Sedimentary Rocks/EPCC/LM5 A

Sedimentary Rocks

Depositional Environments

Clastic Sedimentary Rocks

Breccia

Conglomerate

Grain size is greater than 2 mm or granule size or larger

Clastic Sedimentary Rocks

Sandstones

Sandstone is a clastic sedimentary rock made up mainly of sand-size (1/16 to 2 millimeter diameter) weathering debris. Environments where large amounts of sand can accumulate include beaches, deserts, flood plains and deltas.

Clastic Sedimentary Rocks

Siltstone is a clastic sedimentary rock that forms from silt-size (between 1/256 and 1/16 millimeter diameter) weathering debris.

Clastic Sedimentary Rocks

Shale is a clastic sedimentary rock that is made up of clay-size (less then 1/256 millimeter in diameter) weathering debris. It typically breaks into thin flat pieces.

Chemical Sedimentary Rocks

Limestone is a rock that is composed primarily of calcium carbonate. It can form organically from the accumulation of shell, coral, algal and fecal debris. It can also form chemically from the precipitation of calcium carbonate from lake or ocean water.

Chemical Sedimentary Rocks Evaporites

Rock Salt and Rock Gypsum are chemical sedimentary rocks that forms from the evaporation of ocean or saline lake waters.

Chemical Sedimentary Rocks

Chert is a microcrystalline or cryptocrystalline sedimentary rock material composed of silicon dioxide (SiO2). It breaks with a conchoidal fracture, often producing very sharp edges

Coal is an organic sedimentary rock that forms mainly from plant debris.

Sedimentary Structures

Cross bedded sandstone

Sedimentary Structures

Graded Bedding

Sedimentary Structures

Mud Cracks

Fossilized Mud Cracks

Sedimentary Structures

Ripple Marks

Sedimentary Structures

Trace Fossils