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May, 1963 V LIBRARY t^MBM Among the marine invertebrate megafossils in the Triassic rocks of Alaska, halobiid and monotid pelecypods are the most useful stratigraphic indices. By a large margin they are the most "widely distributed of Triassic megafossils in Alaska, and they are represented by species with fairly restricted stratigraphic ranges. Ammonites would in most cases provide more refined stratigraphic age assignments, but with a few notable exceptions ammonite faunas are scarce in the Alaskan Triassic, and where present they are generally accompanied by halobiid or monotid pelecypods.

Field guide to halobiid and monotid pelecypods of the Alaskan Triassic