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63 relations: Amphibolite, Anglesey, Archibald Geikie, Arenig, Arfon Group, Bangor, Gwynedd, Basalt, Basement (geology), Breccia, Caernarfon, Cambrian, Columnar jointing, Conglomerate (geology), Diorite, Ediacaran biota, Facies, Fauna, Felsic, Foraminifera, Gabbro, Garnet, Geologic time scale, Gneiss, Graben, Granite, Granitoid, Granodiorite, Granophyre, Greenschist, Gwynedd, Half-graben, Harlech Dome, Harlech Grits Group, Henry Hicks (geologist), Lava, Leucogranite, Lithology, Llŷn Peninsula, Llyn Padarn, Mesoproterozoic, Metamorphism, Monzogranite, Neoproterozoic, Paleoproterozoic, Pebidian Supergroup, Pluton, Potassium feldspar, Precambrian, Proterozoic, Quartz, ..., Rhyolite, Sarn Complex, Schist, Scoria, St Davids, Terrane, Trawsfynydd, Trondhjemite, Tuff, Unconformity, Volcanic arc, Wrekin Terrane, Zircon. Expand index (13 more) »
Amphibolite
Amphibolid is a metamorphic rock that contains amphibole, especially the species hornblende and actinolite, as well as plagioclase.
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Anglesey
Anglesey (Ynys Môn) is an island situated on the north coast of Wales with an area of.
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Archibald Geikie
Sir Archibald Geikie (28 December 183510 November 1924), was a Scottish geologist and writer.
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Arenig
In geology, the Arenigian (or 'Arenig') refers both to a time interval during the Lower Ordovician period and also to the suite of rocks which were deposited during this interval.
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Arfon Group
The Arfon Group is a stratigraphically defined geological group of rocks that are present in the Cymru Terrane around Bangor in North Wales, United Kingdom.
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Bangor, Gwynedd
Bangor is a city in Gwynedd, northwest Wales.
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Basalt
Basalt is a common extrusive igneous (volcanic) rock formed from the rapid cooling of basaltic lava exposed at or very near the surface of a planet or moon.
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Basement (geology)
In geology, basement and crystalline basement are the rocks below a sedimentary platform or cover, or more generally any rock below sedimentary rocks or sedimentary basins that are metamorphic or igneous in origin.
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Breccia
Breccia is a rock composed of broken fragments of minerals or rock cemented together by a fine-grained matrix that can be similar to or different from the composition of the fragments.
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Caernarfon
Caernarfon is a royal town, community, and port in Gwynedd, Wales, with a population of 9,615.
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Cambrian
The Cambrian Period was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon.
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Columnar jointing
Columnar jointing is a geological structure where sets of intersecting closely spaced fractures, referred to as joints, result in the formation of a regular array of polygonal prisms, or columns.
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Conglomerate (geology)
Conglomerate is a coarse-grained clastic sedimentary rock that is composed of a substantial fraction of rounded to subangular gravel-size clasts, e.g., granules, pebbles, cobbles, and boulders, larger than in diameter.
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Diorite
Diorite is an intrusive igneous rock composed principally of the silicate minerals plagioclase feldspar (typically andesine), biotite, hornblende, and/or pyroxene.
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Ediacaran biota
The Ediacaran (formerly Vendian) biota consisted of enigmatic tubular and frond-shaped, mostly sessile organisms that lived during the Ediacaran Period (ca. 635–542 Mya).
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Facies
In geology, a facies (pronounced variously as, or; plural also 'facies') is a body of rock with specified characteristics, which can be any observable attribute of rocks such as their overall appearance, composition, or condition of formation, and the changes that may occur in those attributes over a geographic area.
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Fauna
Fauna is all of the animal life of any particular region or time.
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Felsic
In geology, felsic refers to igneous rocks that are relatively rich in elements that form feldspar and quartz.
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Foraminifera
Foraminifera (Latin for "hole bearers"; informally called "forams") are members of a phylum or class of amoeboid protists characterized by streaming granular ectoplasm for catching food and other uses; and commonly an external shell (called a "test") of diverse forms and materials.
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Gabbro
Gabbro refers to a large group of dark, often phaneritic (coarse-grained), mafic intrusive igneous rocks chemically equivalent to basalt, being its coarse-grained analogue.
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Garnet
Garnets are a group of silicate minerals that have been used since the Bronze Age as gemstones and abrasives.
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Geologic time scale
The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.
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Gneiss
Gneiss is a common distributed type of rock formed by high-grade regional metamorphic processes from pre-existing formations that were originally either igneous or sedimentary rocks.
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Graben
In geology, a graben is a depressed block of the Earth's crust bordered by parallel faults.
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Granite
Granite is a common type of felsic intrusive igneous rock that is granular and phaneritic in texture.
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Granitoid
A granitoid or granitic rock is a variety of coarse grained plutonic rock similar to granite which mineralogically is composed predominantly of feldspar and quartz.
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Granodiorite
Granodiorite is a phaneritic-textured intrusive igneous rock similar to granite, but containing more plagioclase feldspar than orthoclase feldspar.
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Granophyre
Granophyre (from granite and porphyry) is a subvolcanic rock that contains quartz and alkali feldspar in characteristic angular intergrowths such as those in the accompanying image.
