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Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [1] [2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.
A number of the limestones have minor flint-filled marine animal burrows, anticipating the massive flint beds of the Chase Group. With the exposure of the group's lower formations in the 1993 flooding , [ 3 ] the entirety of the Council Grove Group, from hillcrest Speiser Shale down to pond-level Americus limestone , is exposed for study from ...
The Americus Limestone is a member of the Foraker Limestone Formation in eastern Kansas, where it is quarried as a distinctive ornamental stone.In outcrop, it is typically recognized as two relatively thin but persistent beds of hard limestone separated by shale that forms the lowest prominent bench of the many benches of the Flint Hills.
Location of the Onondaga limestone outcrop in New York State, USA and Ontario, Canada The Onondaga Limestone is a group of hard limestones and dolomites of Devonian age that forms geographic features in some areas in which it outcrops ; in others, especially its Southern Ontario portion, the formation can be less prominent as a local surface ...
Konza Prairie Preserve, a tallgrass prairie in the Flint Hills A walking trail in the Konza Prairie shows the height of the grasses in the fall. Explorer Zebulon Pike first coined the name the Flint Hills in 1806 when he entered into his journal, "passed very ruff flint hills". The underlying bedrock of the hills is a flinty limestone.
Flint is a variety of quartz and the flint on the ridge is within the Vanport Limestone Member of the Allegheny Formation of Pennsylvanian age. [2] [3] Flint Ridge was an important source of flint and Native Americans extracted the flint from hundreds of quarries along the ridge. [4]
The limestone is unusually dominant in the proudwork level with the statue below, where the squared flints are selected for a whitish colour. Below this there are two rows of black flint and limestone chequers. Holy Trinity Church, Long Melford, Suffolk, is widely regarded as one of the finest wool churches in England.
Chalk is a limestone that consists of coccolith biomicrite. [1] A biomicrite is a limestone composed of fossil debris ("bio") and calcium carbonate mud (" micrite "). Most of the fossil debris in chalk consists of the microscopic plates, which are called coccoliths, of microscopic green algae known as coccolithophores .