Viséan

(redirected from Visean)

Viséan

[vi′sā·ən]
(geology)
A European stage of lower Carboniferous geologic time forming the lowermost Upper Mississippian, above Tournaisian and below lower Namurian.
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Eurypterids from the Visean of East Kirkton, West Lothian, Scotland.
The age attributed to the Maliman Formation and equivalent units, from invertebrates and palaeoflora, is late Tournaisian-early Visean; the Cortaderas Formation is late Visean, based on palynomorphs (references in Cesari et al.
100[degrees]C, with the maximum burial episodes between the Frasnian and Lower Visean, in a time span of ca.
Scorpions from the Visean of East Kirkton, West Lothian, Scotland, with a revision of the infraorder Mesoscorpionina.
The reservoir formation to be tapped is situated at a depth of 1,800 m in a karst limestone dated Visean (upper paleozoic).
These wells are intended to raise additional production from the Visean aged reservoirs (B-sand) and to appraise and develop the deeper Tournaisian (T-sand) and Devonian (D-sand) aged reservoirs.
2006): Development of a late Visean (Mississippian) mixed carbonate/siliciclastic platform in the Guadalmellato Valley (southwestren Spain).
The limestone is part of the Galway-Roscommon Shelf, a Visean succession that consists almost entirely of limestones of shallow-water shelf facies extending from east County Clare and County Galway in the south, to counties Mayo and Roscommon in the north (Sevastopulo and Wyse Jackson, 2001).
Mounds with a packstone fabric also have been reported from the Fort Payne Formation of Kentucky (Ausich and Meyer, 1990) and Visean strata of Ireland and England (Lees and Miller, 1995).
The volcanics are overlain by carboniferous shales of Upper Visean age.