Lambert M. SurhoneISBN: 978-3-6399-9952-5;
The Roaches Grit is a coarse sandstone which outcrops widely throughout the western part of the Peak District of northern England and gives rise to several significant landscape features in the area. Its counterpart in the eastern part of the National Park is the Ashover Grit. The combined Roaches Grit and Ashover Grit are amongst the most widespread sandstone units within the Millstone Grit Group of the Peak District. Along with other similar sandstones, such as the immediately overlying Chatsworth Grit, it is assigned to the Marsdenian sub-stage of the Namurian stage within the Carboniferous period. The two units which, prior to the doming and erosion of the central Peak District were once one, are interpreted as delta-top sandstones. The deposited material was brought down from a northerly source by braided rivers.
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