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  2. Breccia - Wikipedia

    en.wikipedia.org/wiki/Breccia

    Breccia is composed of coarse rock fragments held together by cement or a fine-grained matrix. [5] Like conglomerate, breccia contains at least 30 percent of gravel-sized particles (particles over 2mm in size), but it is distinguished from conglomerate because the rock fragments have sharp edges that have not been worn down. [6]

  3. Conglomerate (geology) - Wikipedia

    en.wikipedia.org/wiki/Conglomerate_(geology)

    A conglomerate or any clastic sedimentary rock that consists of a single rock or mineral is known as either a monomict, monomictic, oligomict, or oligomictic conglomerate. If the conglomerate consists of two or more different types of rocks, minerals, or combination of both, it is known as either a polymict or polymictic conglomerate.

  4. Volcaniclastics - Wikipedia

    en.wikipedia.org/wiki/Volcaniclastics

    Agglomerate, agglutinate pyroclastic breccia Tuffaceous conglomerate, tuffaceous breccia Conglomerate, Breccia > 64 Lapillistone 2 – 64 Coarse ash tuff Tuffaceous sandstone Sandstone 0.0625 – 2 Fine ash tuff Tuffaceous siltstone Siltstone 0.004 – 0.0625 Tuffaceous mudstone, tuffaceous shale Mudstone, shale < 0.004 75–100% pyroclasts

  5. Clastic rock - Wikipedia

    en.wikipedia.org/wiki/Clastic_rock

    Conglomerate Breccia. Notice the angular nature of the large clasts. Conglomerates are coarse grained rocks dominantly composed of gravel sized particles that are typically held together by a finer grained matrix. [4] These rocks are often subdivided into conglomerates and breccias.

  6. Cementation (geology) - Wikipedia

    en.wikipedia.org/wiki/Cementation_(geology)

    The new pore-filling minerals form "bridges" between original sediment grains, thereby binding them together. In this way, sand becomes sandstone, and gravel becomes conglomerate or breccia. Cementation occurs as part of the diagenesis or lithification of sediments.

  7. Diamictite - Wikipedia

    en.wikipedia.org/wiki/Diamictite

    Some geologists restrict the usage to nonsorted or poorly sorted conglomerate or breccia that consists of sparse, terrigenous gravel suspended in either a mud or sand matrix. [2] Unlithified diamictite is referred to as diamicton.

  8. Ferricrete - Wikipedia

    en.wikipedia.org/wiki/Ferricrete

    Ferricrete is a hard, erosion-resistant layer of sedimentary rock, usually conglomerate or breccia, that has been cemented into a duricrust by iron oxides. The iron oxide cements are derived from the oxidation of percolating solutions of iron salts. [1]

  9. Cataclasite - Wikipedia

    en.wikipedia.org/wiki/Cataclasite

    The term fault breccia is used for describing a cataclasite with coarser grains. A fault breccia is a cataclastic rock with clasts that are larger than two millimeters making up at least 30% of the rock. [4] These are the varieties based on the classification scheme of cataclasites proposed by Sibson: [1]