Geo final

Allison Andresen
Flashcards by Allison Andresen, updated more than 1 year ago
Allison Andresen
Created by Allison Andresen over 3 years ago
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Question Answer
prokaryotic vs eukaryotic single celled oreganisms, came first-pro eukaryotic- larger, has neucleas, reproduces sexually
proterozoic vs. archean continents Archean-30% 40% continent mass Proterozoic- supercontinents forming (rodinia and pannotia)
greenville orogony formation of rodinia (first super continent)
proterozoic supercontinents 2- rodinia and panotia
early Paleozoic continents 6 super continents
Laurentia supercontinent containing north america
eperic sea shallow inland seas, created 4 major cratonic in n. America sequences due to transgressions and regressions topped by an unconformity.
cratonic sequence transgressive and a regressive cycle topped by an unconformity
transgression sea level rises relative to land
regression previously submerged sea floor is exposed due to reduced sea level
identify transgression/regression layering of limestone, mudstone, sandstone=transgression layering of sandstone, mudstone, limestone=regression
understanding geologic history of N. America with cratonic sequences cratonic suguences help us see the periods of transgression and regression, as well as where the coastline was at certain times in N. America.
# of Cenozoic Cartonic sequences in N. America 6
Mobile Belt low, narrow crustal region of tectonic activity. ex: Quartz vein where gold is found
Apalachian mountain orogenies 1-Taconic Orogeny 2-Caledonian Orogeny 3-Acadian Orogeny
When did ancestral rocky mountains form? the late paleozoic
Coal zones of north america Pensylvanian coal diposits
end of paleozoic climate dry and arid
Cambrian Explosion extreme organism diversification
Burgess shale cambrian transgressive sequence in canada- holds best examples of cambrian flora and fauna
possible causes of mass extinction meteor, climate change, ocean regression, shelf reduction due to formation of pangea, change in ocean salinity and oxygen levels due to melting glaciers.
ordovician vertabrets in fossil record
silurian plants move onto land
Devonian fish!, trees on land, first amphibians
carboniferous first reptiles
permian radiation of reptiles
How long for pangea to break apart Triassic-cenozoic 170,000,000 years
Where did pengea first start breaking rift between laurentia and gondwana, N america seperates from africa
evidence for dryer climate in Mesozoic evaporate deposits, red beds, sand dunes, lack of clays and muds
Mesozoic climate Fairly warm and dry
mesozoic cratonic sequences/cause 2/highest rise in sea level since ordovician due to high rate of tectonic plate motion
when Sundance sea formed Jurassic
cretacious interior seaway covered middle north america
Morison formation sedimentary deposited during sundance era/richest source of dino fossils
order/region/why of Sonoma, Sevier, Nevadan, and Laramide Orogeny 1-Sonoman 2-Nevadan 3-Sevier- 4-Laramide-
region/why of Sonoma orogeny West Coast-island arc collision
region/why of Sevier Orogeny thrust faults east of sierra nevadas, thin skin crust deformation, change in subduction zone due to thrust faults
region/why of Nevadan Orogeny sierra Nevada, Colorado batholith, British Columbia coast range.-granite at depth due to subduction zone, and then later uplift
Region/why Of Laramide orogeny Modern day rocky mountains, and n/s of rockies, wrinkles caused by shallow angle subduction zones, plate scraped against bottom of continental plate
terrain accretion in Western North America jurrasic terrain accretion arc formed in devonian
mesozoic natural resources coal, gulf oil, cretaceous sea way oil, iron (red beds), kimberlite pipes (diamonds), Gold
saurischian lizard-like pelvis
ornithischian Bird-like pelvis
herbavores ornithischians ate mostly....
What is Archaeopteryx posibly the first bird/ theropod (ornithischia) features with feathers and a fused pelvis.
cynodont/what is it an ancestor for mammal like reptile, possible mammal ancestor
events that led to the mass extinction at the end of the Mesozoic meteor/deccan traps flood basalt eruption/warmer climate/changed habitat, regression of shallow cretaceous sea
how the West coast changed during the Cenozoic subduction zones changed causing volcanism and mountain building, created cascade range
how The John Day Area formed subduction angle increased, volcanism begins on west coast, forms john day area. contains best fossils from 60 years ago including evolution of the horse
stages of mountain building were there for the Cascade mountains and when did they begin 3 stages-began with western cascades 20 mybp
Columbia river flood basalts cliffs and plateaus formed by volcanism 17-6 mybp due to NW extension effecting the columbia river gorge
basin and range-When? formed during miocene
Climate in early cenozoic warmest in mid-Eocene, then cooled leading to ice age in Pleistocene
last major ice age 2 mybp
sea levels in cenozoic very low sea levels compared to the rest of earths history
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