Geology 112 -- Historical Geology
Review Topics
This page last updated 24 September, 2002
- Life
- Cambrian Explosion - life vs. fossils
- Ordovician radiation, which groups were dominant
- Ordovician and Devonian reef systems
- End-Ordovician and end-Devonian extinction events -causes, evidence
- Origin of fish - Agnatha, Placoderms (origins of jaws)
- Land Plants - two adaptive innovations allow for colonization of land
on large scale
- land plant radiation as proximal cause of end-Devonian mass extinction
- Orgin of amphibians, reptiles.
- Tectonics
- Overall scenario is coalescence of Pangea during most of the Paleozoic
- Compare and contrast the Taconic (Queenston Delta), Acadian (Catskill
Delta) and Appalachian (Alleghenian) Orogenies
- Antler Orogeny on western margin
- Uplift of ancestral rockies and Umcompaghre Uplift in response to uplift
of Ouachita Mtns.
- Tectonics
- Eastern margin
- Rifting of Pangea and formation of Newark Supergroup
- Continued deposition along passive margin during Mesozoic, changeover
from carbonate deposition - siliciclastic deposition along northern portion
of eastern margin during L. Cretaceous time
- Western margin - know the style of mtn building and geologic terranes
associated with each tectonic event
- Accretion of Sonomia and Golconda Arc during Sonoma Orogeny
- Jurassic sand seas of w. interior
- Nevadan Orogeny
- Sundance Sea - Morrison Fmt.
- Sevier Orogeny - Mowry Sea - Cretaceous Interior Seaway
- Life
- Marine Invertebrates
- Mesozoic Marine Revolution
- Dominant invertebrate groups,
- Marine vertebrates- time of pelagic reptiles
- Terrestrial Systems
- Plants
- Gingkos & Cycads
- Origin of angiosperms (flowering plants) in Cretaceous time
- Vertebrates
- Amniotic egg as space ship
- radiation of reptiles in the face of coalescence of Pangea and increasing
aridity
- 3 reptile groups in place by end of Paleozoic time
- mammal-like reptiles
- Dinosaurs
- Importance of end-Triassic extinction in determining dominant terrestrial
vertebrates during Mesozoic time
- Evidence of asteroid impact at end of Cretaceous
- Tethys Sea, rudist reefs
- Separation of Australia from Antarctica, initiation of climatic deterioration,
ABW, Antarctic Current
- Separation of Greenland from both N. Europe and N. America, establishment
of NADW
- How are 18O/16O ratios used as indicators of climate?
- Western Margin
- Paleogene
- Laramide Orogeny, why unusual
- Front Range, Beartooth, Wind River, Black Hills (mountains)
- Uinta, Green River, Big Horn, Powder River (basins
- Yellostone Hot Spots
- Volanics of the Absaroka Range, preservation of forest successions
in lava flows
- Mississippi Embayment Cret-Paleogene sediments kms thick
- Life
- Marine
- adaptive radiation of planktic forams, nannoplankton, whales, pinnipeds
(seals, wlaruses), scleractinian corals
- Terrestrial
- Adaptive radiation of mammals - what general features characterize mammals?
- Paleocene - first appearance of primates and rodents
- Eocene most orders of mammals first appear
- Oligocene - radiation of carnivores
- Three groups of extant mammals, all possess the tribosphenic molar
- Three great adaptive radiations. Who were the players on Australia,
World Continent, S. America?
- GABI - exchange equal at family level and for primary genera, however
asymmetrical pattern for secondary genera. What is the pattern?
What are the hypotheses to explain it?
- Neogene
- Development of the American West -understand the rock types and major
structural styles associated with the Geologic Provinces of the western
interior and west coast: rocky mtns, CO Plateau, Basin & Range
(& Great Basin), Columbia and Snake River Plateaus, Cascade Range,
Sierrra Nevada, Great Valley, Coast Ranges (inc. transverse ranges)
- Miocene
- Cascade volcanism
- uplift of coast ranges
- uplift of basin and range
- Columbia River basalts
- regional uplift of CO Plateau, Rocky mtn. area
- Plio-Pleistocene
- Snake River Basalts
- Faulting & Deformation of coast ranges, San Andreas Fault
- Great Valley becomes terrestrial basin
- Uplift of present Sierra Nevadea = rain shadow effect, Great Basin
becomes desert
- Rockies & CO Plateau achieve modern elevation, final cutting of
Grand Canyon, Ogallala Fmt.
- Glaciation of the Rockies
- Mechanism for final uplifts are debated, basin & range associated
with subduction of E. Pacific Rise = transform boundary = extension, rocky
mountains from isostatic adjustment after Sevier Orogeny
Eastern Margin: Secondary uplift of Appalachians and subsequent erosion to
produce appalachian provinces (Allegheny Plateau, Valley and Ridge, Triassic
Basins, Blue Ridge and Piedmont and Coastal Plain).
- Pleistocene - drastic and rapid climate fluctuations of glacials and interglacial
(icehouse vs. greenhouse earth)
- 4 glacial advances & retreats of Laurentide ice sheet
- controls drainage of modern rivers in midcontinent, produced Great
Lakes, Finger Lakes and erosion of Rockies & Sierra Nevada
- Lakes in Basin & Range that have subsequently dried up (Bonneville,
Great Salt Lake)
- Marine record oxygen isotopes from deep sea cores, what is the marine
isotopic scale?
Human evolution
- New evidence suggests early evolution of hominids more like a bush than
a linear branching tree
- Understand the interplay between global and regional tectonics and climate
change, the ecological theory for the origin of Australopithecus
and Homo. How does cooling/drying factor into the two last
stages of human evolution?