INDEX. 



507 



Dolomite, Arenaceous, a principal bed of the yel- 

 low magnesian limestone in Nottinghamshire, 

 Derbyshire, and Yorkshire, 82. 



contortions of, near Nice, ascribed to 



the uplieaving of the Alps by igneous rocks, 

 184. 



description of the, and light-coloured 



limestone near Nice, 182. 

 considered as equivalent 



of the Jura limestone of the Western Alps, 183. 

 . remarks on the chemical composition 



of, 85 and tiote. 

 small-grained, a variety of the yellow 



magnesian limestone, most perfectly developed 

 in the quarries between Nottingham and Bram- 

 ham Moor, US. 



Dolomitic conglomerate in the South-west of En- 

 gland represents the five lowest divisions of the 

 new red sandstone series of the northern coun- 

 ties, 122. 



of Bristol considered con- 

 temporaneous with the overlying conglomerates 

 of Devonshire and Somersetshire, 122 note. 



of Somersetshire and 



Devonshire considered equivalent to the higlier 

 portions of the Thuringerwald system, 122. 

 strata of the new red sandstone, on the 



occurrence of Agates in the, 421. 



Don, description of the magnesian limestone on 

 the banks of the, 93. 



Doncaster, account of great fault south of, 113. 



Dreystetten, section of the overlying deposit near, 

 365. 



Dunbeath, fossil fish found in blue calcareous flag- 

 stones, near, 137. 



succession of beds between, and Brae- 

 more, 138. 



Duncansby Head, dislocations of, 134. 



■ section from, to the granite of 



the Ord, 135. 



Dunnet Head, strata of which it is composed, 133. 



upper red sandstone of, exact rela- 

 tions doubtful, 157. 



Durham coal-field, south-western extremity of the, 

 deposited in form of an irregular trough, 59. 



drainage of the county of, 41. 



Durham, Professor Sedgwick on the geological re- 

 lations and internal structure of the magnesian 

 limestone, and the lower portions of the new red 

 sandstone series in, 37. 



Earth, changes in orbit of, which would account 

 for material changes in the botanical character 

 of a country, 298. 



decrease in the excentricity of the orbit, 



would account for a general refrigeration of cli- 

 mate, 295. 



extreme effects which a variation in the 



excentricity of the orbit of, might produce in 

 the summer and winter months of particular 

 regions, 297. 

 the effects which an orbit as excentric as 



that of Juno or Pallas would produce, 298. 

 — — orbit of the, as far as yet investigated, may 



have been elliptical to any amount, 296. 

 period requisite to change an orbit from that 



of Juno or Pallas, to that of the, at present, ac- 

 cording to the actual rate of diminution, 298. 

 — — phaenomena which a change in the orbit of 



the, would account for, 295, 298. 

 variations in the obliquity of the ecliptic, 



too small to have ever produced any sensible 

 effect on the climates of the, 299. 



Earthquake, notice of, at Lahore, in February, 

 1832, 492. 



in the valley of Badakh- 



shan in 1832, 494. 



Earthy magnesian limestone, description of, 87. 



Eastern Alps : see Alps. 



Easter Ross and Cromarty, sandstone of, partly 

 identical with the middle system of Caithness, 

 150. 



East Thickley, notice of fossil fishes found at, 1 1 G. 



Eden, beds of conglomerate in the valley of the, 

 identical in position and mineralogical character 

 with the overlying conglomerates of the Somer- 

 setshire coal-field, 55. 



new red sandstone of the denudation of the, 



unconformable to the older formations, 55. 



Ehrenhausen, description of the tertiary forma- 

 tions in the neighbourhood of, 388. 



