Conodont assemblages of the Gėluva (Lower Silurian) regional stage of Lithuania

Šileikytė, Auksė; Brazauskas, Antanas

doi:10.2478/v10056-008-0003-8

Cited by 2 publications

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“…O. siluricus was found at the depth of 1297.1 m. In Lithuanian sections, this species is usually found lower than O. b. longa and sometimes overlaps with the lower part of this biozone (Brazauskas 1993;Š ileikytė & Brazauskas 2008). The second species, C. murchisoni, was found at a depth of 1302 m (Fig.…”

Section: Ctenognathodus Murchisoni Pander and Oulodus Siluricus (Branmentioning

confidence: 95%

Integrated middle–upper Homerian (Silurian) stratigraphy of the Viduklė-61 well, Lithuania

Radzevičius

Spiridonov

Brazauskas

2014

GFF

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Integrated lithostratigraphical, cyclostratigraphical, graptolite and conodont biostratigraphical and chemostratigraphical (d 13 C) data are presented from the upper Jaagarahu, Gėluva and Dubysa regional stages, including the lundgreni Event (middle Homerian) in the Viduklė-61 well, Lithuania. The Viduklė-61 well is located in the west of Lithuania in the deep-water facies zone. Because of its completeness, this section is the "keystone" for middle-upper Homerian stratigraphy that allows us to combine different kinds of data into a coherent picture of large-scale biotic and environmental turnover. Three formations are distinguished: the upper part of the Riga Formation, with the Ančia Member in the uppermost part, the Siesartis Formation and the lower part of Dubysa Formation. The Grötlingbo bentonite is in the upper part of Ančia Member. In the Gėluva regional stage, two 4th-order and six 5th-order cycles have been distinguished. In the studied interval of the Viduklė-61 core, the following graptolite biozones were recognized: lundgreni (upper part), parvus, nassa, praedeubeli, deubeli, ludensis and nilssoni (lower part). Conodonts enabled recognition of the bohemica longa Biozone. A single find of Ctenognathodus murchisoni Pander in the nassa graptolite interzone indicates an earlier than previously thought origin of this species.

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Section: Ctenognathodus Murchisoni Pander and Oulodus Siluricus (Branmentioning

confidence: 95%