75 



Some deposits of stratified gravels, sands and clay, varying in 

 thickness from a few feet to over twenty teet, are spread out over 

 the plateau of Hendon, Finchley, Whetstone, and other parts of 

 Middlesex. They are frequently covered over by the chalky boulder-clay 

 containing northern erratics. — 21. 



Glacial gravels occur at Ealing, in Middlesex, 180 feet to 210 

 feet above O.D. They contain quartz, quartzite, various green- 

 stones, granite, carboniferous limestone, cherty limestone, red 

 sandstone, upper oolite, forest marble, lower greensand, hard chalk, 

 tabular and nodular flint, Sarse?i stones, etc. — 22. 



Mr. Osmond Fisher has observed many such gravels, capping 

 the brick-earth, at Ilford, at Grays Thurrock, &c, which he 

 believed to be the trail of land ice. — 23. 



At Wokingham, in Berks., are much-contorted clays, with 

 boulders of (frozen) gravel driven into them. Mr. Irving derives 

 the gravel from the older plateau-gravels. 



Mr. Monckton said that such contortions are generally accepted 

 as evidences of snow or ice ; and Mr. Rupert Jones declared that 

 similar conditions existed at Cuckmere and were the effects of 

 ice-action. — 24. 



The highest point of the Cotteswold Range, 1,134 ^ eet above 

 O.D., carries northern drift and boulder-clay. — 25. 



The Mendips are remarkably free from drift, but there are 

 some deposits of loam and clay, and a few boulders of old red 

 sandstone and millstone grit which cannot well be accounted for 

 by the action of rain, river or sea. — 26. 



On the east side of Dartmoor beds of gravel reach 1,200 feet, 

 with clays and transported boulders. On the top of Little Haldon, 

 Devon, 800 feet above O.D., the gravel is ten feet thick, and 

 palaeozoic pebbles, and chalk-flints and chert. The Haldons and the 

 Blackdowns of Devon are greensand outliers. The latter are 

 700 feet above O.D. and are covered with pebbles of chert, quartz, 

 rolled flint, and scantily of quartzite. — 27. 



On Woodborough Hill, Devon, are extensive deposits of 

 gravel derived from the higher drifts. Further west, evidences of 

 glacial action, more or less reliable, have been cited by various 

 authors, and deposits of gravel have been noticed up to 900 feet 

 above O.D.— 28. 



The drift beds of Devon and Cornwall have been divided by 

 Mr. Belt into upland and lowland deposits. 



I. The upland deposits, 300 feet to 1,200 feet above O.D., consis* of gravels, 

 clays, and transported boulders left in fragmentary patches, and have 

 evidently had, at one time, a much wider extension. 



21 — Hicks. Glac. Mag., ii., 14. 

 22 —Allen Brown. P.G.A., viii., 173-5-8. 

 23 — Ibid. 

 24 — Q.J.G.S., xlvi., 561-3. 

 25 — Ibid. p. 8-9. 

 26 — Horace Woodward. Geol., p. 316. 

 27— Thos. Belt. Q.J.G.S., xxxiii., 82-4. 

 28— Salter. P.G.A., xv„ 283. 



