pyroclastic breccia

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• Breccia — (pronEng|ˈbrɛtʃiə, ˈbrɛʃiə, it. breach) is a rock composed of angular fragments of several minerals or rocks in a matrix, that is a cementing material, that may be similar or different in composition to the fragments. A breccia may have a variety …   Wikipedia

• breccia — /brech ee euh, bresh /, n. Petrol. rock composed of angular fragments of older rocks melded together. [1765 75; < It < Gmc; cf. OHG brecha breaking] * * * Coarse sedimentary rock consisting of angular or nearly angular fragments larger than 0. 08 …   Universalium

• volcanic breccia —    A volcaniclastic rock composed mostly of angular rock fragments greater than 2 mm in size.    The name volcanic breccia is not synonymous with pyroclastic breccia (volcanic breccia forms in different ways).    GG …   Glossary of landform and geologic terms

• Mount Cayley — The Mount Cayley volcanic complex in August 13, 2005. Summits left to right are Pyroclastic Peak and Mount Cayley. Elevation 2,377 m (7,799 ft) …   Wikipedia

• igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …   Universalium

• Crowsnest Formation — Stratigraphic range: Mid to Upper Albian …   Wikipedia

• Raise (Lake District) — Infobox Mountain Name = Raise Photo = Caption = Elevation = 883 m (2,897 ft) Location = Cumbria, ENG Range = Lake District, Eastern Fells Prominence = c. 88 m Parent peak = Helvellyn Coordinates = Topographic OS Landranger 90 Grid ref UK =… …   Wikipedia

• Aristifats Diatreme — The Aristifats Diatreme is a diatreme in the Northwest Territories, Canada, located about Unit km|100|0 east of Yellowknife. It is thought to have formed about 1850 million years ago with the eruption of pyroclastic breccia. [… …   Wikipedia

• Mount Meager — The Mount Meager volcanic complex rising above the Pemberton Valley. Summits left to right are Capricorn Mountain, Mount Meager proper and Plinth Peak …   Wikipedia

• Nova Iguaçu Volcano — The Nova Iguaçu Volcano ( Vulcão de Nova Iguaçu in Portuguese) is located in the state of Rio de Janeiro, Brazil, in an area of volcanic rocks at the north eastern border of the Mendanha massif. Klein and Vieira proposed the site to be an extinct …   Wikipedia

• Clastic rock — A thin section of a clast (sand grain), derived from a basalt score. Vesicles (air bubbles) can be seen throughout the clast. Plane light above, cross polarized light below. Scale box is 0.25 mm Clastic rocks are composed of fragments, or clasts …   Wikipedia