80 ME. S. S. BUCKMAN ON [vol. lxxvi, 



horizon from Weston Subedge and Bayliss Hill. The same 

 explanation has more reason on its side to account for the absence 

 of the Echiocerate and ' guibalianum ' \_Qleviceras~\ faunas from 

 the cutting immediately south of Bayliss Hill ; for this lacuna 

 is to a certain extent > -shaped, and stratal failure requires 

 lenticular lacunae : the southern part, on this theory, is unexposed. 

 The absence from these cuttings of the hiferum fauna supports 

 my separation of its horizon from that of oxynotum. I surmised 

 it as belonging to a level immediately below oxynotum, and it 

 might be argued that none of the cuttings reached the level 

 required to find the hiferum fauna. Yet this fauna is found 

 at Aston Cross, near Tewkesbuiy, as I recorded in my former 

 paper — a locality about 3 miles to the north-west of the nearest 

 part of the line under review, and at a very considerably lower 

 level of ground : presumably the result of folding and faulting. 

 And this fauna is widespread — extending to Wiirtemberg. Against 

 the argument that the cuttings did not go low enough, and in 

 favour of an argument of local stratal failure or non-sequence, is 

 the occurrence of the Rhone-Basin species Oxynoticeras chinia- 

 censis. 1 Assuming this to be even approximately determined, 

 I judge it to have the character of a species belonging to the 

 G-agaticeras horizon (Deiran 1), while the so-called Oxynoticeras 

 ferrugineum may possibly indicate the simpsoni horizon. 



(e) The Gloucester Fauna, especially Schlotheimia. 



Very curious evidence in connexion with stratal and other 

 failures comes from Mr. Richardson's second paper, giving a list of 

 the fauna found on a spoil-heap resulting from excavations at the 

 Gloucester Gas-Works. Mr. Richardson says that 



' the fatinal contents of the beds are similar to those of the equivalent deposits 

 seen in certain of the railway- cuttings ' (p. 154) ; 



and, in a way, that is correct. But there is one great feature of 

 difference in the ammonites, namely, eight species ~ of Schlot- 

 lieimia^ — small forms, more or less allied to Sclil. lacunata (J. 

 Buckman), and there is one more which he has missed : not one 

 of these is recorded from the railway-cuttings ; and this faunal 

 dissimilarity is a very special feature which requires explanation. 



The position of these small Sclilotheimice I judged to be about 

 Mercian 7 (ienotatus), on these grounds : — the original of 

 Ammonites fowleri J. Buckman 1844, 3 identical with or very close 

 to A. denotatus Simpson 1855, 4 is attached to a Lias nodule from 

 Lansdown, Cheltenham, in which are many specimens of small 

 Schlotlieimice. A similar nodule said to have been found at the 

 foot of Dowdeswell Hill, east of Cheltenham, 5 which geologically 



1 VI, 1, pi. xxv, figs. 8 & 9. 



2 These have been described and figured in II, 2, No. 78, and II, 3. Several 

 of the types are from this Gloucester excavation. 



3 I, p. 104, pi. xii, fig. 7 ; II, 2, No. 37, 1904. 



4 II, 4, No. 67. 5 I, p. 105. 



