Sedimentary Rocks

• Rock Name: Conglomerate

• Composition: Assorted rock fragments

• Clastic Grain Size: Gravel (>2mm), rounded grains, poorly sorted

• Nonclastic:

• Characteristics: Rounded Gravel

• Rock Name: Quartz sandstone

• Composition: Quartz, silica cement, iron oxide cement

• Clastic Grain Size: Sand (0.625-2mm) Very well sorted and rounded

• Nonclastic:

• Characteristics: Quartz and sand grains

• Rock Name: Arkose

• Composition: Feldspar and Quartz

• Clastic Grain Size: Sand and Granules, moderate sorting with angular grains

• Nonclastic:

• Characteristics: Obvious Feldspar

• Rock Name: Lithic Sandstone

• Composition: Quartz and Lithic Fragments

• Clastic Grain Size: Sand, moderate to well sorting and rounding

• Nonclastic:

• Characteristics: Lots of dark rock fragments

• Rock Name: Mudstone and Shale

• Composition: Microscopic

• Clastic Grain Size: Clay/Silt

• Nonclastic:

• Characteristics: Mudstone is Lumpy and Shale breaks into layers

• Rock Name: Chalk

• Composition: Microscopic

• Clastic Grain Size:

• Nonclastic: Microcrystalline Coccolithophorids

• Characteristics: Super soft and dull

• Rock Name: Oolithic Limestone

• Composition: Reacts with HCL

• Clastic Grain Size:

• Nonclastic: Calcite ooids

• Characteristics: ooids like small balls

• Rock Name: Micrite

• Composition: Microscopic, reacts with acid

• Clastic Grain Size:

• Nonclastic: microcrystalline calcite

• Characteristics: Dark in colour

• Rock Name: Coal

• Composition: Carbon

• Clastic Grain Size:

• Nonclastic: Fine/Microcrystalline

• Characteristics: Shiny

• Rock Name: Chert

• Composition: Microscopic

• Clastic Grain Size:

• Nonclastic: Microcrystalline silica

• Characteristics: Conchoidal Fracture and very hard