252 



Mr. Lonsdale on the Oolitic District of Bath. 



upon the fuller's earth, is a fine-grained stone, scarcely oolitic, and crystalline 

 in its structure. On the ridge to the north of Wellovv is a peculiar stratum 

 belonging to this division of the great oolite. It is composed of a tough, 

 rubbly rock, containing much argillaceous matter, and in some parts nume- 

 rous, small, globular grains of oxide of iron. It abounds with Terebratulae 

 and Ostrea acmninata. 



For the sake of illustrating the arrangement of the beds of the great oolite 

 and the local variations, a series of sectional lists is subjoined. The first is 

 from Farley Down near Bathford. The upper rags (I.) are partly concealed 

 by vegetation. 



Ft. In, 

 f Rubble 8 



!•<! 



Hard rag 2 



Pale blue, stiff clay ... 1 



Rubbly stone 3 



Soft rag 11 



Coarse, shelly oolite. 



r Yellowish, argillaceous limestone, containing many fragments 



\ of organic bodies. 

 

 „ f Principally composed of fossils united by indurated marl, but 



\ in some parts oolitic. 

 Perishable freestone. 



["This stratum varies greatly ; in some parts it is a coarse 

 „ , /I nJ oolite ; in others a brown or yellowish, argillaceous lime- 



° J stone, enveloping large masses of Polyparia, and casts of 



L shells filled with calcareous spar. 



"Capping 1 6 



Grey bed 1 8 



White bed 10 



Hard bed 2 6 



LRedbed 9 



3. Lower rags. 



1 



Ancliff near Bradford. 



pRubhle 5 Abounding with Polyparia. 



I Soft oolite 15 This is the bed celebrated for the Ancliff fossils. 



l.< Clay 1 Containing small sponges and many fragments of shells. 



I Rag 6 6 Very coarsely oolitic. 



LSoft oolite 5 



Comb Down. 



Ridding 9 



1-S 



Crane bed 1 



Clay 3 to 12 inches . . 



Rag beds 7 



Picking beds 4 



Cockle bed (in some"! 



{Many beds of stone differing in characters : some of them are 

 rubbly, and resemble the "crane bed ;" others consist of 

 an earthy, brown limestone. 

 ^ f Lightly coloured, earthy limestone, with imperfectly formed 



\ oolitic particles. 

 7 



An indistinct oolite, with a few fragments of shells. 



Soft freestone. 



. quarries wanting)./ ^ ^ Earthy, hard limestone, with casts of Polyparia. 



