LOWER CAMBRIAN TERRANE 325 



In 1899 Mr. Matthew presents the same arguments as in 1888, 

 to the effect that the strata between the St. John group and the 

 crystalline rocks (Huronian, etc.) are of varying thickness and 

 often absent altogether. From this he infers that the ' Etche- 

 minian' rocks were removed by erosion prior to the deposition 

 of the rocks of the St. John group. ^ 



In the description of the ' Eopalasozoic ' rocks of Smith Sound, 

 N. F., Mr. Matthew states that the strata of the higher terrane 

 have a greater dip than those of the lower (Etcheminian). A 

 diagrammatic figure of a section is introduced, showing the ex- 

 act position of the unconformity. The conglomerate at the 

 base of the Cambrian is described in detail and explanations are 

 given of its probable source.^ He concludes from a hasty ex- 

 amination of the section on Manuels Brook, that the Etcheminian 

 was eroded prior to the deposition of' the Cambrian. He adds : 



It is plain, therefore, that the Etcheminian terrane was entirely 

 eroded at Manuels Brook before the first member of the Cam- 

 brian was laid down, though perhaps the harder calcareous 

 masses remained to contribute to the boulders in the conglomer- 

 ate. This is parallel to the conditions in New Brunswick on 

 the Kennebecasis River, except that there are no limestones or 

 remains of them in that valley, and the Etchminian is entirely 

 wanting.^ 



Hanford Brook. — During the summer of 1899 I visited Han- 

 ford Brook and studied with great interest the geologic struc- 

 ture and stratigraphic succession of the strata referred to the 

 'Etcheminian' and the St. John terranes. I found that the un- 

 conformity on Hanford Brook, shown by Mr. Matthew, between 

 the basal St. John quartzite, Middle Cambrian, and the sub- 

 jacent Lower Cambrian (* Etcheminian') was based on the dif- 

 ference in strike and dip of the Paradoxides and Protolenus 

 beds of the Middle Cambrian and the highest exposed beds of 

 the Lower Cambrian ('Etcheminian'). The two formations do 

 not come in contact, an interval of nearly 300 feet separating 

 them. The lowest beds of the St. John quartzite at Hanford 

 Brook have nearly the same strike and dip as the highest beds 



■ A Paleozoic Terrane beneath the Cambrian : Annals N. Y. Acad. Sci., Vol. 

 XII, 1899, No. 2, pp. 41-56. 

 "Loc. cit., pp. 47-50. 

 'Loc. cit., p. 52. 



