Vol. 59.] TOARCIAN OP BREDON HILL. 457 



it is desirable to note a local sandy development of Upper Lias, 

 as in the case of the Cotteswold Sands, which are of earlier date 

 than the Upper Lias (G 3) of the Dorset coast, but are now called 

 Midford Sands (G 4) — then they might be distinguished as G 3 

 with certain marks to denote the lithic change. 



The following emendations in Prof. Renevier's ' Chronographe 

 Geologique/ C.R. Congres Geol. Int. (6 mc Session, Lausanne, 1894) 

 1897, p. 647, may be made "with regard to these entries : — 



' Micaceous Sands = Gres jaune des Cotteswold-Hills (Angleterre). Bajocien 

 inferieur.' 

 For this read : — 



'Micaceous Sands = Gres jaune du cote oriental des Cotteswold Hills, 

 Angleterre (Harford Sands). Aalenien superieur. 



'Micaceous Sands = Grres jaune du cote occidental des Cotteswold Hills 

 (Cotteswold Sands). Toarcien, -pre-striattdi.' 



' Midford Sands =Gres ferrugineux a Bhynchonella cynocephala l de N. An- 

 gleterre. Aalenien inferieur.' 

 Eor this read : — 



'Midford Sands=Gres jaune des environs de Midford (Bath) Somerset, 

 S.O Angleterre. Toarcien, p o s t-striatuli. 



' Midford Sands, sensu lato = Gres jaune de S.O. Angleterre (Gr 4). Aalenien 

 et/ou Toarcien.' 



VII. Comparison of Teems. 



The following Table shows the correspondence between the terms 

 used in a communication on the Cotteswold, etc. Sands published 

 in vol. xlv of this Journal (1889) and those employed in the present 

 paper. It will enable the remarks made in the present communi- 

 cation to be understood, with reference to the various sections there 

 given. It will also be useful as showing the present interpretation 

 of the stratigraphical names used in regard to sections in the early 

 parts of my Monograph on the Inferior-Oolite Ammonites (Pal. Soc). 



Table VII. — Comparison op Terms. 



' Cotteswold, &c. Sands.' Quart. Journ. Present paper. 



Geol. Soc. vol. xlv (1889) pp. 440-74. f . , . a , 



( ( f rScim i Aalenmn Stage 



. | Opalinum- ( Opalinum-heds = ^ ^ I 0paM/rdform ^ > (Ludwigian 



Z I zone. ] M • i ! f 1 Aalensis. J 



| ] '^om-beds = | [ MooreL ^ 



( Dumortieria-be&s. \ Dicmortierice. 



S J I 1 Dismnsum-beds = I ' Dispansi. 



cH j Jurense- \ • I I StrucJcmanni. 



7.r»nf> ! 



Toarcian Stage 



! Striatulum-beds. = i Striatuli. > (Harpoceratan 



I 



( Variabilis-beda. { Variabilis. 



Commune- 1 _ J Lilli. 



\ zone. J ~ \ Bifrontis. 



Age). 



1 Bhynchonella cynocephala, in a strict sense, is a species of the Aalenian. 

 For dates of Bhynchonellce of the cynocephala-group, and their specific 

 distinctions, see my paper on the ' Mid-Cotteswolds ' Quart. Journ Geol Soc 

 vol. li (1895) p. 448. 



2 Bead for =, ' equal to strata deposited during hemera.' The henieral 

 names used for stratigraphical purposes would designate the respective fauni- 

 zones. 



