EARTHSC 1122 Lecture Notes - Lecture 6: Siltstone, Mudrock, Biomineralization
4 Dec 2015
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Sedimentary rocks: what is their origin, deposition of layers of loose particles, remains of organisms (biomineralization), minerals precipitated from water. Smaller the grain size, further from the source the rock is. Sediment grain size classification: mud: clay/silt > 1/256 mm-1/16 mm. : shale, claystone, siltstone: rock name, sand: fine sand, medium sand, coarse sand > 1/16 mm-2 mm, rock name. : sandstone: gravel: granule, pebble, cobble, boulder > 2 mm-256 mm, rock name. Siliciclastic rocks: process of formation: loose particles (sediments) resulting from breakdown (weathering) of rocks, sediments are usually eroded (transported) from their points of origin, then deposited in layers, layers: bedding or lamination.
