Foraminifera source details
Cózar, P.; Somerville, I. D.; Burgess, I. (2008). New foraminifers in the Visean/Serpukhovian boundary interval of the Lower Limestone Formation, Midland Valley, Scotland. Journal of Paleontology. 82(05): 906-923.
288609
10.1666/07-103.1 [view]
Cózar, P.; Somerville, I. D.; Burgess, I.
2008
New foraminifers in the Visean/Serpukhovian boundary interval of the Lower Limestone Formation, Midland Valley, Scotland
Journal of Paleontology
82(05): 906-923
Publication
Available for editors [request]
The biostratigraphy of the upper part of the Mississippian Lower Limestone Formation in the Midland Valley, Scotland is revised using foraminiferal assemblages. This formation was previously assigned exclusively to the upper part of the Brigantian Substage (upper Cf6δ, P2 or latest Visean), whereas the succeeding Limestone Coal Formation (barren of foraminifers and conodonts) was assigned to the Pendleian Substage (lower Cf7, E1 or early Serpukhovian). The foraminifers, in particular those recorded from the Second Hosie and Top Hosie limestones and their lateral equivalents (Anvil and MacDonald limestones), are comparable to Serpukhovian assemblages from the Ukraine and Russia. Consequently, the Visean/Serpukhovian stage boundary is repositioned at the base of the Second Hosie Limestone. This assignment of the Second Hosie Limestone to the Pendleian is reinforced by the first occurrence of the ammonoid Emstites (Cravenoceras), although it occurs 1 m below the Top Hosie Limestone. Pendleian foraminiferal assemblages from northern England, its geographically closest equivalent, are similar but not well enough known for a detailed comparison. A few similarities are found between the foraminiferal assemblages from the Midland Valley and those from southwest Spain and North African basins. Faunas from the Second and Top Hosie limestones and their lateral equivalents allow us to propose an assemblage zone, valid for regional correlations within the British Isles, and the faunas can be potentially used as Serpukhovian markers for western Paleotethyan basins. Two new genera and species are described, Praeplectostaffella anvilensis n. gen. n. sp. and Praeostaffellina macdonaldensis n. gen. n. sp., and two new species, Tubispirodiscus hosiensis n. sp. and Euxinita pendleiensis n. sp.
Date
action
by
Euxinita pendleiensis Cózar, Somerville & Burgess, 2008 † (original description)
Praeostaffellina Cózar, Somerville & Burgess, 2008 † (original description)
Praeostaffellina macdonaldensis Cózar, Somerville & Burgess, 2008 † (original description)
Praeplectostaffella Cózar, Somerville & Burgess, 2008 † (original description)
Praeplectostaffella anvilensis Cózar, Somerville & Burgess, 2008 † (original description)
Praeplectostaffella asymmetrica (Rozovskaya, 1963) † (new combination reference)
Tubispirodiscus attenuatus (Marfenkova, 1978) † accepted as Betpakodiscus attenuatus (Marfenkova, 1978) † (new combination reference)
Tubispirodiscus cornuspiroides (Brazhnikova & Vdovenko, 1967) † accepted as Betpakodiscus cornuspiroides (Brazhnikova & Vdovenko, 1967) † (new combination reference)
Tubispirodiscus hosiensis Cózar, Somerville & Burgess, 2008 † (original description)
Praeostaffellina Cózar, Somerville & Burgess, 2008 † (original description)
Praeostaffellina macdonaldensis Cózar, Somerville & Burgess, 2008 † (original description)
Praeplectostaffella Cózar, Somerville & Burgess, 2008 † (original description)
Praeplectostaffella anvilensis Cózar, Somerville & Burgess, 2008 † (original description)
Praeplectostaffella asymmetrica (Rozovskaya, 1963) † (new combination reference)
Tubispirodiscus attenuatus (Marfenkova, 1978) † accepted as Betpakodiscus attenuatus (Marfenkova, 1978) † (new combination reference)
Tubispirodiscus cornuspiroides (Brazhnikova & Vdovenko, 1967) † accepted as Betpakodiscus cornuspiroides (Brazhnikova & Vdovenko, 1967) † (new combination reference)
Tubispirodiscus hosiensis Cózar, Somerville & Burgess, 2008 † (original description)