6 J. BUCKMAN ON THE (JEPHALOrODA-UKDS OF 



sands with shelly oolite interpolated in slabs at Bradford Abbas T 

 Babylon Hill, and the adjacent district. 



The following list of fossils from the freestone at Ham Hill and 

 the shelly oolites of Dorset can nearly all be matched in the lower 

 beds of the Inferior Oolite of Gloucestershire, 



Belemnites compressus, Blame. 



tricanaliculatus, Ziet. 



subtenuis, Simps. 



abbreviates, Mill. 



Nautilus latidorsatus, D'Orb. 



iaornatus, D'Orb. 



Ammonites jurensis, Ziet. 



Moorei, Lycett. 



opalinus, Rein. 



Edouardianus, B' Orb± 



Murchisona?, Sow. 



, other species. 



Ostrea bullata,. ? 



Buckmanni, L.yc. (?) (Gryph-asa). 



subloba, Desk. 



Marsbii, Sow,, = flabelloides, 



Lam. 

 Lima densipunctata, Horn. 1. 14. f. 3. 



— grandis, Rom. i. 13. f. 10. 



rigida, Sow. 



Pecten lens, Sow. 



annulatus, Sow. 



disci tes, Goldf. 



, other species. 



Gervillia Hartmanni, Goldf, 

 Pinna Hartmanni, Ziet. 

 Avicula complicata, Buckm, 

 Astarte elegans, Sow. 

 -^-- — pullus, Mow,. 



obliqua, Bssh. 



, other species. 



Trigonia, costated speciesk 



, clavellated species. 



JLuciaa bellona, B Orb. 



Ceromya (Isocardia) concentrica, Sou/. 



Tancredia donacii'ormis, Lye. 



Spines of Cidarides, 



Ossicula of Apiocrinus. 



Serpuhe, &?. &c. 



JsTow this list of fossils is sufficient to mark the oolitic nature of 

 these thick beds below the Cephalopoda-bed of Dorset ; and if this- 

 new reading of the matter be correct, our sands are not the equiva- 

 lents of the Gloucester sands, or rather the Cotteswold sands, but 

 the representatives of the lower beds of the Inferior Oolite, which 

 at Ham Hill is a good freestone, from containing so much lime, 

 while at Bradford it is hard, in bands consisting of a shelly oolite, 

 with thick beds of sand between, not sufficiently indurated to be 

 used as stone. 



If this be so, then it is clear that the name of " Upper Lias 

 Sands" cannot be retained for these sand-beds. 



The most recently published notion upon the sands is from the 

 pen of Professor Phillips, in which he proposes to name them the 

 " Midford Sands"*, as they were studied by Smith at the village of 

 Midford, and decided by him to be " sands of the Inferior Oolite." 

 If, however, the sands of the west be really of Inferior-Oolite date, 

 they ought not to be correlated with the sands of the Cotteswolds, as 

 these are in a considerably lower position. 



Leaving then this question for further consideration presently, 

 we will now more particularly describe the Cephalopoda-bed of 

 Dorset ; and in doing this, it will perhaps be well to first give a sec- 

 tion of the oolitic rocks in the middle station at Bradford Abbas, 

 premising that the Ammonite-bed is the most constant in the 

 district. 



' Geology of Oxford,' p. 109, 



