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Loydell & Nestor, V., 2005

Loydell, D. K. & Nestor, V. 2005. Integrated graptolite and chitinozoan biostratigraphy of the upper Telychian (Llandovery, Silurian) of the Ventspils D-3 core, Latvia. Geological Magazine 142 (4), 369-376. | DOI | DETAILS

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ID724
ReferenceLoydell & Nestor, V., 2005
AuthorLoydell, D. K. & Nestor, V.
Year2005
TitleIntegrated graptolite and chitinozoan biostratigraphy of the upper Telychian (Llandovery, Silurian) of the Ventspils D-3 core, Latvia
JournalGeological Magazine
Volume142
Number4
pgs.369-376
Source typearticle in journal
LanguageEnglish
DOI10.1017/S0016756805000531
AbstractIntegrated graptolite and chitinozoan biostratigraphical data are presented from the upper Telychian (Oktavites spiralis and Cyrtograptus lapworthi graptolite biozones) of the Ventspils D-3 core, Latvia. The base of the Angochitina longicollis chitinozoan Biozone is approximately coincident with that of the spiralis graptolite Biozone, as it is elsewhere in the East Baltic, although in Wales it lies within the upper spiralis graptolite Biozone. Conochitina proboscifera appears in the upper spiralis graptolite Biozone in the Ventspils D-3 core, but at lower and higher horizons elsewhere, presumably reflecting its patchy distribution during the lower part of its stratigraphical range. Ramochitina ruhnuensis appears to be a stratigraphically useful, although geographically restricted, species, appearing at a level close to the base of the lapworthi graptolite Biozone. The most remarkable feature of the Ventspils D-3 chitinozoan record is the very early occurrence, in the upper spiralis graptolite Biozone, of two chitinozoan biozonal index species: Margachitina banwyensis and M. margaritana. Previously, these two taxa were considered unequivocal indicators of the uppermost Telychian to Sheinwoodian or Homerian, respectively.

Sections studied or mentioned

Localitypgs.Figs.Remarks
Ventspils D-3 borehole

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<i><i>Ancyrochitina ansarviensis</i></i><br />Ventspils D-3 borehole, 815.00 m, Telychian ( 423-15) <i><i>Angochitina longicollis</i></i><br />Ventspils D-3 borehole, 827.60 m, Telychian ( 423-4) <i><i>Chitinozoa</i> | Belonechitina aff. meifodensis Mullins et Loydell, 2001</i><br />Ventspils D-3 borehole, 827.60 m, Telychian ( 423-7) <i><i>Belonechitina</i> | Belonechitina cf. cavei Mullins et Loydell, 2001</i><br />Ventspils D-3 borehole, 830.00 m, Telychian ( 423-5) <i><i>Bursachitina nestorae</i></i><br />Ventspils D-3 borehole, 827.60 m, Telychian ( 423-12) <i><i>Bursachitina</i> | Bursachitina sp.</i><br />Ventspils D-3 borehole, 827.60 m, Telychian ( 423-8) <i><i>Chitinozoa</i> | Bursachitina sp. 1 Mullins et Loydell, 2001</i><br />Ventspils D-3 borehole, 815.00 m, Telychian ( 423-16) <i><i>Conochitina emmastensis</i></i><br />Ventspils D-3 borehole, 815.00 m, Telychian ( 423-17) <i><i>Conochitina leptosoma</i></i><br />Ventspils D-3 borehole, 825.60 m, Telychian ( 423-11) <i><i>Conochitina proboscifera</i></i><br />Ventspils D-3 borehole, 807.00 m, Telychian ( 423-18) <i><i>Conochitina</i> | Conochitina sp. 1 Mullins et Loydell, 2001</i><br />Ventspils D-3 borehole, 834.60 m, Telychian ( 423-2) <i><i>Chitinozoa</i> | Conochitina sp. 6  Nestor, 1994</i><br />Ventspils D-3 borehole, 827.60 m, Telychian ( 423-6) <i><i>Conochitina visbyensis</i></i><br />Ventspils D-3 borehole, 830.00 m, Telychian ( 423-3) <i><i>Eisenackitina causiata</i></i><br />Ventspils D-3 borehole, 827.60 m, Telychian ( 423-10) <i><i>Eisenackitina dolioliformis</i></i><br />Ventspils D-3 borehole, 815.00 m, Telychian ( 423-13) <i><i>Margachitina banwyensis</i></i><br />Ventspils D-3 borehole, 815.00 m, Telychian ( 423-19) <i><i>Margachitina margaritana</i></i><br />Ventspils D-3 borehole, 815.00 m, Telychian ( 423-14) <i><i>Plectochitina pachyderma</i></i><br />Ventspils D-3 borehole, 815.00 m, Telychian ( 423-9) <i><i>Ramochitina ruhnuensis</i></i><br />Ventspils D-3 borehole, 808.00 m, Telychian ( 423-20) <i><i>Rhabdochitina</i> | Rhabdochitina sp.</i><br />Ventspils D-3 borehole, 826.70 m, Telychian ( 423-1)