The James M. DuPont Meteorite Collection - and larger linear polyring aromatics have not been identified in extracts of soils or marine sediments. Carruthers'' has isolated some alkylanthracenes from crude oils; but in petroleum also, phenanthrenes are much more abundant than anthracenes. Sedimental extracts can be divided into two broad classes: (1) soil or aerobic, and (2) marine sediment or anaerobic. Overlaps do exist. Anaerobes and aerobes both live in soils and marine sediments, but aerobes appear dominant in most soils. Soil extracts normally contain more wax-esters and less free sulfur and aromatic hydrocarbons than do extracts of marine sediments.' •'' Although the same molecular structures appear to be present''* in sedi- mental hydrocarbons,
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