INDEX. 



577 



Chalk, arguments in support of the organic origin of 

 the siliceous bodies of the, 181 et seq. 



description of remains of a bird, a tortoise 



and a lizard from the, 411. 



remarks on the origin of pits in, 448. 



proofs of the extension of, to South Devon, 



449. 



Channel Islands, remarks of the relative position of 

 the trap and associated formations in the, 563. 



Cherbourg, Rev.W. B. Clarke on the geological phae- 

 nomena in the immediate vicinity of, 563. 



Cherts, on the organic origin of, procured from green- 

 sands, 189. 



proofs adduced in support of, 



189. 



Chiloe, description of the erratic boulders and asso- 

 ciated deposits on the north and east coasts of the 

 island of, 423. 



remarks on the proba- 

 ble position of the parent rock, 424. 



no boulders observed in the interior or on 



the western coast, as far as visited, 424. 

 remarks on the position of the boulders on 



the extreme northern point of, 425. 

 direction of ancient marine 



currents over portions of the island of, 425. 

 probable age of the boulder 



formation of, 426. 

 Chudleigh, remarks on the relative position of the 



culm series near, 458. 

 Chudleigh rock, account of the relative position of 

 the carbonaceous deposits and slates in a well 

 opposite, 460. 

 Cintra, notices of the formations in the neighbour- 

 hood of, 119, 120, 122, 123. 

 Cirrus, description of new species from PafFrath, 365. 

 Clausthal, description of the section from, to Griind, 

 288. 



description of the section from Osterode 



to, 288. 

 Clarke, Rev. W. B., on the geological structure and 

 phsenomena of the northern part of the Cotentin, 

 particularly in the immediate vicinity of Cher- 

 bourg, 563. 

 Cleavage, remarks on the, of the South Devon rocks, 



479. 

 instances of, among curved strata, 481. 



Cleavage, phasnomena connected with, not observable 

 in South Devon above the carbonaceous series, 

 482. 



Clift, W. Esq., notices of his description of remains 

 of the Megatherium brought to England by Sir 

 Woodbine Parish, 83. 



Clyde, on the relative ages of the tertiary and post- 

 tertiary deposits of the basin of the, 153. 



Cnidus, description of the promontory of, 9. 



Coal, account of subsidences produced by working 

 beds of, 165. 



circumstances on which 



their extent depends, 165. 



by short working, 166. 



— — by long working, 166. 



signs of, 166, 167. 



instances of, 167- 



notice of a seam of, at the base of the carboni- 



ferous limestone in Denbighshire, 195. 

 — remarks on the origin of the seams of, 1 79. 



Coal-boulders, account of, in the Pennant grit of 

 South Wales, 495. 



Coal-measures, casts of arborescent plants found 

 in, supposed to have been solid-wooded trees, 

 179. 



Westphalia, description of, 228. 



lower coal tract analo- 

 gous to culm districts of Devon, 229. 



of South Wales, notice of the enor- 



mous thickness of, 491. 



der-clay of, 491. 



account of the un- 



• boulders 



of coal in the Pennant grit of, 496. 

 observations on the 



great period of time which must have elapsed in 



the accumulation of the, 495. 

 Coast of England, remarks on the connexion of the 



physical phsenomena presented along the south 



coast of, with those on the opposite coast of 



France, 566. 

 Coburg, account of the formations between Saalfield 



and, 297. 

 Coleford High Delf coal-seam, account of the Horse 



fault in the, 215. 

 Combe Farm, notice of the greensand strata near, 



451. 



