The Quarterly journal of the Geological Society of London . lyhead road about two miles east of Glyndyfrdwy. The woodedspur Wriddiog is physiographically a continuation of this ridge, oncemore bent round so as to run towards the north. IV. The General Sequence. At the northern end of the spur which runs north from MoelFerna the pale shales of the Tarannon series are succeeded by darkbanded slates,2 which have been extensively worked at the Penarthquarries of Pen-y-glog near Carrog. They have been already fre-quently described, and contain Monograptus personatus, M. priodon,Retiolites Geinitzia
The Quarterly journal of the Geological Society of London . lyhead road about two miles east of Glyndyfrdwy. The woodedspur Wriddiog is physiographically a continuation of this ridge, oncemore bent round so as to run towards the north. IV. The General Sequence. At the northern end of the spur which runs north from MoelFerna the pale shales of the Tarannon series are succeeded by darkbanded slates,2 which have been extensively worked at the Penarthquarries of Pen-y-glog near Carrog. They have been already fre-quently described, and contain Monograptus personatus, M. priodon,Retiolites Geinitzianus, etc. 1 This is unnamed in the ISfew Series of 1-inch Ordnance maps. It is thespur which projects into the V-shaped bend in the Holyhead road shown onthe map. 2 These slates are usually known in geological literature as the Pen-y-glogSlates, from the name given to the hill on the old Ordnance maps. The name Pen-y-glog is, however, almost unknown in the district; and the quarries,which are now no longer worked, were called the Penarth slate-quarries. V. * Q5 S* P hs M 14 ME. PHILIP LAKE ON THE DENBIGHSHIRE [Feb. 1895, ts 5*1 Pi CQ fe S t=3fi .Sfi These slates are followed by a grit, which forms the upper partof the quarry, and which may be traced southward along the ridgeof Moel-y-Gwynt to the top of Moel Ferna. There it bends roundeastward and forms the crest of the watershed between the Dee and the Ceiriog until it is lost in theheather, which covers everything eastof the road from Glyndyfrdwy toNantyr. No doubt it still continuesunder the heather, probably in asomewhat attenuated form, for a gritappears in the same stratigraphicalposition a few miles farther east, alittle way north of LlansaintffraidGlyn Ceiriog. On Moel Ferna the grit dips be-neath slates, which are exposed avery short distance east of the summitand lower down on the eastern flanksof the hill are worked in the quarriesknown as the Moel Ferna slate-quarries. They closely resemble thePeu-y-glog Slates, con
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Keywords: ., bookcentury1800, bookdecade1840, bookidquarte, booksubjectgeology
