

71 



Ostrea subloba, Desk. Ceromya (Isocardia) concentrica, 

 Marshii, Sow., = flabelloides, Sow. 



Lam. Tancredia donaciformis, Lye. 



Lima densipunctata, Rom. t. 14 f. 3. Spines of Cidarides. 



grandis, Rom. t. 13 f. 10. Ossicula of Apiocrinus. 



rigida. Sow. Serpulae, &c., &c. 



Now 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. 



Professor Phillips has lately proposed to call the sands, as they 

 occur in the neighbourhood of Bath, "Midford Sands," from the 

 village of that name ; but, if they be really the equivalent of the 

 oolite series, this term can only apply to the lower part of the 

 series. 



Our Bradford Abbas Cephalopoda-bed occupies the top, and not 

 the bottom, of the Inferior Oolite series, as will be seen from the 

 following : 



Section of Bradford Abbas (East Hill) Quarry. 



ft. in. \ Trigonia Grit of 



* Soil ( *> Buckman, Geol. 



2 White oolite with irregular cleavage 6 Oj of Cheltenh 



3. Band of marl, with Astarte and Lima, elem- 



nites, &c 3 



4. Hard ironshot rock, with Ammonites, Belem- 



nites, &c 10 



K-DJCI i_ i rnr Cephalopoda - bed 



5. >and or brownish stone, marly at top, lull or 



1- =GryphiteGrit 



Univalves and Ammonites (Jo 



* T i x. i-i r /-( 1. i j of Buckman. 



6. Ironsnot oolite, a mass 01 Cephalopoda 1 



7. Marl with Astarte trigonalis 3 



8. Bed with Ammonites aalensis and Univalves 9 



9. Blue-centred oolite, with Isocardia concentrica... 1 2 



10. Eeddish sands, commencing the lower freestone system of the Cotteswolds. 

 (These latter are from 100 to 150 feet in thickness, occasionally interpolated 

 with bands of oolitic stones, with numerous fossils of that rock.) 



