258 S. S. Buchnan — On Ammonites Jurensis. 



In regard to the marine gravels in which Professor Prestwich found 

 the Cyrena flnminaJis, and which have yielded many Mammalian 

 remains, Mi-, Reid admits that at one spot, at Kelsey Hill, a face of 

 about 12 feet of weathered Boulder-clay, with small stones, can be 

 seen overlying the gravel {id. p. 54). 



Mr. Gr. W. Lamplngh, in his paper on the Drifts of Flamborough 

 Head recently published, is most clear on the subject. He describes 

 the buried cliff at Sewerby as having been formed by marine action 

 prior to the deposition of any of the Glacial beds, and as having 

 afterwards been buried and obliterated by the accumulation of 

 materials banked against it (Q.J.G.S. vol. xlvii. p. 394). In a later 

 paper, where he enters into greater detail, he puts the Sewerby 

 gravels, which have yielded so many Pleistocene Mamma,lian remains, 

 distinctly under the whole Glacial series, and notably under the 

 so-called basement bed. He comes to precisely the same conclusion 

 in regard to the marine shell bed at Speeton {op. cit. pp. 410-4:12). 

 In the discussion on this paper Mr. E. T. Newton describes the 

 remains of mammals from Sewerby as just such an assemblage as 

 might be expected in an undoubted Pleistocene deposit. 



It seems to me, therefore, that the Yorkshire evidence, wherever 

 we can test it, agrees with that of Scotland and of Cheshire in 

 compelling the conclusion that the horizon containing remains of the 

 Mammoth and its companions is distinctly below the Drift beds. 



{To be continued.) 



IV. —The Eeported Oocurrknce of A.\tmo.\it£S jureksis in the 

 Northampton Sands. 



By S. S. BucKMAN, F.G.S. 



IN the Geological Magazine (Dec. III. Vol. VIIT. No. 329, 

 p. 493, Nov. 1891), Mr. E. T. Newton has a "Note on the 

 Occurrence of Am. jurensis in the Ironstone of the Northampton 

 Sands in the Neighbourhood of Northampton." This note had 

 especial interest for me, from my having contested Mr. Beeby 

 Thompson's view of the Jiirensis-zone being represented by the 

 clayey beds beneath the Sands ; and, in fact, it seemed to support 

 my argument. Further reading, however, obliged me to confess 

 that I could not claim this support; for Mr. Newton says (p. 494), 

 " that the specimens of Am. jurensis agree exactly with Dr. Wright's 

 plate 79 (Lias Ammonites)." 



Now, in 1887, I pointed out that this form of Wright's was very 

 different to Zieten's jurensis, and that it occurred in the Opalinum- 

 ' zone ; ' and, in 1888, having occasion to refer to it in some sections, 

 I named the form afresh Lytoceras Wrighti.^ Further, the same 

 form is figured by Branco, under the name Lytoceras diliicidum 

 on the authority " Dumortier (non Oppel)." ^ 



The form called Lytoceras Wrighti differs materially from Zieten's 



^ Inferior Oolite, etc., Proc. Cotteswokl Club, vol. ix pt. ii. p. 134, footnote, 1887. 



- Monogr. Lias Amm. pt. ii. p. 44, footnote. Pal. Soc. 1888. 



2 Untere Dogger, Abli. geol. spez. karte Elsass-Lothringeu, Bd. II. pi. i. fig. 8, 



