Millstone Grit
Towards the western margins of the Peak District are a rather more broken series of edges, facing in a variety of directions, from those surrounding the high plateaux of Kinder Scout and Combs Moss to the imposing crags of the Roaches, Hen Cloud and Ramshaw Rocks in the south.At the Yorkshire Dales they cover the south-east edge, but north of the Craven Faults, due to weathering, they form only cappings to separate hills.The term has also been adopted at Slieve Anierin in northwest Ireland, describing the series of shales, grits, and coal seams, occurring from the base of the Namurian upwards.One particular east-west aligned landmass stretched from Wales through the English Midlands and East Anglia to the continent and is now known as the Wales-Brabant High, though was formerly referred to as St George's Land.Rivers running north off the Wales-Brabant High deposited material in the southern parts of the Pennine basin from northeast Wales to the Peak District.During much of the Carboniferous Period, world sea-levels were fluctuating in response to the growth and decline of a series of major ice-caps over the continents then clustered around the South Pole.[4] The Millstone Grit Group comprises over thirty individually named sandstones, some of regional extent, others more local in their occurrence.The closing sub-stage of the Namurian, the Yeadonian includes the Lower Haslingden Flags and the last sandstone in the entire Millstone Grit succession known as the Rough Rock.
Derwent EdgePeak DistrictsandstonesCarboniferousBritish IslesmillstoneswatermillslimestonemudstonesSeriesgritstonePenninesIrelandsiltstonesescarpmentsplateauxStanage EdgeDark PeakcountiesDerbyshireStaffordshireCheshireBleaklowBlack HillBamford EdgeBurbage EdgeFroggatt EdgeCurbar EdgeGardom's EdgeBirchen EdgeKinder ScoutCombs Mossthe RoachesHen CloudRamshaw RocksSouth PenninesLancashireWest YorkshireForest of RossendaleWest PenninesForest of BowlandYorkshire DalesCraven FaultsweatheringFlintshireWrexhamShropshireOswestryMarros GroupSouth WaleslithologyBritish Geological SurveyFarewell RockSouth Wales Coal MeasuresSlieve AnierinNamurianPeriodEnglish MidlandsEast AngliaWales-Brabant HighPennine BasinSouth Polemarine bandsPendle GritPendleianRoaches GritAshover GritRough Rockdry stone wallsBramley Fall stoneaquifersaggregateclimbingWikisource