obduction

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obduction

[əbduk′shən]
Etymology: L, obductio, a covering
a forensic medical autopsy.
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This model is preferred to one that involves widespread uplift of the Gander margin and removal by erosion of the uppermost strata of the Miramichi Group (plus any or most obducted Penobscot Arc rocks).
Erosion of a possibly uplifted Gander margin during the Tremadoc-early Arenig may have removed extensive Miramichi strata and obducted arc before deposition of the middle to late Arenig conglomerate and volcanic rocks of the Napadogan and Lunksoos areas.
The volcanic clasts and detritus in these two localities may have been derived from three possible sources: from volcanic rocks intercalated in the upper layers of the Miramichi-Grand Pitch strata (a possible local source only, given the general absence of such volcanic rocks in present-day strata, but probably not in these two localities); from obducted Penobscot Arc rocks lying structurally above the Miramichi-Grand Pitch strata (quite plausible but the age and tectonic setting of the volcanic clasts must be determined by isotopic and geochemical analyses); and from hypothetical volcanic rocks formed along the rifts and essentially the same age as the conglomerate (theoretically possible but judged improbable because volcanic strata are lacking in the conglomerate units).