BRITISH OOLITIC AND LIASIC BRACHIOPODA. 



Upper Calcareous Grit, 



Coral Rag, 

 Lower Calcareous Grit 



Oxford Clay, 



Kelloway Rock . . . 



Combrasb 



Forest Marble 



Bradford Clay 



Great Oolite 



r Coarse shelly limestones, more or less thick- 

 bedded ; coarse oolitic limestones abounding ^ 

 in corals, calcareo-siliceous grit. 



'Dark blue clay, with Septaria ; sometimes slaty-i 



and bituminous, with a subordinate band of I 



- ferruginous sandy limestone (Kel. rock). J 



Coarse rubbly limestone, thinly laminated with"] 

 layers of clay. 



Thinly-laminated shelly limestone, sand, and 

 gritstone, with layers of clay. 



Headington, Oxon ; West- 

 brook, Calne, and Steeple 

 Ashton, Wilts; Malton and 

 Scarboro', Yorkshire. 



Chippenham and Wooton 

 Basset, Wilts ; Oxford ; 

 Yorkshire, &c. 



Stanton, Malmsbury, Ash- 

 ford, Wilts. 



Corsham, Box, &c, Wilts ; 

 Sapperton, Bradford, Ci- 

 rencester. 



r 1 



] of limestone. 



I Oolitic shelly limestone, : 



Fullers-earth Clay . . / 



Inferior Oolite 



Lias 



Layers of clay ; sometimes alternating with bands 1 Bradford, Burfield, Pickwick, 



j Tetbury. 



-\ Bath, Bradford, Minchin- 

 i more or less compact and , 



t. ".,,,, , > hampton Common (very 



sandy, sometimes thick bedded. . .... . 



J fossiliferous). 



(a) Cayton and Gristhorpe 

 Bays ; (b) Cloughton and 

 White Nab ; (c) between 

 Cloughton Wyke and Blue 

 Wick. 



"1 Stonesfield, Oxon ; Seven- 



hampton Common, &c. 

 t Bath,' Box, near Stroud, and 

 J Hampton Common. 



JDundry, Painswick, Brins- 

 combe, The Cotteswolds, 

 Blue Wick, Yorkshire. 



1 Whitby, Redcar, Yorkshire ; 

 > Gloucestershire ; Somerset- 

 J shire j Lyme Regis, &c. 



On the Yorkshire Coast, the Great or Bath Oolite (6), (a hard, blue lime- 

 stone ; fine-grained Oolite ; hard blueish clay,) is contained between two 

 thick beds (a, c) of gritty laminated sandstones and shales, containing an 

 abundance of terrestrial plants. 



Stonesfield Slate . . . I Oolite, shelly, and gritty limestone ; slaty. 



"Two layers of coarse shelly ragstone, with inter- 

 vening bands of marl and soft freestone. Fine- 

 - grained sandstone and ironstone. 



Alum shale ; rubbly and sandy shales, &c. 

 Lias limestone and shales. 



Lower 



These names and divisions are in general use, though each continental country has, in 

 some cases, adopted synonymous denominations, which they always endeavour to attach to 

 the British original type. 1 



The latest innovation is published by M. D'Orbigny, in a small elementary work, 

 where he proposes the following classification : 2 



1 For ample information, consult the works of W. Smith, Conybeare and Phillips, Sir C. Lyell, Sir 

 H. De la Beche, Sir R. 1. Murchison, Professor Phillips, Morris, Webster, Buckland, Lonsdale, Buckman, 

 Young, and Bird, &c. ; and the works of Elie de Beaumont, Dufresnoy, Baron Von Buch, Alcide D'Orbigny, 

 Bronn, Pusch, Roemer, D'Archiac, &c. 



2 'Cours elementaire de Paleontologie et de Geologie Stratigraphique,' par M. D'Orbigny. 1850. 



