NOTES ON THE LIAS IN THE NEIGHBOUHHOOD OF EADSTOCK. 187 



is quite abundant, and very good specimens may be obtained. 

 Eed (a) is easily found by its being mainly a mass of pbosphatic 

 concretions, dark grey in colour, imbedded in a pale marl, 

 and forming thus a well-marked dark line in tbe rock. 

 Where the rock is weathered the hard phosphatic concretions 

 stick out of what is seen to be a soft marly Limestone ; but where 

 freshly cut, the divisions between the beds are not well marked, and 

 the line of black included concretions is the chief feature that 

 divides the Middle from the Lower Lias. Immediately below this 

 level occurs A. planorlis, while above are M. Lias Ammonites 

 and Belemnites. We noticed one case of A. raricostatus here, 

 but as it was entirely phosphatical, it may probably be considered 

 a derived fossil. In a quarry not far off we found it in bed (e) 

 in a state which pointed perhaps to its being an inhabitant of the 

 bed itself. 



This section differs thus from preceding ones, in that the 

 Planorbis zone follows immediately below the M. Lias, — the 

 Bucklandi and Obtusus zones with the Spiriferina Walcottii-bed 

 being absent. 



The M. Lias is here altogether about 8 feet thick, and contains 

 an interesting assemblage of fossils. We have seen fragments of 

 a large Ammonite with a very square form of whorl, which 

 seems somewhat allied to A. quadrarmatus, Dum. The latter has 

 two rows of strong tubercles at the angles of the back, and is 

 therefore different from the Eadstock fragment, which has only 

 one row. We hope that an entire specimen may shortly be 

 obtained. We also have a broken specimen of A. Oppeli eleven 

 inches across. Brachiopoda are also fairly abundant. We may 

 cite Ter. Waterhousii and numismalis as characteristic of our 

 M. Lias ; also a form -yhich we take to be T. subovo'ides (Eoem.) 

 it is so constant in its form that it seems perhaps entitled to the 

 rank of a distinct species : it is more elongate than T. punctata^ 

 but I am by no means sure that it has not been included by Mr. 

 Davidson under that species. Spiriferina rostrata also occurs in 

 the M.^Lias here. Again Ehyn. tetraedra sparingly, also charac- 



