1867.] TATE AM]U:OIs^TES-ANGTJLA.TUS ZOKE. 309 



follo'v\dng amended list of species, upon which I base my conclu- 

 sions : — 



List of Fossils of the Sutton Stone. 



Species of Mr. Tawney's List. Species adopted. 



Ammonites Dimrayenensis, Taw. A. sp. indet. 



,, Siittonensis, Taw. A. Johnstoni, Sow? 



Pecten Etheridgei, Taw. P. texuratus, Miinst. (juv.). 



Siittonensis, Taw. ' P. Yaloniensis, Defr. 



Lima tuberculata, Tqm. L. Terquemi, Tate. 



subduplicata, Taw. L. Hettangiensis, Tqm. ? (juv.). 



Dmirayenensis, Taw. L. Yaloniensis, Defr. 



(? L. exaltata, Tqm.) 



angnsta, Taw. L. angusta, Taw. 



planicostata, Taw. L. planicostata, Taw. 



Ostrea leevis, Taw. ^ r\ ■ i • o z,7 v^z, 



Anomia socialis, Taw. \ ^- ^^^^g^^ris, Schloth. 



Ostrea multicostata {Miinst.), Taw. Terquemia arcitis, Quenst., sp. 



Pinna insignis, Taw. P. semistriata, Tqm. 



Pinna? Eamsayi, Taw. P. infraliasina, Quenst. 



Cardinia Snttonensis, Taw. C. regularis, Tqm. 



ingens. Taw. C crassiuscula, Sow. 



Mytilus imbricatoradiatus, Taw. Mytilus imbricato-radiatus, Taw. 



Cardita ? rhomboidalis, Tavj. Astarte ? sp. 



Astarte Duncani, Tazv. Cardita, sp. 



Cyprina normalis, Taw. Lucina, sp. 



Plicatula intusstriata, E7n. Plicatula intusstriata, Em. 



Patella Siittonensis, Taw. Patella Hettangiensis, Tqm. 



To the above I have added : — 



Patella Milligani, Tate. Pleurotomaria nucleus, Tqm. 



Neritopsis exigiia, Tqm. Trochus Andersoni, Tate. 



Dental ium tenue ? Port lock. 



The majority of the species of the above list occur in other parts 

 of Great Britain, and are well-known fossils of the Continent ; they 

 incompletely represent the fauna of the beds beneath the zone of 

 Ammonites Buchlandi. 



Lithologically the Sutton-stone beds are somewhat exceptional as 

 regards this country ; but the development of dolomitic limestones 

 at the base of the Lower Lias is by no means an unusual occur- 

 rence in many parts of Prance &c. As a general rule, this litho- 

 logical feature is presented by the base of the Lias when it rests on, 

 or is in close proximity to, reefs of pre-Secondary age — as, for ex- 

 ample, the " Calcaire de Yalogne," the characteristic fossils of which 

 are among the commonly occurring species in the Sutton Stone. The 

 physical conditions under which these limestone beds were deposited 

 were identical. The Calcaire de Yalogne, however, overlies beds of 

 the age of the zone of Avicida contorta, whilst the Sutton Stone rests 

 directly on the Carboniferous Limestone. 



If the Calcaire de Yalogne be identical with the Sutton Stone, the 

 intermediate position of the latter between the Avicula-contorta 

 series, and the zone of Am. BucMandi is established, were any such 

 proof required. 



My conclusions are : — 



(1.) That the Sutton Stone is not Rhsetic, nor of pre-Ehaetian age, 

 is not only proved by its fossil contents, but also by the absence of 



