vol. xx. (3) THE SILURIAN ROCKS OF MAY HILL 191 
almost entirely of rounded quartz grains, but also contains a 
few small rounded felsitic fragments. 
This rock is certainly different in appearance to the main 
beds in or near the Huntley Quarry, but it is of the same type 
of coarse grit, and some of the bands in the Huntley Quarry 
rock are not very different from it in a hand specimen. 
Dr. Callaway describes a section of a specimen from the 
Huntley Quarry as showing a rock “ mainly composed of 
felspar, with quartz in quite subordinate proportion. The 
former includes both orthoclase and plagioclase. Some of it is 
in unbroken prisms, the remainder being in rregular fragments. 
The quartz is also in angular bits. The slide contains a fair 
proportion of a black opaque substance in irregular particles, 
many of which contain minute elongated prisms of felspar, 
suggesting a partly decomposed dolerite . 1 
He considers that this does not show a close similarity to 
any rock of the Longmynd Series. But he argues that the 
rock is so dissimilar to the undoubted Llandovery Sandstone 
which he found in an exposure (now overgrown) 200 yards to 
the south-west, that he classes the Huntley Quarry rock as 
Longmyndian. 
The Llandovery rock is, he says, predominantly siliceous and 
often contains bits of purple felsite ; the Huntley Quarry rock 
includes so large a percentage of broken and unbroken felspars 
that it shows an admixture of the ejectamenta of contemporary 
volcanoes, “ a common feature of the Shropshire Longmyndian, 
but one unknown in our western Midland Silurian.” 
He states that the May Hill Silurians lie in a boat-shaped 
anticline whose axis runs north-westwards, and that the Huntley 
Quarry rocks lie about on the axis of this fold. 
Taking these arguments in the above order, one has first to 
remark that Dr. Callaway was probably somewhat unfortunate 
in his selection of the particular band from which he had his 
section cut. Of six sections cut from various types of rock 
occurring either in the quarry or by the roadside to the west 
of it, not one of them can be described as “ mainly composed 
of felspar with quartz in quite subordinate proportions.” 
1 Quart. Journ. Geol. Soc.. vol. Ivi. (1900), p. 518. 
