494 



INDEX. 



Fishes, fossil, of the Portland stone, 261, 300. 



Portland sand, 231. 



Kimmeridge clay, 232, 303. 



Fissile sritstone and carbonaceous shale, descrip- 



tion of beds of, between Strong Post and 



Mosdale limestones, 75. 

 . , Mosdale 



Moor and Four-fathom limestones, 77. 



-, most important of the groups al- 



ternating with the limestone series, near Pe- 



nigent, 77. 



, subdivisions of, 77. 



, used as roofing-slate, 78. 



, contains two beds of coal, 78. 



Fitton, William Henry, M.D. P.G.S., " On Strata 

 between the Chalk and Oxford-oolite in the 

 South-East of England," 103. 



, objects and 



plan of his paper, 104, 105. 



_ , table of its 



contents, 384* 



finds the 



"dirt-bed" of Portland in the Boulonnois, 15, 

 note. 



Fitton, W. J., remarkable specimen of Ammonites 

 found by, 152. 



Flints, accumulations of, due to the action of 

 water, 6. 



Flinty slate, fragments of, in the conglomerates of 

 the Lower green-sand, 117. 



Flookborough Spaw, conglomerate of new red 

 sandstone unconformable to mountain limestone 

 near, 389. 



Flora of the lignite of Bonn, not yet explored, 

 451, 464. 



Fog, remarkable appearance in, from the Hogs- 

 back, Surrey, 149, note. 



Foliated-sand, and clay, remarkable alternation 

 of, 168. 



Folkstone, vicinity of, strata described, 105. 



, coast near, view of, (Plate VIH.), 



106. 



Forest marble, description of, in the Vale of Wey- 

 mouth, 28 ; fossils of, 29 ; its extent, 29. 



and cornbrash closely united in 



the Weymouth district, 3, note. 



Fossils of strata from chalk to Oxford-oolite, lists 

 of explained, 112, note. 



, local 



distribution of: see the Names of Counties, — 

 Kent, Surrey, Sussex, &c. 



de- 

 scribed in Dr. Fitton's paper, deposited in the 

 Geological Society's Museum, 334, note. 



, new 



species of,(Plates XI. to XXIII.), Mr. Sowerby's 

 descriptive notes upon, 375. 



, col- 

 lections of, defective, 334. 



, lists 



of, general inferences not safely deducible from, 

 334. 



-, varia- 



tion of, within short distances, 334. 



, syste- 

 matic and stratigraphical Tables of, 351 — 368. 



, explanation of the Tables, 350. 



Fossil remains of the Loess of Bonn, 161, 462. 



Fossil trees in the Isle of Portland, 13, 217, et seq. 



Foundations of geology, are accurate mineralogi- 

 cal distinctions, and order of superposition, G7. 



Four-fathom limestone, description of, 78. 



variable in thickness, 78. 



abounds in encrinital 



stems, 78. 



, some cherty beds of, con- 

 tain casts similar to the screwstones of Derby- 

 shire, 78. 



Fovant, Vale of Wardour, section at, 246. 



Franklin, Major, referred to, on points of geology 

 of India, 418, 420, 426, 428, 429, 431. 



Eraser, Mr. on the extent of trap in India, 429. 



Freshwater deposits in England, publications 

 upon, 324, note. 



, limestone, beds resembling, at the top 



of the Portland strata ; but including marine 

 shells, 333. 



shells, in oolite, at the bottom of the 



Purbeck series, in Oxfordshire, 275 — 276. 

 Fuller's- earth near Aylesbury, 287. 

 of Bedfordshire, described by Hol- 



loway, in 1723, 295. 



