OCCURRENCE OF TOMMOTIAN SEDIMENTS (EARLY CAMBRIAN) ON ST-PIERRE AND MIQUELON

The recently completed 1:50,000-scale resurvey of Saint-Pierre and Miq uelon archipelago has modified significantly previous geological inter pretations of data from this French territory which lies off the easte rn coast of Canada. The newly established lithostratigraphical scheme for its Early Palaeozoic sedimentary succession on Langlade is consist ent with the nearby Newfoundland scheme for virtually identical Lower and Middle Cambrian rocks in the Avalon Terrane. The oldest exposed be ds are fossiliferous and equivalent to Members 3, 4 and 5 of the Chape l Island Formation as defined on the Burin Peninsula of Newfoundland. The Langlade rocks contain the same faunas as their Newfoundland equiv alents, notable among which is the earliest shelly Aldanella attlebore nsis - Watsonella crosbyi - Ladatbeca cylindrica assemblage in the old est exposed rocks, proving the presence of Tommotian strata in the arc hipelago.