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16 Cards in this Set

  • Front
  • Back
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