The Devonica and Magnifica megaspore zones (Frasnian-Famennian) are identified in the Imperial Formation at Mountain River. Palynological and lithologic evidence indicates that there is at least 118 m of sediment missing between the Ramparts Formation and the Imperial Formation at Mountain River, as compared with Imperial River and Powell Creek. Erosion at the sub-Cretaceous unconformity removed between 120 and 180 m more sediment at Mountain River than at Imperial River.

On a identifié les zones (Frasniennes-Famenniennes) aux mégaspores Devonica et Magnifica dans la formation Imperial à Mountain River. Les données palynolgiques et lithologiques indiquent qu’à Mountain River, entre les formations Ramparts et Imperial, au moins 118 m de sédiments sont disparus, en comparison des affleurements à Imperial River et à Powell Creek. À Mountain River, l’interval de sédiments enlevés par l’érosion sur la discordance sub-cretacée est plus épais de 120-180 m que celui à Imperial River.

Traduit par Susan Cantlie

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First page of MEGASPORES, IMPERIAL FORMATION (UPPER DEVONIAN), MOUNTAIN RIVER, DISTRICT OF MACKENZIE<alt-title lang="fr">MÉGASPORES DANS LA FORMATION IMPERIAL (DÉVONIENNE SUPÉRIEURE), MOUNTAIN RIVER, DISTRICT DE MACKENZIE</alt-title>
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