Tegesé saka "coquina" ing bausastra Basa Inggris

Coquina minangka watu sedimen sing kasusun banget utamané utawa meh kabeh saka fragmen sing diangkut, abraded, lan mekanik sing diurut saka kerang saka moluska, trilobites, brachiopoda, utawa invertebrata sing liya. Kanggo endapan sing bisa dianggep dadi coquina, ukuran rata-rata partikel nyusun kudu ukuran 2 mm utawa luwih. Coquina bisa bervariasi saka kekandhuran sing ora becik. Istilah "coquina" asalé saka tembung Spanyol kanggo cockleshells utawa shellfish. Coquina sing ora lengkap lan dikonsolidasi dianggep minangka gandum ing sistem klasifikasi Dunham kanggo karbonat sedimentary rocks. Coquinas diklompokake minangka biosparit miturut klasifikasi sedimentary rocks. Coquinas ngasilake lingkungan laut lan lacustrine kanthi energi dhuwur ing ngendi arus lan ombak ngasilake kuwat, abrasion, fraktur, lan ngurutake cangkang, sing nyusun. Akibaté, biasane ngetokake sprei sing dikembangake kanthi apik utawa nyemprotake, kemasan cedhak, lan orientasi apik saka pecahan shell sing nyusun. Coquina is a sedimentary rock that is composed either wholly or almost entirely of the transported, abraded, and mechanically sorted fragments of the shells of either molluscs, trilobites, brachiopods, or other invertebrates. For a sediment to be considered to be a coquina, the average size of the particles composing it should be 2 mm or greater in size. Coquina can vary in hardness from poorly to moderately cemented. The term "coquina" is derived from the Spanish word for cockleshells or shellfish. Incompletely consolidated and poorly cemented coquinas are considered grainstones in the Dunham classification system for carbonate sedimentary rocks. Well-cemented coquinas are classified as biosparites according to the Folk classification of sedimentary rocks. Coquinas accumulate in high-energy marine and lacustrine environments where currents and waves result in the vigorous winnowing, abrasion, fracturing, and sorting of the shells, which compose them. As a result, they typically exhibit well-developed bedding or cross-bedding, close packing, and good orientation of the shell fragments composing them.