adj
(geology) Characterised by an abrupt change in texture.
adj
(geology) Pertaining to or occurring at excessive depths in the earth's crust; plutonic.
adj
Springing back, as the bottom of an anaclastic glass.
n
(soil science) The mixing of soil by water (streams or cycles of wet and dry).
adj
(geology) Broken in place; said of rocks having a broken or brecciated structure due to crushing, in contrast to those of brecciated materials brought from a distance.
adj
(geology) Describing a sedimentary rock that is composed of the remains of small organisms
n
(petrology) A rock composed of angular fragments in a matrix that may be of a similar or a different material.
adj
(geology) Formed or broken into breccia.
adj
(geology) Converted into calcrete
n
(geology) cataclastic rock (a type of metamorphic rock that has been wholly or partly formed by the progressive fracturing and comminution of existing rock)
n
A type of cataclastic rock that is formed by fracturing and comminution during faulting.
adj
(geology, of rock) Made from fragments of pre-existing rocks.
v
(transitive, mineralogy) To break a single crystal (such as a gemstone or semiconductor wafer) along one of its more symmetrical crystallographic planes (often by impact), forming facets on the resulting pieces.
adj
Of or pertaining to colluvium
adj
(geology) Composed of concretions
adj
(geology, of a subsurface horizon) perennially frozen
n
(geology) Dark silt accumulating mainly from airborne volcanic sediment or soot from artificial pollution, or detritus in water of ablation from ice sheets or glaciers. Cryoconite typically appears either as surface discoloration or in cryoconite holes.
n
The geologic processes that create permafrost.
n
(geology) Any flysch-like material other than sandstone or schist which is found in similar formations.
n
(geology) Alternate layers of sedimentary sand and mud formed in a glaciomarine environment
adj
(geology) Pertaining to or formed by degradation.
adj
(geology, of igneous rock) Extrusive; having solidified after being poured out as molten lava.
n
(petrology) Crudely chopped flints, believed to be naturally produced by geological processes such as glaciation.
n
(geology) A body of rock with specified characteristics reflecting its formation, composition, age, and fossil content.
adj
(geology, of soil) Of fluviatile, marine or lacustrine origin.
adj
(geology, of a rock) Having a structure of thin layers.
adj
(geology) consisting of fragments
adj
(geology) Composed of the fragments of other rocks.
adj
(geology) Modified by gelifraction
adj
(geology) of or relating to gneiss
adj
(mineralogy) Having a granular structure.
adj
(geology) Having a texture that resembles writing, commonly created by exsolution, devitrification and immiscibility processes in igneous rocks.
n
(geology) An argid that has a moderately developed argillic horizon.
n
(geology) A type of volcanic rock containing glassy clasts, that is, fragments.
adj
(geology) lying between poriferous areas
n
(geology) An igneous rock that is forced, while molten, into cracks or between other layers of rock
n
(geology) An intrusion of the continental crust subject to anatexis.
n
(anthropology) A stone tool or projectile
n
(geology) A uniform mass of rock that has different lithology to that of the surrounding rock.
n
The process by which non-loess ground becomes loess ground; the process of loess deposit formation; the transformation of a silty deposit into loess.
adj
(geology) Transformed into marble by metamorphism
adj
(geology) Homogenous, unstructured.
n
(geology) A very large breccia
n
(rare, chiefly geology) A very large fragment.
n
(geology) Rock showing evidence of having been remelted after it originally solidified.
n
(humorous) A rock that is believed to be a meteorite, but is in fact terrestrial in origin; a pseudometeorite.
n
(geology) A sedimentary rock composed of relatively coarse sand grains in a very fine silt or clay matrix
n
(geology) A neovolcanic rock
n
A layer in a body of water in which the nitrate concentration changes rapidly with depth
n
(geology) A conglomerate containing mostly clasts
adj
(geology) Of rock, having a character intermediate between that of autochthonous rock (which is native to its location) and allochthonous rock.
n
(geology) A type of rock with plastic inclusions
adj
(geology) Having grains or layers of multiple minerals
adj
(geology, of a fold) Having an irregular and/or disconnected pattern.
n
A rock mostly composed of rock fragments of volcanic origin
adj
(mineralogy) Having the appearance of ruins, or of the ruins of houses.
n
(geology) Irregular streaks of different composition in some igneous rocks.
adj
(geology) Produced by alteration or deposition subsequent to the formation of the original rock mass.
adj
(geology, of a rock) Made by the deposition and compression of small particles.
adj
Pertaining to, or containing, sediment.
adj
(geology) Said of sedimentary rock exhibiting thin layers, whether or not they control how the rock breaks. Compare with laminated.
adj
(geology) Descriptive of rocks with extensive horizontal development
n
(geology) A subvolcanic xenolith
adj
(geology) Describing a sedimentation unit that lacks structure and is composed of various-sized particles that are mixed to a greater extent in the lower section.
n
(geology) Any sedimentary deposit formed by a turbidity current.
adj
(geology, of rock) Having veins, typically of metal or quartz
adj
(geology) Being a clastic rock chiefly composed of volcanic materials
adj
(geology) Containing vugs.
n
Alternative spelling of Vulcanism (“historical scientific view”) [(historical) The belief, held mostly in the 18th century, that rocks were formed in fire. It was a rival theory to Neptunism.]
n
(geology) any piece of rock having a different origin to that of the igneous rock in which it is found
adj
(mineralogy) Having a pattern of broken stripes.
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