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The AAPG/Datapages Combined Publications Database
CSPG Special Publications
Abstract
Boundaries and Correlations
Silurian-Devonian relationships, Charlo map-area, New Brunswick
Abstract
Geological field work in the Charlo area on Chaleur Bay, New Brunswick, has revealed some 14 mappable units of sedimentary and extrusive and intrusive igneous rocks. The rhyolitic Benjamin Formation succeeds the New Mills Redbeds; these in turn lie unconformably upon fossiliferous beds of the Nash Creek Formation, which is in part Wenlock in age. The oldest Devonian formation, the Louison Creek mudstone and limestone unit, contains a New Scotland (earliest Devonian) fauna in abundance and, since it is followed by palagonite tuff-bearing extrusives as in the type Dal housie, it is correlated with Zone O of that section.
Although no actual Silurian-Devonian contact is exposed, it appears that vulcanism in the Late Silurian was succeeded by Early Devonian stable-shelf carbonates; quite likely a hiatus and disconformity lie between.
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