Vol. 59.] TOARCIAN OF BREDON HILL. 447 



At Wotton the strata of the hemerse bifrontis-falciferi are called 

 Upper Lias (Gr 3), and the other Toarcian strata, Midford Sand 

 (G 4). At Bredon, strata of the hemerae Moorei to falciferi are all 

 termed Upper Lias (G 3). 



To take the evidence : — To indicate strata of the hemera Lilli, 

 there is a specimen of Hildoceras semipolitum, S. Buckm. 1 (B) ; for 

 hemera variabilis the specimen named Denckmannia bredonensis (B), 

 and a species of Brodiceras (B) ; for hemera Struchnanni, species 

 of Pseudograynmoceras (A & B) 2 ; for hemera dispansi, several spe- 

 cimens of Phlyseogrammoceras dispansum, Lycett (A & B) ; for 

 hemera Dumortierice a specimen of Catidloceras Dumortieri (Thioll.), 

 found by me some years ago in a gravel-pit at Beckford, near the 

 south flank of the hill 3 ; for hemera Moorei, two specimens of 

 ffliynchonella cynica, S. Buckm. (B), and specimens of a fine-ribbed 

 Dumortieria (A). 



The matrix in which these species are found is of somewhat 

 the same general facies — a greyish, or bluish-grey argillaceous 

 stone ; but there are certain characters which are easily recogniz- 

 able as distinctive of particular layers. So, although the thickness 

 of the deposits be not known, the following may be given as the 

 stratigraphical sequence : — 



Table II. — Toarcian of Bredon Hill. 



Hemerce. 



Character of Deposit. 



i 



Moorei 



Grey, somewhat sandy stone. 



Light yellow, argillaceous. 



G-reyish-yellow argillaceous stone, with many 

 comminuted shell-fragments. 



Grey argillaceous stone, with some shell-fragments 

 and many small shells. 



Greenish-grey stone, almost made up of commi- 

 nuted fragments which have a greenish tingo. 



Darkish-grey argillaceous stone. 



Dumorticrice 



Dispansi 



StrucJcmanni 



Variabilis 



L illi 





In breaking the stones of the gravel -pit, many specimens of Orbiculoidea 

 were found. There are apparently three or four species. From the lithic 

 characters of the matrices tabulated above they can be dated, with some 

 certainty, as follows : — 



Moorei (?). Small species (perhaps two ?). Numerous; a score of speci- 

 mens on a surface of 4 square inches. 



Dispansi. A small species, rather conical. 



Struckmanni. A flattish species, much larger, about 10 mm. in length. 



Lilli. A small species. 



These species are new to this country. There is only one species of 

 Orbiculoidea (olim Biscina), recorded by Davidson 4 from a similar horizon : 

 that is certainly distinct. 



1 See ' Emendations of Ammonite-Nomenclature ' p. 4, Cheltenham, 1902. 



2 (A) indicates the stones on the gateway ; (B) those from the gravel-pit at 

 Overbury. 



3 The gravel in this case is stream -transported, and is in the vale, about a 

 mile from the hill. 



4 ' Monogr. Brit, Foss. Brack.' vol. iv, pt. ii (1878) Suppl. p. 233. (Pal. Soc. 

 vol. sxxii.) 



2k2 



