Tertiary rocks are extensively developed in the central basin of Vestspitsbergen, where they comprise some 6,000 feet of mainly shallow marine or estuarine sandstones and shales, Paleocene and Eocene in age, with coal-bearing units in the basal and uppermost parts of the succession. The Tertiary is also represented in four isolated areas along the west coast; of these, the occurrences at Kingsbay and Oeyrlandet are considered outliers of the central basin beds, whereas those of Kapp Lyell and the east and west shores of Foreland Sound are regarded on the basis of paleobotanic evidence as equivalent to or younger than the upper sandstones of the central basin. The latter view is supported by structural evidence.

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