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This glossary contains brief definitions of technical geologic terms prepared by the NPS Geologic Resources Inventory program and used in GRI publications and NPS geology and minerals websites.
Nov 4, 2017 · Learn Geology. a'a —a lava rock with a ropey, frothy surface texture formed as a cooling crust on a fluid lava flow. ablation —the removal of snow and ice by melting or evaporation, typically from a glacier or ice field. abrasion —the process of wearing down or rubbing away by means of friction, typically by wind-blown dust or sand ...
longitudinal profile. Illustration of the topography of the base of a stream, showing zones of sediment production, transport, and deposition.
All series/epochs used to be formal Lower/Early, Middle, Upper/Late. Today, some series/epochs of the geologic time scale are named: The Silurian, Permian, Tertiary, and Quaternary Systems/Periods are completely subdivided into named series/epochs. The rest use Lower/Early, Middle, and Upper/Late as “placeholders,” and so they are capitalized.
Stratigraphic nomenclature is the system of proper names given to specific stratigraphic units, which provides a universal language essential for all scientific publications. Consistent and effective communication in the geosciences requires systematic use of stratigraphic nomenclature.
Longitudinal profiles are plots of the elevation vs distance from the stream mouth to the upper reaches within watershed basin. They help to establish relationship between slope steepness and distance from the upper to lower reaches. Slope or gradient can be measured in degree or percentage (rise over run).
Geology. Fundamentals of Geology (Schulte) 4: Soil. 4.6: Soil Profiles and Types. Expand/collapse global location. 4.6: Soil Profiles and Types. Page ID.
