n
A geologic fault which has exhibited seismic activity within a geologically recent time period.
adj
(geology) Networked into irregularly branching and reconnecting veins of ore.
n
(geology) A geologic process that explains how and why antecedent rivers can cut through mountain systems instead of going around them.
n
(geology) Two or more beds or strata of rock united by the occurrence of fossils of the same characteristic species or genera.
n
(geology) A massive, unlayered, mound-shape body in discordant relationship to the surrounding layered facies which drape over it; thus either a reef or a bank (after Asquith, 1979, p.73).
adj
(geology, of a layer of rock) Subjected to boudinage.
n
eluviation caused by the chelating action of acids in the environment
adj
(geology) Intruding parallel to the bedding.
n
the weathering of material through the repeated freezing and thawing of water.
n
(geology) The layer of igneous, sedimentary, and metamorphic rocks that forms the geological continents.
n
(geology) The outermost layer of the lithosphere of the Earth.
n
(geology) planation by the action of ice
n
(geology) The removal of soil and other loose material from the ground (or another surface) by wind, leaving it exposed to erosion.
n
(geology) A lowering of a surface by erosion or weathering
n
(geology) The laying bare of rocks by the washing away of the overlying earth, etc.; or the excavation and removal of them by the action of running water.
n
(geology) The location of the thickest deposit in a sedimentary basin.
n
(geology) a subterranean interface at which seismic velocities change
n
(geology) The wearing away or falling to pieces of rocks or strata, produced by atmospheric action, frost, ice, etc.
n
(geology) A plane of separation between rock masses.
n
(geology) A conical column of soil formed by erosion of the surrounding material
n
(geology) A process by which the Earth's crust spreads sideways and exposes deep-seated rocks.
n
(geology) An encrustation of soluble salts, deposited on rock or soil by evaporation; often found in arid or geothermal environments.
adj
Accompanied by eruptions.
adj
(geology) Formed in an estuary by alluvial deposition.
n
(geology) The formation of niches or potholes by erosion due to vortices of water
n
(geology) A layer of rock of common origin. [from 19th c.]
n
(geology) A fault or crack in a rock.
n
The study of volcanic interactions with glacial ice.
adj
(geology) striated around grains
n
(geology) A collection of formations or rock strata.
n
(geology) A specific layer of soil, or stratum
n
The concussion that occurs when large masses of ice break up due to contraction.
adj
(geology) Exhibiting illuviation.
n
(geology, astronomy) A crater formed from a hypervelocity impact, typically of a meteorite, as opposed to one formed by other means such as vulcanism.
adj
(geology) Below a trappean stratum
n
(geology) An area of older rocks surrounded by younger rocks, typically formed by erosion of part of the younger rock.
adj
(geology) Occurring between beds of rock.
adj
(geology) Between eruptions.
v
(geology) To put or insert between other strata.
adj
(geomorphology, astronomy) Occurring within a crater
adj
(geology) Taking place within a single tectonic plate.
n
(geology) The presence or formation of joints (fractures in which the strata are not offset).
n
(geology) A small scale sequence of fine layers that occurs in sedimentary rocks.
n
(geology) An upwelling of abnormally hot molten material from the Earth's mantle which spreads sideways when it reaches the lithosphere.
n
(geology) A very large lineation (typically as a result of glaciation)
n
(geology, oceanography) any of an interconnected system of broad submarine rises formed by plate tectonics
n
(geology) The Mohorovičić discontinuity; the Moho.
n
(geology) The boundary between the Earth’s crust and mantle.
n
(geology) A sheet-like mass of rock that has been folded over adjacent strata.
n
(geology) An obsequent geological feature.
n
(geology) A linear geosynclinal belt lying between continental and oceanic cratons, and having internal volcanic belts (eugeosynclinal) and external nonvolcanic belts (miogeosynclinal). Also known as geosynclinal couple; primary geosyncline.
n
(geology) A part of a formation separated from the rest of the formation by erosion.
n
(geology) A fold whereby the strata are forced through an angle of more than 90 degrees, so that younger strata lie below older ones.
n
(geology) Any deformation caused by a sustained force.
n
(geology) The formation of ravines.
n
(geology, volcanology) An area of frequent earthquakes and volcanic activity, around the Pacific Ocean.
n
(geology) One of the geographical faults running through San Andreas, California.
n
(ecology) A layer of vegetation, usually of similar height.
n
(geology) A region of the Earth where one tectonic plate dives beneath another into the interior of the Earth.
adj
(geology, oceanography) Forming a background with unusually high concentrations of something.
n
(geology) The deposition of one stratum over another; the principle that in a series of sedimentary strata, the lower strata are the older.
adj
(geology) Occurring at the same time as deposition.
n
The raising of a geographical area as a consequence of plate tectonics.
n
(geology) A low-frequency seismic event associated with volcanoes
n
(geology, seismology) A transform fault.
n
Tension (experience by a rock mass or area of the Earth's crust) resulting from both extensive and transtensive shear.
n
(geology) A volume of rock or ice of identifiable origin and age range that is defined by the distinctive and dominant, easily mapped and recognizable petrographic, lithologic or paleontologic features (facies) that characterize it.
n
(geology) The geological event which produces such a barrier (volcano, earthquake, etc)
n
(geology) the deformation of the Earth's crust over a large area
n
(geology) The direction in which stratigraphy becomes younger, for a particular formation
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