9159486
Description
Flashcards by Allison Andresen, updated more than 1 year ago
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Created by Allison Andresen
almost 7 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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