Gritstone

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Gritstone

Gritstone is a sedimentary rock

Sedimentary rock

Sedimentary rock is one of the three main Rock types . Sedimentary rock is formed by deposition and consolidation of mineral and organic material and from precipitation of minerals from solution....
composed of coarse sand

Sand

Sand is a naturally occurring granular material composed of finely divided rock and mineral particles.As the term is used by geologists, sand particles range in diameter from 0.0625 to 2 millimeters....
grains with inclusions of small pebbles. It is a coarser version of sandstone

Sandstone

Sandstone is a sedimentary rock composed mainly of sand-size mineral or rock Particle size . Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust ....
.

As gritstone is a fluvial sedimentary rock it frequently shows signs of cross-bedding

Cross-bedding

In geology, cross-bedding refers to inclined sedimentary rocks in a horizontal unit of rock. These tilted structures are deposits from bedforms such as ripples and dunes, and they indicate that the Sedimentary depositional environment contained a flowing fluid ....
or current bedding. It is quarried

Quarry

A quarry is a type of open-pit mining from which rock or minerals are extracted. Quarries are generally used for extracting building materials, such as dimension stone....
for building material.

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Encyclopedia

Gritstone is a sedimentary rock

Sedimentary rock

Sand

Sandstone

Cross-bedding

Quarry

A quarry is a type of open-pit mining from which rock or minerals are extracted. Quarries are generally used for extracting building materials, such as dimension stone....
for building material. British gritstone was used for millstone

Millstone

Millstones or mill stones are used in windmills and watermills, including tide mills, for grinding wheat or other grains.The type of stone most suitable for making millstones is a siliceous rock called buhrstone , an open-textured, porous but tough, fine-grained sandstone, or a silicified, fossiliferous limestone....
s to mill flour, grind wood into pulp for paper and grindstones

Grindstone (tool)

A grindstone is a tool used for grinding or sharpening tools.Early grindstones were made from sandstone, often in the shape of a wheel so that they could be rotated to speed the sharpening process....
to sharpen blades.

The Millstone grit is a stratigraphic

Stratigraphy

Stratigraphy, a branch of geology, studies rock layers and layering . It is primarily used in the study of sedimentary rock and layered volcanic rocks....
gritstone unit exposed in the Peak District

Peak District

The Peak District is an upland area in central and northern England, lying mainly in northern Derbyshire, but also covering parts of Cheshire, Greater Manchester, Staffordshire, and South Yorkshire and West Yorkshire....
of north central England

England

Paleozoic

The Paleozoic or Palaeozoic Era is the earliest of three geology Era of the Phanerozoic Eon . The Paleozoic spanned from roughly , and is subdivided into six period ; from oldest to youngest they are: the Cambrian, Ordovician, Silurian, Devonian period, Carboniferous, and Permian...
era, in the Carboniferous

Carboniferous

The Carboniferous is a geologic period that extends from the end of the Devonian period, about 359.2 ? 2.5 annum , to the beginning of the Permian period, about 299.0 ? 0.8 Ma ...
period, in deltaic

River delta

A delta is a landform that is created at the mouth of a river where that river flows into an ocean, sea, estuary, lake, reservoir, flat arid area, or another river....
conditions.