1867.] TATE AMMONITES-ANGULATUS ZONE, 307 



cutting of the Great Western Uailway, near Warwick, although very 

 few MoUusca besides Ammonites angulatus were obtained therefrom" 

 (Wright^). One of the commonest species is Lima succincta, Schloth., 

 a very characteristic fossil of the zone. 



4. Worth Gloucestershire. — Blocks of shaly limestones from Down 

 Hatherly, Gloucester, forwarded to me by the Rev. P. B. Brodie, 

 P.G.S., for examination of the Gasteropods exposed on their wea- 

 thered surfaces, are referable from their fossil contents to the zone of 

 Ammonites angulatus. These limestone blocks were obtained in 

 drain- cuttings and the like, for no open section of the beds is to be 

 met with ; and they would appear to occupy a position beneath the 

 " Bucklandi-beds " (which near Churchdown are seen dipping to the 

 south-east), and aJooYe the Avicula-contorta, series of Wainlode (which 

 is in the line of dip, and to the north-west of Down Hatherly). 

 Therefore, if the Avicula-contorta beds of "Wainlode and the Lias 

 resting on them dip uniformly to the south-east (there is no evidence 

 of a transverse fault), the beds intermediate between them and the 

 Bucklandi-limestones must occur between the outcrops of these two 

 series. The position of Down Hatherly in relation to Churchdown 

 and Wainlode favours the assumption that the blocks of limestone, 

 incomparable with any known limestone of or above the '' Bucldandi- 

 beds," are derived from strata in place, having such an intermediate 

 position — that is, of the horizon of Ammonites angulatus. 



5. Glamorganshire. JBrocastle, Sfc, near Bridgend. — ISTot wishing 

 to encroach on the legitimate domain of Mr. Charles Moore, I re- 

 frain from entering into details regarding my views, which are the 

 result of actual survey, of the relations between the remarkable de- 

 posits of Brocastle, the " Bucklandi-beds " at Bridgend, and the 

 Sutton Stone. Dr. Duncan f has already shown that the Madre- 

 porarian fauna of these deposits is that which characterizes the zone 

 of Ammonites angulatus in many parts of the Continent. My inde- 

 pendent examination of the Mollusca, especially of the Gasteropods, 

 which are numerous in species, has led me to a like conclusion. 



III. The Stjtton Stone. 



Through the liberality of Dr. Milligan, my attention had been 

 engaged with the organic contents of the Sutton Stone some 

 time previously to the reading of Mr. Tawney's paper on the Rheetic 

 beds of South Wales J; and subsequently I have visited Sutton 

 with the special view of seeking further palseontological evi- 

 dence of the age of that limestone, which I had regarded from 

 its fossil contents and mineralogical characters as the direct equi- 

 valent of, i. e. deposited at the same time and under similar conditions 

 as, the " Calcaire de Yalogne," which approximates to the zone of 

 Ammonites angulatus. 



I am induced record to my observations on the fossils of the 

 Sutton Stone in consequence of what I consider the erroneous deter- 

 minations of Mr. Tawney ; and it was simply with this view that I 



* Loc. cit. p. 64. 



t Quart. Journ. Geol. Soc. vol. xxiii. p. 23. \ lb. vol. xsii. p. 69. 



