ami Marlborough Railways. 171 



in diameter. I never saw another pebble in the sand, and these 

 occurred at some depth below the chloritic marl, in which there 

 are sometimes small pebbles although none occur in it here. 

 The harder ends of some fish vertebrae of 3j inches diameter, were 

 found near the station. A vertebra of 3^ inches in diameter, 

 judging by a modern specimen, would indicate a shark of the 

 length af 20 feet or more. 



The passage of the Upper-green-sand into the Chalk-marl is seen 

 in the road from the station, but the fossils in the transition beds 

 are here few and unimportant. Of the Upper-green-sand, about 80 

 feet is seen, the uppermost beds being exposed in the station road, 

 and to the east of the station. In the lower beds to the west of the 

 station, Pecten orbicularis was plentiful, and Ammonites elegans. 

 Ammonites simplex, Plicatula pectinoicles, and coniferous wood pre- 

 forated by Pholas constricta, were found. 



Near Brimslade, surface deposits of sandy clay are met with, but 

 no sections of any consequence occur till we reach New Mill. In 

 the cutting here, Qrijphcea vesiculosa and Exogyra cow/ca are common, 

 Pecten quadricosfatus, Rhynconella compressa, teeth of Lamna and 

 coniferous wood were found. 



Near Milkhouse Water, covered by 3 to 5 feet of Greensand appar- 

 ently in situ, is a band of rag stone in angular fragments, sufficiently 

 small to be used for road metalling without breaking. Around 

 Burbage and Easton, the same sort of stone is found at a depth of 

 from 1 to 2 feet, and is obtained from the fields and gardens for 

 the repair of the roads. 



The cuttings between Milkhouse Water and Pewsey yielded 

 chiefly Pecten asper. Between the valves of these, spicules of 

 sponge were to be obtained, and also fragments of the network of 

 Ventriculites, and objects very much like the gemmules of sponge. 

 Sponge spicules from the Upper-green-sand seem to be quite un- 

 affected by the polariscope, while as before observed, those from the 

 chalk also siliceous are beautifully coloured. 



A few sponges occurred near Pewsey, they were generally funnel 

 shaped, the funnel becoming thinner towards the brim. Very 

 generally the sponge was encased in a hard covering of rag stone. 



