Stratigraphy

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3 domain-specific abstractions whose origin domain is Stratigraphy.

• Complex (geology) — A lithodemic unit grouping two or more lithodemes from more than one genetic class where ordinary stratigraphic succession is not an adequate organizing principle.
• Principle of lateral continuity — The stratigraphic principle that sedimentary layers initially extend laterally until they thin, grade, terminate against a basin boundary or are cut by later erosion.
• Sadler effect — The inverse dependence of measured sediment accumulation rate on the duration of the measurement interval, caused by hiatuses and erosion increasingly captured at longer timescales.