Examlex
_____________involves the study of Earth's origin and development through time based on sequences of strata, fossils, and geologic events, utilizing the geologic time scale as a reference.
Unconformity
A boundary where two different layers of rock meet, signifying a time when erosion occurred or new layers were not formed.
Original Horizontality
The principle that most sediments and many volcanic units are deposited in layers that originally are more or less horizontal.
Lateral Continuity
A geological principle that states layers of sediment initially extend laterally in all directions; in other words, they are laterally continuous.
Original Horizontality
A principle stating that layers of sediment are originally deposited horizontally under the action of gravity.
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