EARTH SCIENCE
Atlas of Sedimentary Rocks

Arkose

Sedimentary Rocks

Sedimentary rocks are rocks composed of sediment. Sediment can be composed of rock or mineral fragments, organic debris or chemicals dissolved in water. Sediments are deposited in a number of environments of deposition, by both moving air and moving water.The links below are an attempt to show the common types of clastic, chemical and biologic sedimentary rocks and some of the varieties that are found. It is by no means a complete list of the types and varieties that are found in the world.

Atlas of Sedimentary Rocks
Rock Name / Image Texture Composition Images
Arkose Clastic Feldspar and quartz sand and gravel Close-up1
Bauxite Chemical Carbonate and gibbsite Al(OH)3 Close-up1
Chalk Biologic Foraminifera shells and calcite Close-up1
Chert Chemical or Biologic Silica / quartz Close-up1
Conglomerate Clastic Quartz sand and gravel Close-up1
Dolostone Chemical Dolomite, with minor calcite and quartz Close-up1
Graywacke Clastic Lithic sand Close-up1
Limestone (Cherty) Chemical and Biologic Calcite, chert Close-up1
Limestone (Fossiliferous, Encrinal) Biologic Calcite and crinoid fragments Close-up1
Limestone (Hematite) Chemical Calcite, hematite, and fossil fragments Close-up1
Limestone (Oolitic) Biologic Calcite oolites and fossil fragments Close-up1
Limestone (Sandy Silty) Chemical/Clastic Calcite breccia, quartz sand and silt, hematite Close-up1
Oolite (Siliceous) Chemical Quartz pseudomorphs of carbonate oolites Close-up1
Phosphorite Chemical Collophane [Fluorapatite Ca5(PO4)3F] Close-up1
Rock Anhydrite Chemical Anhydrite Close-up1
Rock Gypsum Chemical Gypsum Close-up1
Sandstone (Argillaceous) Clastic Quartz sand with hematite Close-up1
Sandstone (Glauconitic) Clastic Quartz sand Close-up1
Sandstone (Hematite) Clastic Quartz sand with hematite Close-up1
Sandstone (Quartz) Clastic Quartz sand Close-up1
Shale (Argillaceous) Clastic Silt Close-up1
Shale (Oil) Clastic Silt and petroleum Close-up1
Siderite Rock Chemical Siderite, quartz and chlorite Close-up1
Siltstone Clastic Quartz sand Close-up1
Tufa (Calcareous) Chemical Calcite Close-up1