That the Paleozoic rocks of the Saint Lawrence Valley are gently undulatory is no new announcement, though it may be so regarded for the area immediately under discussion, namely, the Canton, New York, topographic quadrangle. These undulations were described on the Canadian side of the river as early as 1863 by Logan,2 and again more recently by Cushing for the Watertown district3 on the New York side. The present paper records their extension into the Ogdensburg-Canton quadrangles and discusses the evidence as to their origin and their relation to the belts of pre-Cambrian rocks beneath. The location of the two quadrangles is indicated on the key map, figure 1.
Though the country is heavily drift-mantled, yielding few exposures, when the latter are plotted and connected up with regard to strike and to topography there results a pattern of outcrop sufficiently complicated (and likely to . . .