88 GEOLOGY. 



Bunter. The total thickness probably lies between 2500 and 3500 

 feet. W. T. 



Ussher, W. A. E. On some old Gravels of the River Dart, between 



Totnes and Holne Bridge. Trans. Devon Assoc, vol. viii. pp. 427- 



433, plate (sections) and woodcut. 



Directs atticntion to the gravels and boulders near Totnes, which 



show that the Dart flowed at a higher level ; and suggests that the 



volume of water was in former times greater, and enough to excavate 



a gorge over 60 feet deep through the slate rocks. T. M. H. 



Verini, William. Section of the Strata passed through in boring 

 at the Colne Valley Waterworks. Trans. Watford Nat. Hist. Soc. 

 vol. i. pt. 5, p. 135. 



Depth 235 feet in 6 beds of variable chalk. 



Walker, Henry. Excursion to Bromley, Sundridge Park, and Chisle- 



hurst. Excursion to Crayford. Excursion to Kiddlesdown. Proc. 



W. Lond. Sci. Assoc, vol. i. pt. ii. pp. 71-73, pp. 74-76, pt. iii. 



pp. 84-90. 



1. Woolwich Beds, Oldhaven Bods, and London Clay were examined. 



2. List of Pleistocene mammals. A mammoth-tusk, 7 feet long, and 



other bones and shells were found. 3. Notes on the Chalk Downs 



near Croydon, the perennial hill-top ponds, and the Croydon Bourne. 



W. H. D, 



Ward, J. C. The Geology of the Northern Part of the English Lake 

 District. With an Appendix on New Species of Eossils by R. 

 Etheridge (seepost, under Invertebrata). Pp. xii, 132 ; 13 plates 

 (microscopic rock-structure, maps, sections, views, and fossils). 

 Geological Survey Memoir. 8vo. London. 

 Chap. i. Physical Geography, ii. General Description of the Rocks. 

 iii. Skiddaw Slate, iv. Volcanic Series of Borrowdale. vi. Igneous 

 Rocks, vii. General Position and Lie of the Rocks, viii. Eaults. 

 ix. Mineral Veins (Lead, Copper, Iron, Barytes, Cobalt, Nickel, and 

 Antimony), x. Graphite, xi. Cleavage, xii. Original Relation of 

 the Eormations to each other, and their Physical History, xiii. Gla- 

 cial Phenomena, xiv. Relation of Scenery to Geology, xv. Fossils of 

 the Skiddaw Slates (lists of species and localities). Appendix B. Bib- 

 liography of the District. The analyses of rocks in chaps, iii.-vi. are 

 by J. Hughes ; those in chaps, ix. and x. are quoted. W. H. D. 



— — . On the Granitic, Granitoid, and Associated Metamorphic 



Rocks of the Lake-District. Parts III.-V. . Quart. Journ. Geol. 



Soc. vol. xxxii. pp. 1-34, pis. i., ii. (microscopic rock-sections) ; 



3 woodcut maps. 



Part III. On the Skiddatu Granite and its associated Metamorphic 



Rocks, pp. 1-11. The metamorphism of the Skiddaw Slates begins 



with the appearance of small spots which, further towards the granite, 



change into chiastolite crystals. This chiastolite-slate changes into 



