266 



MR. E. WITCHELL ON THE BASEMENT-BEDS 



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TJley Bury. 



. SelsleyHUl. 



Haresfield 

 Hill. ' 



Painswick 

 Hill. - 



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Birdlip.- 



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the Pea Grit so far as Selsley 

 and Nails worth, but this exten- 

 sion is, however, beyond all 

 doubt. I have traced it along 

 the escarpment at the follow- 

 ing points : Painswick Hill, 

 Horsepools Hill, Haresfield 

 Hill, Eandwick Hill, Selsley 

 Hill, and Coaley Wood adjoin- 

 ing Uley Bury, the last-men- 

 tioned place being 13 miles 

 distant from Birdlip ( fig. 1 ). In 

 the valleys which intersect the 

 Cotteswolds in the neighbour- 

 hood of Stroud the beds can 

 also be traced ; sections of Pea 

 Grit can be seen at Stroud, 

 Eodborough Hill, Nailsworth, 

 Horsley, and in the Golden 

 Valley above Chalford ; but in 

 the latter locality the beds are 

 only pisolitic or, rather, marly 

 limestone. The section at 

 Longford's Mill, near Nails- 

 worth, contains a bed of Pea 

 Grit in which the grains are in 

 a soft marly paste, overlying 

 a bed of pisolitic limestone 

 charged with several species 

 of NerlncBa, the whole being 

 about five feet thick. At Hors- 

 ley it is a pisolitic limestone 

 with pockets of Pea Grit ; its 

 thickness is about three feet. 

 At Coaley Wood it is reduced 

 to nine inches, and has lost its 

 ferruginous character except 

 at its base, where there is a 

 thin layer of ferruginous sand. 

 The three last-mentioned places 

 are the furthest points from 

 Birdlip towards the south-west 

 at which the Pea Grit has yet 

 been observed. Wherever it 

 preserves its ferruginous aspect 

 it presents a striking contrast 

 to the beds above and below; 

 and as the difference in struc- 

 ture is equally striking, there 

 need not be any confusion in 



