found: Work cat.: Abesser, C. Baseline report series. 18, Millstone grit of Northern England, c2005:p. 5 (The Carboniferous rocks include Carboniferous Limestone, Millstone Grit and coal measures and can be broadly equated with the chronostratigraphical (time) divisions Dinantian and Silesian)
found: OED online, Dec. 12, 2008(Millstone grit; hard siliceous rock suitable for making millstones; spec. (freq. Millstone Grit) a coarse sandstone of the British Carboniferous)
found: Wikipedia WWW site, Dec. 12, 2008:Gritstone (Gritstone - otherwise called Millstone grit ; a sedimentary rock composed of coarse sand grains with inclusions of small stones; it was laid down in the late (upper) Paleozoic era, in the Carboniferous period, in delta conditions)
found: OED online, Dec. 12, 2008:Grit, n.1, 2a (Coarse sandstone, esp. of the kinds used for millstones and grindstones; gritstone)
found: Britannica online, Dec. 12, 2008:Sedimentary rock (Subarkose sandstones, e.g. Millstone Grit)
