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appear above it. Three miles to the north, on Putley-common, near Maine a- 

 wood, other beds of a close-grained more or less quartzose Sandstone occur, in 

 which I found the cast of the larger form of Linguta cornea ; this seems to 

 correspond with the hard micacous grit (though there of a purvde colour) at 

 the Tin Mills, Downton, which immediately overlies the " Olive Shales," ami 

 there contains the Lingula cornea in abundance. The beds were much disturbed, 

 and more or less inclined, as most of the beds are here dipping from the older 

 Silurian rocks of Woolhope, and in the same direction, for the most part, on this 

 side. The partial opening was of no great depth, and therefore the thickness 

 of the Sandstone visible was of limited extent, but, judging from the relative 

 position of the sandstone formation on the west, and the Old Eed Sandstone 

 on the east, the thickness would perhaps be considerable it fairly exposed. 

 A mile or two towards the north-west, near Lower Marcle, between this spot 

 and TarriDgton, is a small quarry of thick -bedded variable Sandstone, charged 

 with the usual carbonaceous remains, but finer-grained than those already 

 described. On the same line, still further towards the north-west, on the brow 

 of the rising ground called "Hillfoot," similar bands of Sandstone are exposed, 

 more or less disturbed, dipping towards the north-east, and underneath them 

 the " Olive Shales," three or four feet thick, passing into and resting on a thin 

 stratum of Sandstone similar to the section at Perton. The Shales are hori- 

 zontal and contain in the lower part abundant fragmentary remains of plants, 

 among which are the seed vessels of Lycopodium and larger fruits which seem 

 to be quite distinct. I could find no Crustacea, but a longer and careful search 

 would no doubt detect them. I also obtained one specimen of the smaller 

 form of "Lingula cornea,'''' supposing this species to be identical, which Mr. 

 Symonds thinks it is not. In no other places where the Sandstones are present 

 have I observed these Shales except here and at Perton, but probably, though 

 not exposed elsewhere, they extend for some distance in this district, and are 

 to be looked for between the Old Red Sandstone and upper Ludlow rocks. 

 Owing to the very few exposures of rock hereabouts it is very difficult to get 

 anything like a clear and consecutive section. Here and at Putley brick-yard 

 there is a want of conformity, the only two places I have observed this, for as a 

 general rule the passage beds are conformable to the Upper Silurians. About 

 two miles further on is the better-known quarry at Tarrington. Six to eight 

 beds of Sandstone varying in thickness, colour, and lithological character are 

 here seen divided by thin partings of yellow and grey coloured clay, having a 

 total thickness of about twenty feet, with a rapid dip to the north. I could 

 detect no Olive Shales here, and the only fossils are the usual carbonized frag- 

 ments of plants, including the characteristic Lycopodites. Some of the blocks 

 of Sandstone are of large size, and would no doubt form a useful building 

 stone. The next exposure of the Sandstones, including the "Olive Shales," 

 is at Perton, a mile and a half distant to the east, which I have already referred 

 to in a Bhort paper published in the Geological Journal (vol. xxv., part 1, 



