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Fragments of rock get broken down into sediments Sediments are transported, compacted, and cemented into rock 1. 2. 3. ARE USUALLY FORMED IN A WATERY ENVIRONMENT. OFTEN LAYERED ARE THE ONLY ROCKS THAT CONTAIN FOSSILS Fossil formation http://www.classzone.com/books/earth_science/terc/conte nt/visualizations/es2901/es2901page01.cfm Sedimentary Rocks are formed at or near the Earth’s surface when sediments are compacted and cemented together. forming Strata – layers of rock Clastic •Form from sediments compacted and cemented together. •Identified by the size of their fragments Crystalline/Chemical • Form from the evaporation of sea water and precipitation of minerals. (when water evaporates and minerals are left behind. Bioclastic/organic Form from the remains of once living things (shells and plants) Clastic- made by compaction and cementation of sediments. Identified by the size of their fragments Biolclastic (organic)- made from living things such as shells and plants ex: (limestone and coal) Chemical (crystalline)- formed when water evaporates and leaves behind the minerals to harden (ex: halite – rock salt) Usually only one mineral Generally these rocks are formed from one mineral Rock salt (halite) Rock gypsum- made from gypsum Bituminous coal- fossil fuel Formed from plant remains in Swampy areas- most are millions Of years old Limestone- made from Mineral calcite and Fragments of shells What type of rock is made of particles .05 cm? What type of rock is made of particles .1 cm? What is the chemical composition of bituminous coal? What rock is formed from biological remains or precipitation? What is the grain size of siltstone? What are evaporites? Sediments: Weathered fragments (pieces) of other rocks that range in size from pebbles, sand silt and clay. Clastic Sedimentary Rocks: rocks made of sediments compacted and cemented together. Crystalline/Chemical sedimentary rocks; rocks that form when minerals solidify (precipitate) out of an evaporated solution. Bio-clastic sedimentary rocks: rocks made of once living things.