Geologic Times
Terms
undefined, object
copy deck
- strata
- layers of rock
- varves
- banding seen in strata
- unconformity
- gap in rock record caused by an eroded surface being buried
- angular unconformity
- fault or fold is buried
- disconformity
- an older sedimentary rock is weathered and buried by newer sedimentary rock
- intrusion
- dikes,sills and other protons - ingeneous
- inclusion
- particles from erosion that move up into newer layers - sediment
- thin ring tells us
- drought,winter,volcano
- thick varves varves
- wet seosons/summer
- thin or dark varves
- winter
- light varves
- summer/dry seosons
- keybed
- sediment layer that servers as a time marker in the rock record and result from volcanic ash ir meteorite-impact
- correlation
- matching up similar rock formation from different places
- dendrochronology
- age=#'s of rings
- the rusting (oxidation) of rocks tells us
- oxygen was present
- thick rings tell us
- rainy season, spring/summer, fertilizer