Re your 2 samples from St. Lawrence Island and one from Selawik quad., Alaska.

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Brief statement of problem and remarks (from collector):
Sample is from an isolated cutbank of tilted gravels at the north edge of the Selawik Hills. These gravels are unique and nowhere in this part of the Selawik basin have we found anything comparable. They are composed almost entirely of granitic debris, derived no doubt from the nearby Selawik Hills pluton. They are completely lacking, however, in clasts of the late Cenozoic olivine basalts which are equally widespread in this part of the Selawik Hills. This suggests a pre-Pleistocene age. The sample, a lignitic coal, was found at the base of the cutbank in the bed of a small stream. Although the coal was not actually found in place, I am reasonably convinced that it is part of the tilted gravel sequence. The only other rocks exposed in this general area are Cretaceous granites and volcanics and horizontal Pleistocene basalt flows.

The degree of consolidation of the gravels and the character of the lignite suggests a post-Cretaceous age.

Have scrubbed the coal samples to remove contamination materials.