GEOLOGY. 5 



striatulum. (a) Unterregion : Thone mit Astarte Voltzii und Cerithium armatum 

 (' Oppel's Zone des Amm. torulosus ')." 



I have now given the opinions, as far as I have been able to ascertain them, 

 of a few of the authors who have made the Inferior Oolite their study, and 

 it certainly seems that the more usual custom is to divide the Lias from 

 the Oolite at the top of the Jurense-zone, of course commencing the Inferior 

 Oolite proper with the Opalinum-zone. I now propose to give some few sections 

 of the beds of the Inferior Oolite to try and clear up some of the differences which 

 exist as to their correlation, and I think I shall be able to clearly prove that the 

 Yeovil Sands and the Cotteswold Sands are identical, and that the Inferior Oolite 

 in the South of England, although not very thick, contains good representatives of 

 all the zones into which that formation has been divided in different countries. 



The following is a section of the Inferior Oolite showing its relation to the sands 

 below. This section is as it were made up of two portions ; the first, from Nos. 1 

 to 7 inclusive, is taken, with some slight alterations and additions, from my paper 

 read to the Geological Society on the Inferior Oolite Ammonites, 1881, and is the 

 result of my own observations. For the lower part of the section I am indebted 

 to my father's paper on the Cephalopoda bed. 1 This is a very carefully measured 

 section of the sands of Babylon Hill near Yeovil ; and, although it is situated about 

 a mile from the quarry which my section represents, yet there is on the top of the 

 hill a quarry (Anbury) which is, stone for stone, the exact counterpart of the 

 Bradford Abbas East Hill Quarry, indeed I do not know any species which the one 

 possesses foreign to the other, their Fauna and lithological characters being prac- 

 tically identical. For further evidence on this point see my father's paper just 

 quoted, page 3. 



Section of the Inferior Oolite and the Sands at Bradford Abhas, Dorset. 



Ft. In. 



{1 6 6 White Oolite, rather soft, almost unfossiliferous except in its lower part. 



2 3 Marl bed, contains Tereb. Morieri, Rhynch. parvula, Wald. carinata. 



3 6 Bluish stone, contains small Stephanoceras Humphriesianum, Tereb. spharoidalis. 



4 6 Irony stone, contains one or two species of Harpoceras. 



5 2 Yellowish stone, contains a quantity of Gasteropoda and Ammonites. 



6 10 Yellowish brown stone, comes out in large slabs. 



7 12 Very hard blue centred stone, contains many fragments of shells, also Harpoceras Moorei, Lye. 

 ' 8 ? A slight break of uncertain amount, but not more than 10 feet. 



9 5 Fine yellow sands. 



10 9 Sands with stone, or hardened sandy stone. 



11 16 Fine yellow sands. 



12 10 Sands with stone, or hardened sandy stone. 



13 10 Sands with irregular stone. 



14 2 6 Sands with stone, or hardened sandy stone. 



15 15 Sands with irregular stone. 



16 2 Stone. 



17 5 Fine yellow sands. 



18 2 9 Irregular masses of stone. 



19 4 Fine yellow sands. 



20 16 Two bands of stone. 



21 3 6 Fine yellow sands. 



22 2 Stone. 



\ 23 50 about. Sands with occasional layers of stone in the upper part. 



1 " The Cephalopoda Bed and Oolite Sands," bj Prof. Buckman, ' Proceedings Somersetshire 

 Archaeological Soc,' vol. xx, 1874. 



