Geology of the Boston Basin, Vol. 1: Part III, the Blue Hills Complex (Classic Reprint)
(Excerpt from Geology of the Boston Basin, Vol. 1: Part II...)
Excerpt from Geology of the Boston Basin, Vol. 1: Part III, the Blue Hills Complex
Among the more general and important problems presented by the area here outlined are: first, the age of the older slate and its relations to the granite; second, the structural relations of this Complex to the sedimentary deposits of both the Boston and Norfolk Basins; and third, the true stratigraphic positions of these newer formations. Fortunately, the first problem, the age of the older slates, finds an easy and satisfactory solu tion in the occurrence in it, at several points, of a Cambrian fauna. There seems to be no reason to doubt that this older or Cambrian slate is the oldest formation now exposed in the entire Blue Hills region; and we thus have the satisfaction. Which was denied us in the Hingham and Nantasket areas, of a well-determined and definite base or starting point for our stratigraphic study.
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