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Greenschist
Greenschists are metamorphic rocks that formed under the lowest temperatures and pressures usually produced by regional metamorphism, typically and 2–10 kilobars.
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Gwynedd
Gwynedd is a county in Wales, sharing borders with Powys, Conwy, Anglesey over the Menai Strait, and Ceredigion over the River Dyfi.
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Half-graben
A half-graben is a geological structure bounded by a fault along one side of its boundaries, unlike a full graben where a depressed block of land is bordered by parallel faults.
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Harlech Dome
The Harlech Dome is a geological dome in southern Snowdonia in north Wales.
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Harlech Grits Group
The Harlech Grits Group is a lower to middle Cambrian lithostratigraphic group (a sequence of rock strata) in northwest Wales.
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Henry Hicks (geologist)
Henry Hicks, MRCS, FRS (26 May 1837 – 18 November 1899) was a Welsh physician, surgeon, Member of the Royal College of Surgeons (MRCS), geologist, President of the Geological Society and Fellow of the Royal Society (FRS).
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Lava
Lava is molten rock generated by geothermal energy and expelled through fractures in planetary crust or in an eruption, usually at temperatures from.
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Leucogranite
Leucogranite is a light-colored, granitic, igneous rock with almost no dark minerals.
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Lithology
The lithology of a rock unit is a description of its physical characteristics visible at outcrop, in hand or core samples or with low magnification microscopy, such as colour, texture, grain size, or composition.
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Llŷn Peninsula
The Llŷn Peninsula (Penrhyn Llŷn or italic) extends into the Irish Sea from north west Wales, south west of the Isle of Anglesey.
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Llyn Padarn
Llyn Padarn is a glacially formed lake in Snowdonia, Gwynedd, north Wales, and is an example of a moraine dammed lake.
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Mesoproterozoic
The Mesoproterozoic Era is a geologic era that occurred from.
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Metamorphism
Metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change).
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Monzogranite
Monzogranites are biotite granite rocks that are considered to be the final fractionation product of magma.
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Neoproterozoic
The Neoproterozoic Era is the unit of geologic time from.
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Paleoproterozoic
Paleoproterozoic Era, spanning the time period from (2.5–1.6 Ga), is the first of the three sub-divisions (eras) of the Proterozoic Eon.
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Pebidian Supergroup
The Pebidian Supergroup is an Ediacaran (i.e. late Precambrian) lithostratigraphic supergroup (a sequence of rock strata) in Pembrokeshire, west Wales.
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Pluton
In geology, a pluton is a body of intrusive igneous rock (called a plutonic rock) that is crystallized from magma slowly cooling below the surface of the Earth.
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Potassium feldspar
Potassium feldspar refers to a number of minerals in the feldspar group, and containing potassium.
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Precambrian
The Precambrian (or Pre-Cambrian, sometimes abbreviated pЄ, or Cryptozoic) is the earliest part of Earth's history, set before the current Phanerozoic Eon.
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Proterozoic
The Proterozoic is a geological eon representing the time just before the proliferation of complex life on Earth.
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Quartz
Quartz is a mineral composed of silicon and oxygen atoms in a continuous framework of SiO4 silicon–oxygen tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of SiO2.
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Rhyolite
Rhyolite is an igneous, volcanic rock, of felsic (silica-rich) composition (typically > 69% SiO2 – see the TAS classification).
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Sarn Complex
The Sarn Complex is a group of closely related igneous rocks that intrude and cut through other rock lithologies in the Cymru Terrane in Wales.
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Schist
Schist (pronounced) is a medium-grade metamorphic rock with medium to large, flat, sheet-like grains in a preferred orientation (nearby grains are roughly parallel).
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Scoria
Scoria is a highly vesicular, dark colored volcanic rock that may or may not contain crystals (phenocrysts).
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St Davids
St Davids or St David's (Tyddewi,, "David's house") is a city, a community (full name St David's and the Cathedral Close) and a parish in Pembrokeshire, Wales, lying on the River Alun.
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Terrane
A terrane in geology, in full a tectonostratigraphic terrane, is a fragment of crustal material formed on, or broken off from, one tectonic plate and accreted or "sutured" to crust lying on another plate.
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Trawsfynydd
Trawsfynydd (Welsh for "across mountain") is a village in Gwynedd, Wales, adjacent to the A470 north of Bronaber and Dolgellau near Blaenau Ffestiniog.
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Trondhjemite
Trondhjemite is a leucocratic (light-colored) intrusive igneous rock.
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Tuff
Tuff (from the Italian tufo) is a type of rock made of volcanic ash ejected from a vent during a volcanic eruption.
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Unconformity
An unconformity is a buried erosional or non-depositional surface separating two rock masses or strata of different ages, indicating that sediment deposition was not continuous.
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Volcanic arc
A volcanic arc is a chain of volcanoes formed above a subducting plate, positioned in an arc shape as seen from above.
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Wrekin Terrane
The Wrekin Terrane is one of five inferred fault bounded terranes that make up the basement rocks of the southern United Kingdom.
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Zircon
Zircon is a mineral belonging to the group of nesosilicates.
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References
[1] https://en.wikipedia.org/wiki/Cymru_Terrane
