American geologists have quite generally held to the view that the former extent of the Newark system along the Atlantic border was not much greater than at present, the assumption being made that the deposits were laid down in local basins practically coextensive with the present Newark areas. Russell alone of those who have made special study of the system has advocated a “broad terrane” as against a “local basin” hypothesis for the origin of these deposits.* Davis has expressed the view that the Newark trough of the Connecticut valley was at least 8 or 10 miles wider than the present valley,† but he has thrown the weight of his authority in favor of a strictly “local basin” of deposition. Shaler and Woodworth in their joint monograph treating of the Richmond basin discuss the evidence from that area without reaching a very definite conclusion, . . .