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ESCI – 1210 – Natural Science 1210 Fall 2016 George Barrows Week 4 – 09/14/2016 Sedimentary Rocks ­ Form from sediment (weathered products) ­ Make up 75% of all rock outcrops ­ Used to reconstruct most of Earth’s history o Reveal clues about much of Earth’s history o Provide information about sediment transport o Often contain fossils Economic Importance ­ Coal ­ Petroleum and natural gas ­ Iron and aluminum Classifying Sedimentary Rocks ­ Based on the source of the material o Detrital o Chemical Detrital ­ Solid particles ­ Classified by particle size ­ Common rocks o Shale (most common) o Sandstone o Conglomerate Chemical ­ Derived from the material that was once in a solution and precipices from sediment o Results from physical processes or o Through life processes (biochemical origin) Common Chemical Rocks ­ Limestone (most abundant) ­ Microcrystalline quartz ­ Evaporites such as rock salt and gypsum ­ Coal (compressed plant material) Lithification ­ How sedimentary rocks are formed ­ Loose sediments transformed into solid rock through this process o Compaction o Cementation by:  Calcite  Silica  Iron Oxide Features of Sedimentary Rocks ­ Strata or beads (most characteristic) ­ Bedding planes separate strata ­ Foss