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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.
Superposition
A principle in geology stating that in an undeformed sequence of sedimentary rocks, each layer is older than the one above it and younger than the one below it.