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The type of stone most suitable for making millstones is a siliceous rock called burrstone (or buhrstone), an open-textured, porous but tough, fine-grained sandstone, or a silicified, fossiliferous limestone. In some sandstones, the cement is calcareous. [42] On a historical scale, it seems that most types of rock have been used in milling.
However, such rocks are not always available, meaning that quern-stones have been manufactured from a wide variety of rocks, including sandstone, quartzite and limestone. Quernmore Crag near Lancaster in England is named after the quarrying of millstone grit used to make quern stones in these parts.
The majority of the quarrying for such use took place along the eastern edges of the Peak District. Millstone Edge was a significant source whilst abandoned millstones can be seen below the edges at Stanage, Froggatt and Baslow. Bramley Fall stone is a notable type of Millstone Grit sourced from around the village of Bramley, near Leeds. [7]
The Millstone Grit Group is a formal stratigraphic term for this sequence of rocks. The gritstone edges of the Peak District are an important climbing area and the rock is much relished by English climbers , among whom it has almost cult status and is often referred to as "God's own rock". [ 3 ]
The natural condition for the quernstone and millstone production in the area is the rock type garnet mica schist. The quarries are located from the shoreline up until approx. 200 m above sea level, but a majority is situated less than one kilometer from the sea and closest harbor.
Quartz dolerite or quartz diabase is an intrusive rock similar to dolerite (also called diabase), but with an excess of quartz. Dolerite is similar in composition to basalt, which is volcanic, and gabbro, which is plutonic. The differing crystal sizes are due to the different rate of cooling, basalt cools quickly and has a very fine structure ...
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The larger part of the national park is formed in sedimentary rocks from the Carboniferous period (359 - 299 Ma). In stratigraphic sequence i.e. youngest at the top, the sequence consists of: [3] Pennine Coal Measures Group; Millstone Grit Group; Yoredale Group (Asbian - Yeadonian) Stainmore Formation; Alston Formation (inc Gayle Limestone ...