will eventually obliterate. Uplift has already raised the region 325 feet higher than it was when Pleistocene submergence reached its maximum.
The shape of Hamilton inlet appears to justify its classification as a ria. This disposition or classification of Hamilton inlet places it in a category of coast-line features which includes both river estuaries and indentations of the seacoast with sides which diverge seawards. The implications of this classification of the shore and coastal forms known as The Narrows and Hamilton inlet as regards the junction of the river mouth and seacoast are not very definite or specific. They appear, however, to preclude placing it farther inland than the junction of Double Mer and The Narrows valleys. Some geographers might consider it simpler to regard Hamilton inlet as a river estuary, and place the union of seacoast and river much farther eastward, where the coast-line takes its normal trend toward the north and south.
The sharp contrast between the coastal and interior climates is without parallel in any other near-shore region known to the writer. Floating ice may be found on the waters of Hamilton inlet throughout the summer, but ice is unknown in The Narrows or Double Mer after early July. The contrasts between the sub-Arctic climate of the coast and the summer climate of the interior are due to the Labrador current and the floe-ice which it bears southward along the Labrador shore. A journey from the eastern part of Hamilton inlet up lake Melville is, as Holme remarked, “ like passing from winter to summer.”
The forests also afford a fairly definite index to the climatic change in passing from the icebound coast to the much milder interior. The seacoast is either entirely barren or characterized by small patches of forest with dwarfed trees.
Some of the plants furnish in their distribution important evidence from the botanical viewpoint on the question of the western limit of salt water. This evidence is reflected in the distribution of the halophytes or salt-loving plants.
Perhaps the most striking evidence relating to the western limit of marine conditions is furnished by the distribution (Figure 6) of two of the most abundant sea-shells known on the Labrador coast, Balanus balanus (L.) and Littorina rudis var. groenlandica.
The table of specific gravity and temperature of the waters supplement the biological evidence in showing the great change which the physical character of the water undergoes west of Indian Harbour.
The rocks of the region belong chiefly to Precambrian terrains. Differentiation of these has not been attempted beyond recognizing the very distinctive character of Packard’s Domino gneiss.
The Palæozoic sandstone which Low considered to be of Cambrian age was found in Double Mer basin where its occurrence was previously unknown (Figure 4), and the name Double Mer sandstone given to it.
A Pleistocene fauna hitherto unrecognized in this region was found at various points in Lake Melville basin. Many of the fossils in it are partly or completely enclosed in concretions (Plates XVI and XVII). Well-
developed terraces were found as far inland as the reconnaissance extended—about 165 miles from the coast (See Figures 4, 8, 9, and 10, and Plate XIII B). Beautifully laminated Postglacial clay occurs in certain inland sections (Plate XV). The stratigraphic equivalence of the fine muds and the sand-terraces now forming and the tendency of the latter to overlap the former was observed at various localities (Figure 10).
The evidence of the terrace is interpreted to indicate an elevation of the coast since the Postglacial submergence amounting to about 325 feet.