22 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Apr. 6 



evidence being the few fossils enumerated below, which are widely 



scattered through the beds. 



Belemnites tripartitus, Schloth. Pholadomya, sp. 



Ammonites bifrons, Brug. Modiola, sp. 



communis, Sow. 



These are, as far as I know, all the species here found in the 

 Upper Lias below the sands. They are likewise much dwarfed. 



Lower Lias of Dundry. — Few districts exhibit a finer sequence of 

 the Lower Lias shales and limestones than the immediate neighbour- 

 hood of Bristol ; it is my intention, however, only to mention these 

 beds at Dundry Hill in their relation to those of the Inferior Oolite 

 which overlie or cap them. 



The lowest members of the Lias in the Dundry district are well 

 exhibited at Bedminster Down, Keynsham, Whitchurch, Queen 

 Charlton, Norton Malreward, "Winford, and Barrow ; and ascending 

 from all these points at the foot of the hill, to the summit, we pass 

 over the higher beds of the Lower Lias, which consist, as usual, of 

 alternating limestones and shales, under various conditions. The total 

 thickness of the Lias, constituting the main body of the hill, from its 

 junction with the Red Marl at Bedminster Down to its junction with 

 the overlying Inferior Oolite at the summit of the bill, is about 550 

 feet ; but in this fine developement there are no traces whatever of 

 the Middle Lias or Marlstone as exhibited in the Bath district and 

 in the Cotteswold Bange generally. We can only infer that some 

 portion of the true Upper Lias has been deposited here, — the only 

 evidence being the few characteristic fossils before mentioned. 



Upper Lias Sands of Dundry. — AH the evidence afforded of this 

 series is a bed, 2 or 3 feet in thickness, immediately below the true 

 Oolites. In these sands, at the western end of the hill, we find 

 dwarfed specimens of 



Modiola plicata, Sow. 

 Pholadomya fidicula, Sow. 

 arenacea, Lye. 



Lima bellula ?, Lye. Tar. 

 Belemnites irregularis, Schloth. 

 compressus, Volte. 



I am not aware that these sands are thicker in any other part 

 of the hill ; they pass downwards into the shales and clays of the 

 Lias beneath. 



Inferior Oolite of Dundry. — No. 1. Mollusca-bed, or Shelly bed. 

 Immediately upon the zone of the semi-indurated sands, with its 

 few fossils, rests the lowest member here of the Inferior Oolite 

 (marked No. 1 in the section fig. 4). This mollusca-bed, between 

 2 and 3 feet in thickness, is extremely rich in the type-forms of life 

 of the period, and is composed of coarse, brown, ferruginous or iron- 

 shot oolitic grains. This stratum passes insensibly (lithologically) 

 into a higher zone or bed (No. 2), which contains the well-known 

 Cephalopoda of Dundry Hill. These two beds are so intimately con- 

 nected, that it is difficult to draw any line of demarcation between 

 them, — the main feature observable being the large preponderance 

 of Gasteropoda and Oonchifera, which occupy the lower portion resting 

 upon the sands, whereas the upper or Cephalopod division (No. 2) 

 is entirely or mainly composed of Ammonites and Nautili. 



