Abstract
Beds and lenses of coal and veins of anthraxolite are common occurrences in relatively unmetamorphosed Precambrian sediments of the Lake Superior region. Anthraxolite is the name for a black, combustible coallike solid found in Precambrian rocks. Anthraxolite resembles anthracite coal in many ways but occurs in veins and fissures which cut across bedding. Anthraxolite was regarded as having been formed by very low grade metamorphism of liquid bitumens that were probably derived from living organisms. Anthraxolite was studied using modern methods of chemical analysis and compound identification which have been so successful in elucidating the structures and compositions of various coals. Since the major steps in the catagenesis of organic material in coal, as it passes from low to high rank, are reasonably well understood and fairly well defined chemically, it appears possible to correlate the chemical age of the organic matter in anthraxolites with ages determined by radiometric dating. 28 references.
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