No. l8.] TRIASSIC FISHES OF CONNECTICUT. 25 



Newark rocks to a time interval between the Trias and Lias, 

 for which there is no corresponding European expression.^ 



Most recently of all it has been claimed by the present writer/ 

 in contrast to the views of Agassiz and Newberry, that the 

 Newark fish fauna of the Atlantic border region does, in reality, 

 manifest rather close relationship to those of certain European 

 formations; and in particular that a marked correspondence 

 exists between it and the assemblage that is known from, the top- 

 most member of the Alpine Muschelkalk — that is to say, the 

 summital portion of the Middle Trias as developed in the 

 Mediterranean region. The precise horizon from which the 

 foreign assemblage in question has been obtained is the so-called 

 Perledo limestone, on the eastern verge of Lake Como, in 

 Lombardy, and usually correlated with the base of the Buchen- 

 stein beds.' By some authors the latter are referred to the base 

 of the Ladinian, by others — and these would seem to be in 

 the minority — to the summit of the Virglorian (zone of 

 Ceratites trinodosus). Under these names, Ladinian and Vir- 

 glorian, are understood respectively the upper and lower mem- 

 bers of the Alpine Muschelkalk, where, as is well known, a three- 

 fold division such as characterizes the deposits of Germany 

 north of the Alpine region is not observable.^ The position of 

 the Buchenstein limestone, and also of the higher (Keuper) 

 fish-bearing beds of Besano, Raibl, Seefeld, etc., as compared 

 with the Anglo-German Trias, is shown in the subjoined table. 

 This is constructed more especially after the writings of Baron 

 F. von Huene on the British, and those of Professors Haug, 

 Arthaber and others on the Alpine Trias.^ 



> Agassiz, L., Proc. Am. Acad., 1852-57, iii, p. 69. 



' Geol. Surv. N. J., Ann. Rep. for 1904 (i905)> PP. 7°. 72- 



* A convenient geological guide for the Como section will be found in chapter i 

 of Dr A. Tornquist's " Fuhrer durch das oberitalienische Seengebirge," forming 

 volume 9 of the Sammlung geologischer Fuhrer (Berlin, 1902). 



•■ " Le Trias moyen comprend, comme on salt, deux etages: le Virglorien Ren. 

 (= Recoarien Bittn., Anisien Mojs., Waag., Dien.), et le Ladinien Bittn." — E. Haug, 

 in Bull. Soc. Geol. France, 1906, ser. 4, vi, p. 368. 



= A generalized section of the Alpine Trias is given at page 254 of G. von Artha- 

 ber's treatise, incorporated with the second part of Freeh's " Lethaea Geognostica " 

 (Heft 2, 1905), and a more detailed section of the Como district at page 399 of the 

 same work. Heft i of this volume contains an introduction, by the editor, to the 

 study of the Mesozoic and Trias, and a description of the Continental Trias by 

 E Phillippi in collaboration with other authors (1903). See also the following by 

 F von Huene: " Eine Zusamraenstellung uber die englische Trias und das Alter 

 ih'rer Fossilien. Centralbl. f. Mineral. Geol. Pal, 1908, pp. 9-17- A slightly different 

 arrangement is indicated in the table given at p. 29 of G. De-AIessandri's memoir on 

 the Triassic Fishes of Lombardy, 1910. 



