Crystalline Limestones of Warren Co., X.J. — Westgate. 373 
accepted the Archaean age of these limestones are Vanuxem 
and Keating,* Kitchell,f Cook, J Kritton,§ Dana,|| and H. S. 
Williams. •"" These writers consider the crystalline limestones 
to be distinct from the blue Cambrian limestone of Kittatinny 
valley. 
The other view is that these limestones are not true mem- 
bers of the crystalline series, as has generally been supposed, 
but are of Cambrian age. The supporters of this theory claim 
that the crystalline limestones belong to the same formation 
as the blue magnesian limestone (proved Cambrian by its fos- 
sils), which outcrops along the eastern border of the Kitta- 
tinny valley, and that they have been locally metamorphosed 
by intrusions of igneous rocks. This view was first proposed 
by H. D. Rogers in 1840.** It found no further support until 
Nasonff adopted it, giving a large amount of detailed evidence 
in its favor. Kemp and HollickJJ accept the same theory for 
the age of the white crystalline limestones of Warwick, Or- 
ange county, N. Y. The reasons given in support of the iden- 
tity of the crystalline limestone with the blue magnesian lime- 
stone, and consequently of the Cambrian age of the former, 
are, as summarized by Nason, §§ as follows: 
1. The white limestones are continuous with the blue limestones (now 
accepted 'as of Cambrian age) and every degree of transition may he- 
found between them. 
2. Both have the same dip and strike 
:;. Both arc conformable with a quartzite also containing Cambrian 
fossils. 
*Jour. Phila. Acad. Nat. Sci.. vol ir, pp. 277-288. 
+Secoml Ann. Kepi. Geol. Survey of X. .1. for L855, pp. 111-248. 
JGeologj of New Jersey, 1868, pp. 309-321, and in later annual reports. 
§Ann. Kept, state Geol. for 1885, pp. ::<;-.">:». Same for 1886, pp. 74-112. 
||Am. .lour. Sci.. III. vol. xt.u. 1891, pp. 70-72. 
•Am. .lour. Sci., III. vol. xi.\ n. 1894. pp. 101-402. 
**Final Report of the Geologj of N. J., 1840. 
Hln the Annual Report of the New Jersey Survey for 1890, pp. 25-50. 
Van I lise in Bulletin 86, U. S. Geol. Survey, "Archeao and Algonkian," 
pp. 399-404, and Nason in Am. Geologist, vol. vir. pp. 241-252, give a 
full bibliography of this subject. Other papers by Nason on this sub- 
ject have since appeared in the American Geologist and in the Bulle- 
tin of the Geological Society of America. In the Am. Geologist for 
September, 1894, vol. xiv. pp. 161-169, is a Bummary of the facts brought 
forward by him to. prove the Cambrian age of these crystalline lime- 
stones in Sussex county. 
;;.\ini;il> X. Y. Acad. Sci., vol, vn. pp. 638-654. 
^American Geologist, September. 1894, vol. xrv, p. 163. 
