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25 Cards in this Set

  • Front
  • Back
driver of 4th and 5th order cycles
milancovich cycles
shallow seas within a continent
affect that within the northern hemisphere deflects everything (currents, sediment plumes, etc.) to the right
corialis effect
ideal turbidite sequence
bouma sequence
lithologically distinct stratigraphic unit that is large enough in scale to be mappable int he surface or traceable int he subsurface
break or interuption in sediemtnation
lateral contact which beds thin to extinction
pinch out
cyclic sediemntation patter that is controlled by outside forces
distinct rock type roughly corresponding to a depositiona mode
"thos facies con only be superimposed that can now be found side by side"
walther's law
3 combinations leading to transgression
rise in sea level, stop in sedimentation, beach subsiding
how do cyanobacteria aid int he precipitation of calcium carbonate?
eat up CO2 in the oceans, reducing the acidity of sea water
system tract below sequence boundary above maximum flodding surface
highstand systems tract
surface separates lowstand systems tract from transgressive systems tract
transgressive surface
regional surface of erosion that results from baselevel fall
sequence boundary
regional downlap surface
maximum flooding surface
systems tract marked by retrograding rock units
transgressive systems tract
units defined by bounding surfaces
stratigraphic units
sedimentary structure produced by styorms
hummocky cross beds
currents set up by thermohaline circulation that flow parallel to the depth contours due to density stratification in the ocean
contour currents
sediment in the oceans derived from land
terrigenous sediement
clacareous and siliceous shelled planktonic organisms settling through the water column
pelagic rain
stratigraphic sections of similar polarity
polarity zone
how do cyanobacteria aid in the precipitation of calcium carbonate?
eat CO2 reducing the acidity in the water
bouma sequence
E - no features except burrows
D - parallel laminated mud
C - current ripples, laminations, fine sand and silt
B - parallel laminated sands
A - graded gravel and sand