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13 Cards in this Set

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area where evaporation excedes precipitation
eolian system
area covered by active dunes greater than 125 square km
erg
most distinct feature of eolian systems
trough cross bedding
wind picks up anything small leaving large material behind
desert pavement
thin veneer of sand
sheet sands
represents something that happened at the front of a dune possibly a collapse
reactivation surface
represents the migration patterns of dunes on top of each other
superposition surface
represents some change in the depositional pattern
interdune
regional unconformity
super surface
uncommon in the geologic record, lake setting, very disperse
lacustrine environment
alternating light and dark sequences representing seasonal changes
varves
stream flowing year round
perenial
stream not flowing year round
euphemeral