RANDOM, A PRE-CAMBKIAN UPPER AL.GONKIAN TERRANE 6 



Following the presentation of this paper the Society adjourned, at 

 12.35 o'clock, for the noon recess. 



At 1.45 o'clock p m the Society reconvened, and the three following 

 papers were read by title : 



GEOLOGY OF OAHU, HA W A II AN ISLANDS 

 BY C. H. HITCHCOCK 



The paper is printed in full in this volume. 



RANDOM, A PBE-CAMBRIAN UPPER ALGONKIAN TERRANE 

 BY CHARLES D. WALCOTT 



In a paper presented to this Society at its last meeting I gave a description of 

 the Avalon series of Newfoundland.* Therein it was stated that the Signal Hill 

 sandstone and conglomerate caps the series, the Cambrian resting unconformably 

 on the basal terra ne of the Avalon series and overlapping on the Archean. No 

 transition beds were known between the Signal Hill terrane and the Cambrian. 

 Subsequently Mr G. F. Matthew published an article entitled "A Paleozoic Ter- 

 rane beneath the Cambrian," f in which he referred the greater portion of the 

 red and green shales, with their interbedded limestones, on Smith sound and 

 Trinity bay, Newfoundland, to a pre-Cambrian terrane. These shales and lime- 

 stones were correlated with similar beds on Hanford brook, New Brunswick, to 

 which he had given the name " Etcheminian." 



In June, 1899, accompanied by Mr S. Ward Loper to assist in collecting fossils, 

 I visited Smith sound, and at Smith point found the Olenellus fauna 369 feet below 

 the summit of the Etcheminian, and one of its types, Coleoloides typicalis, in the 

 basal bed of the Cambrian, on the south side of Random island. This retains the 

 Etcheminian of Newfoundland in the Lower Cambrian, to which the strata rep- 

 resenting it on Manuels river were referred by me in 1888. On a second visit to 

 the Smith Sound section later in the month, Mr J. P. Howley accompanied us, and 

 for seventeen days we worked on the Cambrian and pre-Cambrian formations 

 about Trinity and Conception bays. The Lower Cambrian rocks of the Smith 

 Point section are concealed at a point 44 L feet beneath a thick bed of limestone, 

 characterized by the presence of a great number of Hyolithes of various species 

 and by Olenellus and Agraulos in its upper portion. This limestone is 369 feet 

 beneath the conglomerate bed, which Mr Matthew places at the base of the Cam- 

 brian zone.J East of the interval covered by soil occurs a section 107 feet thick 

 that evidently belongs to an older series, although it retains the same dip and 

 strike as the reddish purple and green shales of the Lower Cambrian. The sec- 

 tion exposed is as follows, downward: 



* Bull. Geol. Soc. Am., vol. 10, pp. 218-220. 



f Annals N. Y. Acad. Sci , vol. xii, 1899, pp. 41-5G. 



\ Ann. Rept. New York Acad. Sci. ? vol. xii, 1899, p, 46, and section fig. 3, p. 48, 



