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Sedimentary Rocks Sedimentary rocks form when particles of other rocks or remains of plants and animals are pressed and cemented together. Sedimentary rocks Form on surface of the earth Often layered (bedded) May contain fossils or evidence of living organisms Kinds of sediments Detrital/Clastic – fragments of rocks such as gravel, sand and clay – Sandstone – Coquina Organic – sediments formed from the remains of plants and animals – Coal Chemical – mineral grains that precipitate out of solution by evaporation or chemical action – Ex: Limestone Weathering Existing rocks are broken down by physical and chemical weathering Weathering prepares rocks for erosion and transforms rocks into the raw materials that will become sedimentary rocks Two types: Chemical and Physical Erosion and Weathering Erosion – the picking up and physical removal of rock particles Weathered and eroded material can be transported by rivers, streams and glaciers What are some methods of erosion? Water Erosion Wind Erosion Sorting sediments When a river flows into an ocean or lake it drops sediments as its speed is reduced. Sediments to sedimentary rock – Deposition – Compaction – Cementation