On a Second Precambrian Group in the Malvern Hills

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Abstract
T he Herefordshire Beacon, situated a little south of the middle of the Malvern range, sends out towards the east and south-east several buttresses or spurs; they occupy an area of about one mile from north to south and half a mile from east to west. In the summer of 1878 I visited the Malvern Hills to compare the rocks with those of Shropshire, and I was sanguine, from Dr. Holl's description of this district, that I should find in it some equivalents of the younger Precambrian group of that county. In his valuable and thoroughly scientific memoir on the Malvern Hills, published in the Journal of this Society in 1865, Dr. Holl describes the area in question as “occupied by baked rocks* of the probable age of the Hollybush Sandstone and Black Shales,” the alteration of the rocks being supposed to be due to immense trap-dykes—a very natural interpretation of the facts when we consider the vague ideas of petrology and of metamorphism which prevailed 15 years ago. On my first visit I had the advantage of Dr. Holl's guidance. I found that he had advanced beyond his original position, and was quite prepared to consider a new reading of the district. I saw at a glance that the rocks were quite of a type with which I had been familiar in Lilleshall Hill, the extreme north-easterly summit of the Salop Precambrian chain. The prevailing variety is a very compact, flinty, hornstone † (note 1, p. 538) of a grey

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