The entrance is a broad arch formed of Twrch Sandstone ('Millstone Grit') which overlies the Carboniferous Limestone immediately beneath.
32.
The division into strips may have been to divide up equally areas with different bedrocks ( limestone, sandstone, millstone grit ).
33.
The valley floor consists of solid Millstone Grit overlain with till drift . The drainage can be described as slowly permeable and seasonally waterlogged.
34.
Where millstone grit outcropped it was quarried, mostly between the 17th and 19th centuries and is the building stone for farmhouses and boundary walls.
35.
The rock of the plateau is millstone grit, with sandstone and limestone on the flanks, and the Dent Fault ends on the western slope.
36.
The bedrock consists mainly of Carboniferous sandstones, including millstone grit, which is a major source of building material for the region's churches.
37.
On Wilders and Horwich Moors the underlying rock is Millstone Grit, and in the intermediate slopes are found the Lower Coal Measures of the Lancashire Coalfield.
38.
At least of sandy gravels are recorded, consisting of limestone clasts mainly, but also with Millstone Grit, Pennant Sandstone, flint and chert clasts.
39.
Many years ago, at its north-eastern end, deep glacial striatums on the Millstone Grit ran straight down the shallow valley towards Caernarfon Bay.
40.
There are many variations of rock formations, caused by Millstone Grit being eroded by water, glaciation and wind, some of which have formed amazing shapes.
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