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destitue of organic remains,but he mentions two exceptions, first, 
the Pachyrisma bed at Bussage and Cowcombe, at the base of 
the Limestone, in which that shell, two species of Natica, and 
two of Purpuroidea are abundant,—and secondly, a single 
locality east of Minchinhampton, where the uppermost bed of 
the series, described as a sandy buff-coloured rock, contains 
Pholadomya socialis, Lucina Bellona, Ceromya concentrica, C. 
Symondsii, C. undulata. Cyprina Loweana, Purpuroidea Morrissti, 
P. nodulata, Nerita rugosa, Nerinea funiculus, Alaria armata, 
A. paradoxa, Cardiwm pes-bovis, and Goniomya litterata, in greater 
or less abundance. It is singular that our Nerinea bed, which 
is exactly on the same horizon, contains a larger assemblage of 
shells, but all except two, or at the utmost three, are of different 
species. The existence of these beds of fossils on the same 
horizon but some five miles distant from each other, suggests 
the probability that other like assemblages occur in the sur- 
rounding neighbourhood, and that the close of the Limestone 
period was marked by an accumulation of shells in patches on 
the floor of the Oolitic sea, constituting a zone of life not 
altogether identical with that of the period of the shelly 
Weatherstones, which preceded the formation of the Limestone. 
A mile beyond Tiltup’s End, on the Bath road, and near 
Calcot Barn, there is a small quarry, used for obtaining road- 
stone. Itis about ten feet deep, of which the lower five feet 
consist of thick compact beds, which at first sight somewhat 
resemble the White Limestone, but on closer examination they 
are found to differ in structure and colour, and are identical 
with the lower beds of Forest Marble at Tiltup’s End. The 
formation is coloured “Forest Marble” on the Geological 
‘Survey Map. From the resemblance of these beds to those at 
—‘Tiltup’s End I have no doubt that they occupy a similar 
‘position, and that the White Limestone is beneath. It confirms 
the opinion I have before expressed that the Forest Marble of 
‘this area was originally thick bedded and not fissile, as it is 
usually seen in the neighbourhood of Cirencester. 
All the fossils in these beds are either in the form of casts 
or are so highly crystalline as to defy almost every effort to 
