"Monday was a better day for [46] us and at 4:30 that afternoon we had an additional 90 miles to our credit, and Tuesday was still more satisfac- tory, a run of 152 miles with a good stiff breeze bringing us to anchor at Upernivik at seven o'clock in the evening. The wonderful basalt- cliffs which we first noticed on the islands in Disko Bay extend beyond Umanak Fjord to Keker- tarsuak Island, thus forming more than 200 miles of the coast. The thous- ands of beds of lava and lapilli which make up the cliffs and moun- tains are striking evidence of the tremendous volcanic activity that characterized this part of Greenland during the same geological era, the Tertiary, when lavas were build-