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Schist is a medium-grade metamorphic rock with medium to large, flat, sheet-like grains in a ... In the context of underground coal mining, shale was frequently referred to as slate well into the 20th century. ... containing coal or plant remains; there are also schistose ironstones (hematite-schists), but metamorphic beds of salt ...


This page is a glossary of geology. Main article: Geology. Main category: Geology terminology .... This term is widely applied to a coal or peat that originated at the place where the plants comprising it grew and ... where a rigid tabular body such as a bed of sandstone, is stretched and deformed amidst less competent beds.


Apr 4, 2016 ... View Test Prep - SEVEN 200-237.docx from GEO 102 at SUNY Stony Brook. 1. Coal beds originate in this: freshwater coastal swamps and bogs ...


Coal begins as dead plant material (trees, ferns, leaves-- typically) which fall into oxygen depleted waters in low energy swamp or swamp-like setting.


Coal is a sedimentary rock of biochemical origin. ... The key to large productive coal beds or seams seems to be long periods of time of organic accumulation ...


urged with great energy. This, the doctrine of allochthonous origin, conceives that coal beds are composed of transported vegetable matter deposited in the sea ...


Feb 28, 2017 ... These are described separately as to occurrence and origin. .... Underclay is a clay that occurs under a coal bed or under a coal horizon.


Sep 11, 2013 ... Turbidites; Varves; Marine Limestone; Tsunami Deposits; Coal; Meandering .... They originate similar to the way cross-beds develop, by the ...


Classification of Sedimentary Rocks by Origin ... Coal- Coal is a sedimentary rock formed from the compaction of partially decayed plant material (requires stagnant water and ... -Series of thin, inclined layers within a horizontal bed of rock.


Some sedimentary rocks form by the consolation of plant (i.e., coal) or animal remains ... Some streams in the Black Hills have stream beds composed largely of ... In fact, most of South Dakota's sedimentary rocks are marine in origin, that is,  ...