Fichas
Geo final
Fichas del conjunto (55)
- 1prokaryotic vs eukaryoticsingle celled oreganisms, came first-pro
eukaryotic- larger, has neucleas, reproduces sexually - 2proterozoic vs. archean continentsArchean-30% 40% continent mass
Proterozoic- supercontinents forming (rodinia and pannotia) - 3greenville orogonyformation of rodinia (first super continent)
- 4proterozoic supercontinents2- rodinia and panotia
- 5early Paleozoic continents6 super continents
- 6Laurentiasupercontinent containing north america
- 7eperic seashallow inland seas, created 4 major cratonic in n. America sequences due to transgressions and regressions topped by an unconformity.
- 8cratonic sequencetransgressive
and a
regressive
cycle topped
by an
unconformity - 9transgressionsea level rises relative to land
- 10regressionpreviously submerged sea floor is exposed due to reduced sea level
- 11identify transgression/regressionlayering of limestone, mudstone, sandstone=transgression
layering of sandstone, mudstone, limestone=regression - 12understanding geologic history of N. America with cratonic sequencescratonic suguences help us see the periods of transgression and regression, as well as where the coastline was at certain times in N. America.
- 13# of Cenozoic Cartonic sequences in N. America6
- 14Mobile Beltlow, narrow crustal region of tectonic activity. ex: Quartz vein where gold is found
- 15Apalachian mountain orogenies1-Taconic Orogeny
2-Caledonian Orogeny
3-Acadian Orogeny - 16When did ancestral rocky mountains form?the late paleozoic
- 17Coal zones of north americaPensylvanian coal diposits
- 18end of paleozoic climatedry and arid
- 19Cambrian Explosionextreme organism diversification
- 20Burgess shalecambrian transgressive sequence in canada- holds best examples of cambrian flora and fauna
- 21possible causes of mass extinctionmeteor, climate change, ocean regression, shelf reduction due to formation of pangea, change in ocean salinity and oxygen levels due to melting glaciers.
- 22ordovicianvertabrets in fossil record
- 23silurianplants move onto land
- 24Devonianfish!, trees on land, first amphibians
- 25carboniferousfirst reptiles
- 26permianradiation of reptiles
- 27How long for pangea to break apartTriassic-cenozoic
170,000,000 years - 28Where did pengea first start breakingrift between laurentia and gondwana, N america seperates from africa
- 29evidence for dryer climate in Mesozoicevaporate deposits, red beds, sand dunes, lack of clays and muds
- 30Mesozoic climateFairly warm and dry
- 31mesozoic cratonic sequences/cause2/highest rise in sea level since ordovician due to high rate of tectonic plate motion
- 32when Sundance sea formedJurassic
- 33cretacious interior seawaycovered middle north america
- 34Morison formationsedimentary deposited during sundance era/richest source of dino fossils
- 35order/region/why of Sonoma, Sevier, Nevadan, and Laramide Orogeny1-Sonoman
2-Nevadan
3-Sevier-
4-Laramide- - 36region/why of Sonoma orogenyWest Coast-island arc collision
- 37region/why of Sevier Orogenythrust faults east of sierra nevadas, thin skin crust deformation, change in subduction zone due to thrust faults
- 38region/why of Nevadan Orogenysierra Nevada, Colorado batholith, British Columbia coast range.-granite at depth due to subduction zone, and then later uplift
- 39Region/why Of Laramide orogenyModern day rocky mountains, and n/s of rockies, wrinkles caused by shallow angle subduction zones, plate scraped against bottom of continental plate
- 40terrain accretion in Western North Americajurrasic terrain accretion
arc formed in devonian - 41mesozoic natural resourcescoal, gulf oil, cretaceous sea way oil, iron (red beds), kimberlite pipes (diamonds), Gold
- 42saurischianlizard-like pelvis
- 43ornithischianBird-like pelvis
- 44herbavoresornithischians ate mostly....
- 45What is Archaeopteryxposibly the first bird/ theropod (ornithischia) features with feathers and a fused pelvis.
- 46cynodont/what is it an ancestor formammal like reptile, possible mammal ancestor
- 47events that led to the mass extinction at the end of the Mesozoicmeteor/deccan traps flood basalt eruption/warmer climate/changed habitat, regression of shallow cretaceous sea
- 48how the West coast changed during the Cenozoicsubduction zones changed causing volcanism and mountain building, created cascade range
- 49how The John Day Area formedsubduction angle increased, volcanism begins on west coast, forms john day area. contains best fossils from 60 years ago including evolution of the horse
- 50stages of mountain building were there for the Cascade mountains and when did they begin3 stages-began with western cascades 20 mybp
- 51Columbia river flood basaltscliffs and plateaus formed by volcanism 17-6 mybp due to NW extension effecting the columbia river gorge
- 52basin and range-When?formed during miocene
- 53Climate in early cenozoicwarmest in mid-Eocene, then cooled leading to ice age in Pleistocene
- 54last major ice age2 mybp
- 55sea levels in cenozoicvery low sea levels compared to the rest of earths history