Geological Time, Provenance & Erosion

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Abstractions about reconstructing Earth history through dating, stratigraphic continuity, sediment movement, erosion, deformation, provenance, paleoclimate evidence, fossils, and stage boundaries. They connect rates and gaps in the geological record with physical landscape change.

18 abstractions in this family — domain-specific abstractions that sit near one another in structural-signature space (k-means over structural-signature embeddings). Each is shown with its short description.

• Absolute dating — The estimation of an event or object's numerical age or calendar range rather than only its relative order.
• Coastal sediment transport — Move and sort sediment alongshore and cross-shore through wave, current, tide, surge and wind forcing, continually coupling seabed grain properties to evolving beaches, bars, dunes and inlets.
• 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.
• Erosion and tectonics — The coupled feedback by which tectonic deformation creates relief that drives erosion while erosion redistributes mass and alters stress, uplift and deformation.
• Expanding Earth — An obsolete geophysical hypothesis that continental separation resulted from a substantial increase in Earth's radius or volume, superseded by plate tectonics and modern geodesy.
• Global Paleoclimate Indicators — Geological, biological and geochemical proxies selected to track climatic conditions beyond a single local depositional setting.
• Hydraulic action — Mechanical erosion in which moving water and pressure fluctuations directly dislodge material from a riverbed, bank or coast.
• Intraplate deformation — Folding, faulting or distributed flow of lithosphere within a tectonic plate rather than primarily at its recognized boundary.
• Natural nuclear fission reactor — A uranium-rich geological deposit in which naturally supplied fissile concentration, moderation, geometry, and water conditions once sustained intermittent nuclear chain reactions without human construction.
• Paleoliquefaction — Geologic evidence of prehistoric earthquake-induced soil liquefaction, used to infer shaking events that predate instrumental or written records.
• Pediment (geology) — A gently sloping erosional bedrock surface extending from the foot of a retreating upland, commonly bearing only a thin veneer of transported sediment.
• Postglacial vegetation — Plant communities and succession established on land exposed after glacial retreat.
• 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.
• Provenance (geology) — The source regions, parent rocks and transport histories from which sediment or sedimentary rock was derived, inferred by integrating mineralogical, geochemical, geochronological and textural evidence.
• 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.
• Torrejonian — A North American Land Mammal Age interval in the early Paleocene defined and correlated through characteristic terrestrial mammal assemblages.
• Trilobite zone — A Cambrian biostratigraphic interval recognized by the occurrence or assemblage of characteristic trilobite taxa and used to correlate rock successions.
• Westphalian (stage) — A regional northwest-European Carboniferous stratigraphic stage associated with major coal-measure successions and historically divided into lettered substages.