Exam (elaborations)
Geology 204 Exam Questions And Answers Latest Update
- Course
- EOS 204
- Institution
- Duke University
Geology 204 Exam Questions And Answers Latest Update
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Geology 204 Exam 1 2024-2025Questions And Answers Latest Update
superposition - oldest layers are ALWAYS on bottom, youngest layers on the top
original horizontally - rocks are layered down (=deposited) in flat, horizontal
layers
lateral continuity - layers of sediment initially extend laterally in all directions,
continuous contact
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, cross-cutting relationships - a principle or law stating that a disrupted pattern is
older than the cause of disruption.
inclusions - clasts in a sedimentary bed are older than the bed itself
uncomformity - A break in the geologic record created when rock layers are
eroded or when sediment is not deposited for a long period of time.
what does noncomformity seperate? - it seperates older igneous rock from
younger, overlying sed rock
angular uncomformity - angular relationship between older deformed sed rock
and younger, less deformed sed strata
example of angular uncomformity - the bottom of the grand canyon
disconformity - a type of unconformity in which the sedimentary layers above and
below the unconformity are parallel
how can you tell a disconformity is there? - absence of fossils that should be there
(based on presence somewhere else)
fossil succession - fossils occur in sedimentary rocks in a particular vertical order
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