No fossiliferous strata unequivocally of Lower Cambrian age occur within the limits of the Birmingham District; but strata of Upper Cambrian age are met with in several localities. They were first recognised by Professor Phillips in the area of the Malvern Hills, and have been subsequently detected within the last few years at the Wrekin, at Nuneaton, and in the Lower Lickey Hills. MALVERN HILLS.--The Upper Cambrian beds of the Malverns rest upon the crystalline rocks of the axis of the hills to the south of Herefordshire Beacon, along the slopes of Midsummer Hill and Keys Hill. The lowest zone is the _Hollybush Sandstone_, a light green micaceous rock, containing tubes of sea worms and _Kutorgina cingulata_. The Hollybush Sandstone is succeeded by shivery shales, somewhat sandy below, and becoming darker and more carbonaceous above. In their lower beds they yield:--_Obolella Salteri_, _Obolella sagittalis_, _Lingula pygmea_, _etc._ In their middle beds they afford _Pellura scarabeoides_, _Spheropthalmus alatus_, _Agnostis pisiformis_, _Agnostus trisectus_, etc., well-known fossils of the Upper Lingula Flags (Dolgelly) of North Wales. Their highest beds contain _Dictyonema sociale_, a fossil which passes up into the succeeding Tremadoc Slates. The rest of the local succession of the Cambrian rocks is hidden by the unconformable overlap of Silurian. The Hollybush Sandstone and the overlying sandy shales contain numerous intercalated volcanic rocks, some of which are of the age of the surrounding strata, while others are intrusive. NUNEATON DISTRICT.--In the neighbourhood of the town of Nuneaton in eastern Warwickshire, a strip of Cambrian rocks, about eight miles in length by one in breadth, has been detected within the last few years. The rocks consist of volcanic ashes, quartzites and thin-bedded shales, pierced by dioritic dykes. These strata were formerly mapped as altered Millstone Grit and Carboniferous shale, and their Cambrian age has only been recently demonstrated by the discoveries of Birmingham geologists. The complete succession is as follows:-- (1.) CALDECOTE VOLCANIC GROUP.--Well-bedded tuffs and volcanic ashes (see _ante_) with masses of Quartz-felsites and diabase. (2.) HARTSHILL QUARTZITE.--Thick-bedded quartzites, with occasional layers of sandy shale. (3.) STOCKINGFORD SHALES.-- (_a._) _Lower Division._--(_Obolella Beds_) Purple and green shales with _Obolella Salteri_, _Lingulella pygmea_, _Lingulella lepis_, _Acrotreta_, _Protospongia_, &c. (_b._) _Upper Division._--(_Agnosias Beds_) Grey and black shales with _Agnostus pisiformis_. _Beyrichia Angelini_ and _Lingulella Nicholsoni_, in the lower zones, and _Spheropthalmus alatus_ and _Dictyonema_ in the upper zones. These Cambrian rocks are overlain unconformably by the Coal measures to the west, and by the Keuper beds to the east; the boundary of the area is, however, locally defined by lines of fault.