The comparison of certain genera representative of the ichthyofauna of the Escuminac Formation (Quebec, Canada) with those coming from contemporaneous deposits (Upper Devonian, Frasnian) located in the Baltic countries (U.S.S.R.), Western Australia, Nevada (U.S.A.), and Germany provides new evidence against a lacustrine origin of the Escuminac Formation. It is suggested that the Escuminac Formation was deposited in a coastal marine environment. This hypothesis is supported by results of a geochemical study.

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