Franklinian Geosyncline

Franklinian Geosyncline, a linear trough in the Earth’s crust in which rocks of Paleozoic and Late Proterozoic age—about 600 million to 350 million years old—were deposited along the northern border of North America, from the northern coast of Greenland on the east, through the Arctic Islands of Canada, probably as far as northern Alaska to the west. Eugeosynclinal rocks (those of volcanic or deepwater character) are exposed in northern Ellesmere Island; elsewhere all exposed rocks...