This brief hydrology of the Newfoundland and Scotian slopes, and of the Georges bank during summer 1962 links together two sectors that are mostly treated separately by Canadian and American scientists. It enabled us to show the different well-known formations that overlap in this region as well as to provide original details which could impact the localization of fishing areas. The extension of the waters of the Gulf of St. Lawrence, more or less mixed with continental waters is perceptible in the surface layer, as far as the Gulf of Maine. In this area, but also on the Georges Bank, the situation is quite similar to that presented by BIGELOW in 1924. Above, from 20 to 40 m and to an average of 130 m deep, the cold middle layer can be found, and all the way to the south of the considered area. This cold layer is created by the Labradorian waters which flow around the Newfoundland banks and mix as they circulate, in a lesser quantity, in the Gulf of St. Lawrence before flowing out through the Cabot Strait. This layer bathes some shoals in Nova Scotia then overflows around the Azores where it forms a "cold roll" already described by RALLIER DU BATY (1926)....
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