258 PBocEEDmas op the geoiogical society. [Mar. 22, 



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 associated with the sandstones 

 between the Old Red Sandstone and Upper Ludlow rocks. Owing 

 to the very few exposures of rock hereabouts, it is exceedingly diffi- 

 cult to get any thing like a clear and consecutive section. Here and 

 at Putley brickyard there is a want of conformity — the only two 

 places I have noted 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 exposed here, divided by thin partings of yellow and grey- 

 coloured clay, having a total thickness of about 20 feet, with a 

 rapid dip to the north. I could detect no " olive shales" here ; and 

 the only fossils are the usual carbonized fragments of plants, including 

 the characteristic Lycopodites. Some of the blocks of sandstone are of 

 large size, and no doubt form a useful building-stone. The next expo- 

 sure of the sandstones, including the " olive shales," is at Perton, 

 which I have already referred to in a short paper published in the 

 ' Journal' of this Society* ; but as I was unable then to give a de- 

 tailed section, it may be desirable to add it now in descending order. 



ft. in. 



1. Divided beds of sandstone in thin bands 2 



2. Dark-coloured brownish shales 3 



3. Yellow sandstone 1 6 



4. Olive shales, brown and green, more or less indurated, but gene- 



rally very brittle, sandy, and slightly micaceous, and having an 

 irregular fracture 5 



5. Thin-bedded sandstone 5 



6. Olive shales, often arenacous, with a thin sandy layer at the base, 



similar in structure to No. 4 4 to 5 



Total 16 11 



I was only able to make out this section satisfactorily by the aid of a 

 ladder. The upper sandstones thin out rapidly to the south-west, the 

 *' olive shales" rising to the surface, but too high up to be reached. 



The lowest stratum (Ko. 6) crops out at the north-west corner of 

 the quarry ; and, on the authority of a man who had formerly 

 worked in it, there is a good, thick, serviceable bed of yellow sand- 

 stone underneath, though I could see no trace of it. If this should 

 prove correct, it is probably the Downton sandstone. All the sand- 

 stones are more or less fossiliferous, and yield the usual remains of 

 carbonized plants, and abundance of Lycopodites. The Crustacea 

 appear to be confined to the " oKve shales" (Nos. 4 & 6). I sent up 

 all I procured to Mr. Woodward ; and he informs me that the greater 

 number belong to Pterygotus BanTcsii, with the exception of a smaU 

 tail and three species ot Eurypterus, viz. E.jpygmceus,E.acimiinatus, 

 and E. abbreviatus. One specimen of this genus consists of a con- 

 it Quart. Joiirn. Geol. Soc. vol. xxv. p. 235, March, 1869. 



