282 MK. s. s. bijckma:n' on [vol. Ixxiii, 



Appendix II. 

 Matee-Etmae's Steatiqeaphical Teems. 



Since this communication was read Dr. A. Morle}^ Davies has- 

 kindly brought to my notice a paper by Mayer-Eymar contain- 

 ing a scheme of stratigraphical terms. This paper seems to have 

 been overlooked generally, perhaps on account of its rarity. As 

 there is no copy in the G-eological Society's Library it seems- 

 desirable to transcribe the necessary poi-tion. I am much indebted 

 to the com'tesy of Prof. Watts for the opportunity to do so. The 

 paper is entitled 'Die Filation der Belemnites acuti ' (Vierteljahr- 

 schrift der Ziircher Natvirforschenden Gresellschaft, April 1884), 

 and the stratigraphical scheme is to explain the sequence of strata 

 containing these belemnites. The author speaks of a previous- 

 scheme published three years earlier : substantially the same, one 

 may presume, but I have not been able to see it. I am, however, 

 indebted to our Librarian, Mr. C. P. Chat\dn, for bringing to my 

 notice in answer to my enquiries about this prior paper, another 

 communication by the author in the same year (1884) — a paper 

 of eight lithographed folios giving a classification of all strata. 



The following Table XI (p. 283) is the table in the pamphlet 

 first cited, with certain correlations. 



By the side of Mayer-Eymar's table are placed the divisions 

 adopted in the present communication, and, alongside those, 

 Quenstedt's divisions of the Lias ; but it cannot be claimed that 

 the Swiss author's divisions are rightly interpreted. For instance, 

 it is doubtful whether the Hwiccian is correcth^ correlated with his- 

 Mendin : that may be intended for the lower part of the Domerian ; 

 and perhaps it is incorrect to leave the Raasayan without equi- 

 valent: some of the basal strata of the Rottorfin and upper horizons 

 of the Balingin may fall within its limits. But Continental 

 authors have apparently only had the opportunity of seeing isolated 

 fragments of strata of Raasayan date, and may perhaps have 

 correlated these fragments criss-cross, placing earlier strata of one 

 locality above later strata of another. We had certainly done that 

 in this country before the Raasay deposits gave the clue. 



Had I known about Mayer-Eymar's scheme I should have 

 hesitated to propose some of the new terms ; but my terms were 

 in print before his paper came to my notice. ^ So I must leave 

 selection in the hands of my fellow- workers. 



1 Abs. Proc. Geol. Soc. 1916-17, No. 1009, p. 84. 



