304 R. R. GURLEY 
vician (Upper Graptolite schists of Sweden). In the Upper Calciferous shales of 
Nevada, many specimens of Phyllograptus occur, some of which, not being well enough 
preserved to show all the Phyllograptus structure, present a deceptive folzwm aspect. 
Whether this is the explanation of Ami’s folium or not I cannot say, as I have not 
seen the specimens. 
1 Chazy.—Little is known in regard to the graptolite fauna of this horizon. In 
Nevada, Didymograpsus bifidus Hall, occurs in strata certainly supra-Calciferous and 
probably Chazy horizon ( fide oral statement of C. D. Walcott.) 
In a small collection from the Chazy at Mystic, Canada, a few poorly preserved 
(mostly fragmentary) graptolites were seen. Only Diplograpsis foliaceus Murch. (mtd. 
amplexicaule Hall), and Cryptograptus tricornis Carr., could be determined with any 
certainty. Some Didymograpsus fragments of two species completed the collection. 
Further, somewhere between the Dichograpsus fauna characteristic of the Calcif- 
erous, and the Dicellograpsus faunas, characteristic of the (certainly pre-Utican and 
probably) Trenton, are to be placed the faunas occurring in the beds at Kicking 
Horse (Wapta) Pass, Rocky Mountains (Lapworth, 1886, Ann. Rep. Geol. Surv. Can., 
Il., pp. 22D—24D; also Science, 1887, IX., p. 320), and those along Dease River, 
British Columbia (Lapworth, 1889, Ann. Rep. Geol. Surv. Can., III., pp. 94B, 95B; 
also Can. Rec. Sci., III., pp. 141, 142). Approximately at least, these beds are of the 
same age, and in a general way, and as a diagnosis by exclusion, may be said to be 
Chazy. 
12 Tyenton-Lorraine.— Besides faunas already recorded, the following collections 
have been studied : 
Lower Dicellograpsus zone ; Lower Falls, Kinderhook Creek, near Stockport, N. Y. 
About three tons of excellent material collected by the author. Also a rather small 
collection from Schodack Landing, N. Y. 
Upper Dicellograpsus zone: Large collection from Magog, Canada. 
Graptolite Zones—As remarked by Lapworth (Trans. Roy. Soc. Can for 1886, V., 
Sec. IV., p. 176), the Trenton limestone should, in all probability be regarded as a 
deep-water deposit. Its age not improbably embraces both the Lower and Upper 
Dicellograpsus zones. Briefly the evidence is: 
(a) At Schodack Landing, Rensselaer county, N. Y., Ford (Amer. Jour. Sci., 1884, 
XXVIIL., p. 206) found the Lower Dicellograpsus fauna associated with a brachiopod 
fauna which, as regards age, may be anywhere from Trenton to Lorraine, but cannot 
be pre-Trenton. 
(4) In spite of assertions to the contrary, the graptolite faunas of the Decellograpsus 
zones are not only identical with, but are strongly contrasted to those of the Utica shale 
proper (that of the Mohawk Valley). And Lapworth’s statement that, with the 
asserted exception of five species, not a shadow of paleontological evidence has yet 
been adduced to show that these Norman’s Kill or Marsouin rocks are newer than the 
Trenton,” is fully justified (doc. cz#., p. 171). 
(c) Parallelism with European (principally British) stratigraphy, strongly con- 
firms the order of superposition suggested by the faunas, viz., in ascending order : . 
Lower Dicellograpsus zone 
Upper Dicellograpsus zone \ 
Utica. 
=Trenton (?) 
