CGRG Bibliography of Canadian Geomorphology
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Author : Dionne, J-C.
Date : 1994
Title : LONG-DISTANCE TRANSPORTED ERRATICS AT THE ENTRY OF THE SAGUENAY RIVER [Les erratiques lointains de l'embouchure du Saguenay, Québec.]
Publication : Geographie physique et Quaternaire
Issue : 48(2):
Page(s) : 179-184
Abstract
Long-distance transported erratics at the entry of the Saguenay River. Many hundred erratics have been observed and mapped at the mouth of the Saguenay Fjord, both on the present shoreline cut into Quaternary deposits and in situ in these deposits. Two groups of indicators have been recognized: those of distal origin (400 to 500 km) and those of proximal origin (100 to 200 km). The first group of erratics is composed mainly of the following Precambrian lithologies: conglomerate, stromatolitic dolostone, and various kinds of dolostones. The second group is dominated by Ordovician (Trenton) limestone and anorthosite clasts. Based on the glacial flow in the Saguenay area (determined from striaes, and other micro- forms), the limestone erratics originated from the Upper Saguenay area (Saint-Honore) or from the southern part of Lac Saint-Jean; similarly the anorthosite erratics are from the large anorthosite massif located in the Saguenay-Lac Saint-Jean area. Tillite and dolostone erratics originated from the area of Mistassini, Albanel and Waconichi lakes in the central Quebec area. This implies a Wisconsinan glacial flow to the SE from that area downstream the Saguenay Fjord (Tadoussac), and consequently the existence of a dome and a regional ice divide located somewhere to the W or the NW of the Lac Mistassini basin. These data emphasize the validity of the models suggested recently by a few workers and stress the interest of mapping long-distance transported erratics to determine more accurately the major ice flows.
Bibliography of Canadian Geomorphology