302 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [A\m\ 9, 



M. Richard * thus describes the locaHty and bed of his Rhyncho- 

 nella cynocephala : — " Un calcaire marno-ferrugineux, place au-des- 

 sus des marnes superieures du Lias, et au-dessous d'un calcaire ap- 

 partenant a T oolite inferieure, qui lui-meme est recouvert non loin 

 de la (Bourmont, Haute-Marne) par le calcaire a entroques. Les 

 couches qui la contiennent doivent sans doute etre rapportees a 1' oo- 

 lite ferrugineuse inferieure, car on a tente a plusieurs reprises d'en 

 extraire du mineral de fer pour le haut-fourneau de Vrecourt ; mais 

 ce minerai ne s'est point trouve assez riche, ni peut-etre assez abon- 

 dant." 



Mr. Davidson, after having examined a series of Terebratula sub- 

 punctata, David., from the Cephalopoda-bed at Beacon Hill and 

 Frocester Hill, informs me that it is " a well-known form and occurs 

 abundantly in the Liassic beds, and in the beds just above the 

 Upper Lias (the equivalent of the Cephalopoda-bed) in France," 

 where he collected it with Rhynchonella cynocephala ; and that it may 

 probably be a variety of Terebratula punctata. Sow., which is a well- 

 marked species belonging to the Marlstone ; many shells from the 

 Marlstone near Ilminster closely resembling those from the Frocester 

 Cephalopoda-bed. 



At the Horspools near Painswick the Cephalopoda-bed and Brown 

 Sands are finely exposed in a lane near the hotel, where their rela- 

 tion to the other Lias beds may be satisfactorily made out ; I col- 

 lected here Ammonites variabilis, d'Orb., fragments of Ammonites 

 opalinus. Rein., Rhynchonella cynocephala, Rich., Terebratula sub- 

 punctata, Da^ddson, and many other Lias shells in a fragmentary 

 state. 



Section IV. — At Frocester Hill, near Stonehouse, Gloucester- 

 shire. Fig. 2. 



This fine section and the one near Wotton-under-Edge are the most 

 typical of the beds now under consideration. The palaeontological 

 and stratigraphical relations of " the Cephalopoda-bed," in particular, 

 to the Oolitic limestones above, and to the Upper Liassic sands 

 below, are admirably shown in both. I had lately the pleasure of 

 making an excursion to Frocester Hill with my friends Professor 

 Ramsay, Local Director of the Geological Survey, and Mr. Edward 

 Hull, F.G.S., who has surveyed a considerable part of the oolitic 

 district of Gloucestershire. At my request Mr. Hull has prepared 

 the accompanying diagram from a sketch made on that occasion, 

 which exhibits very clearly and faithfully the relation of the beds so 

 well exposed in this locality. The thickness of the strata indicated 

 in the section is only approximatively true, as it would be a tedious 

 process to level them all accurately. 



* Bulletin Soc. Geol. de France, vol. xi. p. 263, 1840. 



