42 The American Geologist. .lanunry. i9ui. 
of Philadelphia. It is apparently a direct counterpart of the work 
noted by Dr. Merrill. It is somewhat remarkable that Lea or Conrad 
should have been unaware of the volume in question and that the 
Marcous should have been unable to record its occurrence. Recently a 
Philadelphia bookseller offered a copy for sale. In regard to the Ger- 
man title mentioned by the Marcous, it may refer to a compilation on 
the geology and mineralogy of North America issued in Hamburg 
about 1827, to which Dr. Troost among others contributed. As far 
as I know this publication contained no map. 
vS". Harbcrt Hamilton. 
New Yokk Academy of Sciences, Section of Geology and Min- 
ERA'.OGY, October 15, 1900. The following notes on the results of the 
summer's work by members were presented : 
Mr. Gilbert van Ingen described the work of the party belonging- 
to the Geological Survey of New Jersey, which, during the past two 
summers, has been engaged in tracing the outcrops of the palaeozoic 
formations of northwestern New Jersej', and collecting fossils. Of 
this partj^ Mr. Kiimmel, the assistant state geologist, traces the bound- 
aries and works out the tectonics, while Dr. Weller, of the University 
of Chicago, collects fossils at localities indicated by Mr. Kiimnifl. 
During July, Mr. van Ingen spent a week with this party in the field 
at Newton. Newton is situated on the shales of the Trenton group, 
there extensively quarried for slates. To the east is a low ridge of 
limestone which presents the same appearance as the Barnagat lime- 
stone along the Hudson river. The upper part of this limestone has 
yielded trilobites, probably Dikcloccphalus, indicating that this por- 
tion is of upper Cambrian age. At other localities a trilobite de- 
scribed by Weller as Liostracus jcrscycnsis, shows that the rock there 
is also Cambrian — probably of the middle or upper division. In the 
vicinity of Franklin Furnace good specimens of Olcnellus cf. thomp- 
soiii were found at localities described by Foerste. Further to the 
east of Newton, on the other side of the Cambrian ridge, is a wide 
belt of Ordovician rocks, — Trenton limestone overlaid by a thick 
series of shales. The limestone contains the typical Trenton faima.^ — 
Raftncsquin, Plectanibonites, Ptcrygoiiicfopv.s etc., — and is very much 
like that found at Rosetown, Ulster Co., and at Rochdale, Duchess 
Co., N. Y. The shale has few fossiliferous beds, but occasionally one 
of the more sandy layers contains Dalinanclla tcstudinaria, Plectani- 
bonites and Rafinesquina, the same combination found in the IJudson 
shales at Poughkeepsie, and at Rondout. At one localitj- was found 
a fauna with Ainpy.v and Harpes. In eastern New York these genera 
of trilobites are found only in the Chazy limestone, and the discovery 
is of great interest in that it indicates the presence of this formation 
at a distance of almost 250 miles south of what has hitherto been 
recognized as its southern limit. Further to the northwest, along the 
Delaware river, were found the Silurian and lower Devonian forma- 
tions. The finest section is seen in the face of the cliff of the old 
Nearpass quarry, about five miles south of Tri-states where all the 
