592 ME. 0. A. SHEUBSOLE ON SOME HIGH-LEVEL [NoV. 1 898, 



level of about 308 feet above Ordnance-datum, points to a further 

 change in the phj'sical conditions at the later date indicated by the 

 lower level, inasmuch as we meet with unequivocal indications of the 

 results of glacial action. The section' shows a thickness of about 

 7 feet of a reddish and rather loamy sand, in the lower part of 

 which there is a layer of pebbles and other large material rather 

 promiscuously arranged. Besides the pebbles of Bunter character 

 there are subangular fragments of quartz, sedimentary rock, and 

 igneous rock, such as might have been derived from the wasting of 

 Boulder Clay or have been transported by ice. 



I submitted to Prof. Bonney a few characteristic pebbles and 

 three fragments of igneous rock from this section. His remarks on 

 them are as follows : — 



' 1. Slightly felspathic grit or quartzite. Might have come from 



the Bunter. 

 ' 2, 3, 4. Varieties of felspathic grit. Similar varieties occur in 



the Bunter and at Budleigh Salterton. 

 ' 5. Fine-grained quartzite. Appears identical with the liver- 

 coloured quartzite of the Midland Bunter, which I have also 

 found at Budleigh Salterton. 

 ' 6. A rather light variety of the liver-coloured quartzite, but 



with a very typical fracture. 

 ' 7. Another fine-grained quartzite. Might have come from 



either locality. 

 ' 8. Vein-quartz [purple]. Plenty like this in the Midland 



Bunter, also in the Devon pebble-beds. 

 ' 9. Appears to be a felstone. Perhaps might be Welsh. 

 ' 10. Seems to be a compact felstone, once perhaps an andesite. 



Probably Welsh. 

 ' 11. The hand-specimen is of a rather light greenish-grey colour, 

 weathering to a whitish tint, but occasionally spotted with 

 brown and similarly stained on a joint-face (from limonite). 

 If I had found this specimen in Staff'ordshire, Shropshire, 

 or Worcestershire, I should have referred it without hesita- 

 tion to Wales, probably the Arenig district. 



' Examined with the microscope, the rock proves to be a 

 devitrified rhy elite, with very well-marked iluxion-structure, 

 one constituent being slightly ferrite-stained, and in this are 

 brownish patches, due no doubt to the formation of limonite. 

 This groundmass is speckled over with a green mineral, the 

 larger flakes of which, at any rate, are a chlorite. Scattered 

 in this are a few grains of an iron-oxide and one or two 

 net very well-formed crystals of a rather decomposed felspar, 

 probably orthoclase. The slice also contains a cavity, the 

 walls of which are now covered with small crystals of quartz 

 with some felspar, and the interior is filled up by a chlorite.' 

 Prof. Bonney adds : — 



' I think that there can be no doubt that certain of the quartzites 

 are from the Bunter, or, at any rate, are the types which occur 

 there, particularly the liver-coloured, which in England, so far as I 



