310 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 9, 



Ft. in. 



E. A hard, greyish, crystalline limestone, raised and broken 



up for road-mending ; it resembles carboniferous lime- 

 stone, and contains shells in a fragmentary state : it is 

 about 9 



F. Fine brown and yellowish sands, very micaceous in parts, 



and containing hard, sandy, lenticular concretions : 

 thickness considerable. 



Fossils of the Inferior Oolite — a. 



A. Contsms Pholadomy a Jidicula, Modiola plicata, and other 

 Inferior Oolite shells (undetermined) ; the same bed near 

 the Half-way House is overlaid by ragstones containing 

 Ammonites Parkinsoni, Sow.; so that the upper and 

 lower ragstones are here in conjunction, the intermediate 

 freestone being exceedingly thin, or perhaps wanting. 

 Fine large specimens of Ammonites Truelli, d'Orbigny, 

 were hkewise collected here. 



Fossils of the Cephalopoda-bed — d, e, f. 

 Cephalopoda. 



Ammonites Jurensis, Zieten. Ammonites striatulus. Sow. 



concavus. Sow. — - insignis, Schubl. 



Dorsetensis, Wright, n. sp. Nautilus inornatus, d'Orb. 



variabilis, d'Orb. Belemnites compressus, Voltz. 



Gasteropoda. 

 Turbo capitaneus, Munst. Turbo spinulosus, Munst. 



Sections in Dorsetshire. — The Cephalopoda-bed, vrith its under- 

 lying sands, is admirably developed in Dorsetshire. In several 

 places near Bridport these beds are well exposed. Watton Hill, on 

 the west side of Bridport Harbour, is capped with fossiliferous beds 

 of Forest Marble, which form the extreme south-western extension 

 of this formation on the English Coast. This rock consists here and 

 at Bothenhampton of thick limestone-beds, composed of shelly frag- 

 ments and interstratified with layers of a coarse oolitic sandy slate. 

 It contains 



Lima cardiiformis. Sow. Apiocrinus rotundus. Miller. 



Pecten lens, Sow. Echinobrissus clunicularis, Lhwydd. 



Avicula echinata. Sow. Holectypus depressus, Leske. 



Ostrsea. Acrosalenia hemicidaroides, Wright. 



Terebratula obovata. Sow. spinosa, Agass. 



intermedia. Sow. 



Economically it is used as a building-stone and is burnt for lime. 

 The Forest Marble is underlaid by a thick bed of grey marl, the 

 Fuller's Earth, which attains a thickness here of about 150 feet, and 

 contains 



Pholadomya carinata, Munst. Ceromya concentrica, Sow. 



Terebratula ornithocephala. Sow. Ostrea acuminata, Sow. 

 Myacites. 



