The Hirnantian fauna of the Perce area (Quebec) and the Ordovician-Silurian boundary

Lespérance, Pierre J.

doi:10.2475/ajs.274.1.10

Cited by 22 publications

(13 citation statements)

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“…At present, the extension of this African fauna Riva (1981) in Gasp6, associated with a Hirnantia fauna (Lesperance 1974 …”

Section: Palaeogeographymentioning

confidence: 91%

The lower Silurian graptolites of Oued In Djerane: a study of populations at the Ordovician-Silurian boundary

Legrand

1986

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Summary Three zones can be distinguished in the Oued in Djerane region, Algerian Sahara, from the bottom to the top: Climacograptus (Climacograptus) tilokensis sp. nov. Zone; Diplograptus(?) kiliani Zone; Glyptograptus (Glyptograptus) tariti Zone. An example of a detailed study of the different forms of the Climacograptus (Climacograptus) normalis group is given. In addition the problem of the Ordovician-Silurian boundary and its application to the Algerian Sahara sequence is discussed.

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“…At present, the extension of this African fauna Riva (1981) in Gasp6, associated with a Hirnantia fauna (Lesperance 1974 …”

Section: Palaeogeographymentioning

confidence: 91%

The lower Silurian graptolites of Oued In Djerane: a study of populations at the Ordovician-Silurian boundary

Legrand

1986

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“…(Havlíček 1989). Endemism is significant in the Hirnantian faunas (Lespérance 1974). According to Rong &Harper (1988), andSheehan (2001) the Hirnantia fauna extended from the circumpolar sphere into the temperate to tropical zones from the cold water environment of the Tindouf Basin (Morocco) to the South Sweden, Oslo-Asker District in Norway, and Ireland in proximity to the carbonate platforms (Havlíček 1989).…”

Section: Geographic Distribution -The Modiolopsis Pragensismentioning

confidence: 99%

Uppermost Ordovician bivalves from the Prague Basin (Hirnantian, Perunica, Bohemia)

Kříž¹,

Steinová²

2009

Bull. Geosci.

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“…Brief reference to true Ashgill rocks was first made by Cave in 1965 (pp. Recently, however, Lesperance (1974) and Ziegler, Rickards & McKerrow (1974), relying on Wade's older account (1911, p. 430), reasserted the belief in an Ashgill age for the black shales and suggested that at their summit they spanned the Ordovician-Silurian boundary. 282, 287) and graptolites from its Pen-y-garnedd Shale member compared with those from the Pen-y-garnedd Shales cropping-out along the southern Berwyns.…”

Section: Introductionmentioning

confidence: 99%

The Ashgill Series near Welshpool, North Wales

Cave

Price

1978

Geol. Mag.

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SummaryThe name Trawscoed Mudstone Formation is proposed for previously undescribed mudstones cropping-out between the Caradoc Nod Glas Formation (‘Gwern-y-Brain Group’ of Wade, 1911) and the overstepping Rhuddanian Powis Castle Conglomerate Formation some 5 km NW of Welshpool, North Wales. The mudstones have a fauna, dominated by brachiopods and trilobites, which indicates that they are contained within the Cautleyan Stage of the Ashgill Series and suggests deposition in a deep shelf environment.

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The Hirnantian fauna of the Perce area (Quebec) and the Ordovician-Silurian boundary

Cited by 22 publications

References 0 publications

The lower Silurian graptolites of Oued In Djerane: a study of populations at the Ordovician-Silurian boundary

The lower Silurian graptolites of Oued In Djerane: a study of populations at the Ordovician-Silurian boundary

Uppermost Ordovician bivalves from the Prague Basin (Hirnantian, Perunica, Bohemia)

The Ashgill Series near Welshpool, North Wales

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