208 



PROCEEDINGS COTTESWOLD CLUB 



1911 



IS- 



IS- 



16. 



{17 



18. 



Thickness in ft. ins. 

 Cyathopora-bonrgeti'Bed. Marl of a green- 

 ish-grey colour with numerous peculiar 

 white concretions (and irregular limestone- 

 layers) and therefore an easily-found bed ; 

 NerincBa voltzi, Gervillia waltoni, Perna my- 

 tiloides Lamarck, Placunopsis socialis M. 

 and L. Nucula menkei (Roemer), Ostrea, 

 Volsella imbricata (Sow.), etc : Cyatho- 

 pora bourgeti occurs principally at the base: 

 o ins. to . . . • • - • - • - 21 



Lower ATerjH^a-Bed. 1 Limestone , pale-green 

 when freshly-fractured and readily-recog- 

 nised by innumerable specimens of Neri- 

 n<Bce. At the western end represented 

 only by an occasional nodule ; Cyatho- 

 pora bourgeti (Defr.) near the top, Arctica 

 loweana (dwarfed form), Rhynchonella con- 

 cinna, auctt., Astarte, Nerinwa, etc. : o ins. 



to I ft 08 



Irregular parting of clayey marl : o to . . o 2 

 Astarte-oxoniensis-'Lim.esi.one:.'- Limestone, 

 very variable in thickness and mixed with 

 marl. When freshly fractured is pale- 

 green, with a tendency to become "rotten," 

 while the harder portions are blue and 

 shelly; Perna cf. mytiloides, Nucula menkei 

 auctt., Volsella imbricata, Exelissa spp., 

 etc. : o to 8 ins. . . . . • . • • 05 



Fairly persistent parting of greenish clayey 



marl : 1 to 3 ins. . . . . . . . . 03 



Exelissa-lAmsstone. Limestone with pale- 

 yellow or whitish exterior, blue-hearted. 

 The weathered surfaces show innumerable 

 specimens of Exelissa. The nether surface 

 is very irregular ; A mberleya aff . nodosa 

 M. & L., " Phasianella" pontonis Lye, Pro- 

 tocardia buckmani (M. & L.), Nucula men- 

 kei, etc. : o to 10 ins. . . . . . . 06 



Limestone, according to Walford, 5 inches thick). 

 Perna-Bed. Pale-yellow and greenish and 

 bluish marl and stone. Perna oxoniensis 

 Paris, P. mytiloides, Gervillia waltoni, [G. 

 richardsoni Paris''] Protocardia lingulata 

 (Lye), Pleuromya cf. unioniformis (M. and 

 L.), Vol. imbricata, Ataphrus labadyei : [A. 

 discoideus M.& L., Delphinula benoisti Cos- 

 mann^], Exelissa spp., etc. : i ft. to . . it 

 Reddish-brown sandy layer with nodules 

 and masses of a blue shelly limestone on its 

 horizon ; Perna, Placunopsis socialis, Ger- 

 villia, Volsella, Exelissa, numerous ostra- 

 cods (in the limestone-band) : o to . . o i 



Clay, black with a reddish-brown seam {20a) 

 at the base . . . . . . ■ - • • 11 



1 This bed might be called the Lower Nerinaa- and V olsdla-'QeA in this area ; and 



2 This bed the A .-oxoniensis- and N. me»ftct-Bed. 



S Not found i» si(«. See page 234, and PI. xxvii., figs.. 3(1 and 6. 



4 Not found in situ. D. benoisti is figured in the BuU.Soc. Geol. France, vol. xxvu., 3ieme 

 sferie, 1899, pi. XV., figs. 12-14. 



I 



