Vol. 56.] 



LNLIEK AT HUNTLEY. 



515* 



partings and thin beds of soft grey shale. The dip is 70° south- 

 westward. The May Hill Sandstone in other parts of the district 

 is also predominantly siliceous, and often contains numerous bits of 

 purple felsite, very similar to typical Uriconian. Many years ago, 

 I found in a quarry (now overgrown) on May Hill some conglo- 

 meratic beds in which were pieces of grey shale, undistinguishable 

 from the Shineton Shales of Malvern and Shropshire ; and it would 

 seem probable that the shaly partings in the garden-quarry are 



Section of Longmyndian and associated rocks at Huntley. 



s.W 



May HlLL Covered Ground 

 Series 



Longmyndian j Tr 

 fault 



I A S 



derived from the same source. The May Hill Series is therefore 

 largely derived from land consisting of quartzose rocks, purple 

 rhyolites, and soft shales, an assemblage which offers a strong con- 

 trast to the constituents of the Huntley Grit. The materials of the 

 latter include so large a proportion of broken and unbroken felspar- 

 crystals as to indicate an admixture of the ejectamenta of con- 

 temporary volcanoes, a common feature in the Shropshire Long- 

 myndian, but one which is not known in our Western Midland 

 Silurian. 1 



The tectonic relations of the Huntley Grits and the May Hill 

 Sandstone could not be ascertained. The Silurian rocks of the 

 district lie in a boat-shaped anticline, whose axis strikes north- 

 westward, but the eastern part is cut off by a north-and-south fault, 

 bringing down the Keuper. The position of the Longmyndian is 

 about on the axis of the anticline, and close to the Keuper. The 

 fault is apparently a continuation of the dislocation which forms 

 the eastern boundary of the Malvern crystallines. This little north- 

 and-south ridge of Longmyndian is approximately on the prolon- 

 gation of the geographical axis of the Malvern chain, and, like the 

 greater part of that range, has May Hill Sandstone on one side, and 

 faulted Keuper on the other. As these Longmyndian strata strike 

 north and south, it seems probable that they are continued north- 

 ward, and underlie the Cambrian and newer strata of the Malvern 

 district. 



The identification of these outlying masses of Longmyndian rocks 

 enables us to make a considerable extension of the distribution 



Of course, I do not include the ' Lower Silurian ' of Murchison. 



