGY 301 FINAL Exam Questions With
Verified Answers
Who was the first to describe the phenomenon of extinction and when - answer✔georges cuvier
in 1796
what are the two types of extinction - answer✔normal background and mass extinction
what is normal background extinction - answer✔extinction rates less than or equal to the rate of
speciation over time
what is mass extinction - answer✔rate of extinction greatly exceeds the rate of speciation.
usually defined by the loss of more than 75% of known species in a geologically short interval
why are mass extinctions important in evolution - answer✔clears out niches, leaving low
diversity remnants of once diverse lineage, makes ecological opportunities available leading to
proliferation / diversification of new lineages
what are the causes of mass extinctions - answer✔extensive flood basalt volcanism - can change
temp by adding greenhouse gases
sea level fall - impacts marine org,
ocean anoxia - low oxygen in ocean, could be related to gases in atmosphere
asteroid impact - crater in the yucatan peninsula (mexico)
when was the end permian extinction - answer✔about 250MA
what percent of known marine and terrestrial genera were wiped out in the end permian
extinction - answer✔90-95% of marine, 70% of terrestrial genera
how long was the duration of the end permian mass extinction - answer✔200,000 years
what was the itchysoaurs - answer✔marine reptile, very few sites of this age in the world. This
one was found in the sulphur mountain formation
sulphur mountain formation - answer✔rare fossil bearing unit for its age
diverse assemblage of early-middle triassic itchysoaurs - improved early evolutionary history -
found in BC
Where would you find conodonts, ammonoids and what does this area show - answer✔west
coast of BC - shows that some terranes of the cordillera formed near the equator
Where would you find trilobites - answer✔found in abundance near cranbrook
Where would you find ichtyosaurs - answer✔in wapti lake in eastern central BC and near the
alberta boarder, also found in prince george and van island, prince george has a fossils of over
30M long
Where are fossils found that show mass extinction, what is the main fossil of study -
answer✔fossils found on queen charlotte islands ~ 65MA, found through radiolarian
microfossils
where would you find a plesiosaurs, mosasaurs and elasmosaur - answer✔van island - has an
80M y/o elasmosaur
where would you find ammonites and ancient submarines - answer✔near Fernie BC, floating in
water, largest ammonite was 2m in diameter
Where were cretaceous forests found - answer✔Vancouver island
what type of environment was the eocene environment - answer✔lake environment - important
as is links the salmon with the grayling family
when was the eocene period - answer✔55-34MA
importance of fossil pollen and climate change - answer✔10000-7000YA, modern forests
developed 4000YA - the world got increasingly more moist, pollen can give evidence of climate
change as pollen preserves extremely well - reveals ancient plant life
When did work start in the CR? And why did modern understanding not come until the 1990's? -
answer✔work started in 1868, there were prior difficulties, helicopters, air photos and base maps
allowed work to progress
1669: what was nicolas steno's contribution to geology - answer✔law of superposition - rocks on
the bottom are oldest
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