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Loydell et al., 2003

Loydell, D. K., Männik, P., Nestor, V. 2003. Integrated biostratigraphy of the lower Silurian of the Aizpute-41 core, Latvia. Geological Magazine 140 (2), 205-229. | DOI | DETAILS

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ID584
ReferenceLoydell et al., 2003
AuthorLoydell, D. K., Männik, P., Nestor, V.
Year2003
TitleIntegrated biostratigraphy of the lower Silurian of the Aizpute-41 core, Latvia
JournalGeological Magazine
Volume140
Number2
pgs.205-229
Source typearticle in journal
LanguageEnglish
DOI10.1017/S0016756802007264
Abstract

Integrated graptolite, conodont and chitinozoan biostratigraphical data is presented from the Rhuddanian through to lower Sheinwoodian of the Aizpute-41 core, Latvia. Correlation of the biozonation schemes based upon the three groups is achieved from the cyphus through to lowermost riccartonensis graptolite biozones, except for the upper Aeronian and lower Telychian, which lack both chitinozoans and graptolites, and upper lapworthi through to approximately base murchisoni graptolite Biozone, where there is interpreted to be an unconformity. Datum 2 of the Ireviken Event is correlated with a level at the base of or within the murchisoni Biozone. It is possible that the changes in conodont assemblages at Datum 2 on Gotland are the result of an unconformity here. Streptograptus? kaljoi sp. nov., from the lower spiralis graptolite Biozone, is described.


Sections studied or mentioned

Localitypgs.Figs.Remarks
Aizpute 41 borehole205-229sellest puuraugust artikkel

Photos

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<i><i>Chitinozoa</i> | "Vitreachitina" sp. 2 , Nestor, 1994</i><br />Aizpute 41 borehole, 964.60 m, lower Silurian (345-19) <i><i>Chitinozoa</i> | Ancyrochitina aff. ancyrea (Eisenack, 1931)</i><br />Aizpute 41 borehole, 946.55 m, lower Silurian (345-26) <i><i>Ancyrochitina convexa</i> | Ancyrochitina convexa? Nestor, 1980</i><br />Aizpute 41 borehole, 974.80 m, lower Silurian (345-10) <i><i>Angochitina longicollis</i></i><br />Aizpute 41 borehole, 949.85 m, lower Silurian (345-24) <i><i>Belonechitina aspera</i></i><br />Aizpute 41 borehole, 977.95 m, lower Silurian (345-15) <i><i>Belonechitina postrobusta</i></i><br />Aizpute 41 borehole, 977.95 m, lower Silurian (345-1) <i><i>Bursachitina nana</i></i><br />Aizpute 41 borehole, 926.00 m, lower Silurian (345-34) <i><i>Bursachitina</i> | Bursachitina sp.</i><br />Aizpute 41 borehole, 971.15 m, lower Silurian (345-14) <i><i>Conochitina</i> | Conochitina aff. flamma Laufeld, 1974</i><br />Aizpute 41 borehole, 912.45 m, lower Silurian (345-32) <i><i>Chitinozoa</i> | Conochitina aff. tuba Eisenack, 1932</i><br />Aizpute 41 borehole, 974.15 m, lower Silurian (345-11) <i><i>Conochitina alargada</i></i><br />Aizpute 41 borehole, 972.40 m, lower Silurian (345-17) <i><i>Chitinozoa</i> | Conochitina cf. malleus nomen nudum van Grootel 1990</i><br />Aizpute 41 borehole, 972.40 m, lower Silurian (345-12) <i><i>Conochitina edjelensis</i></i><br />Aizpute 41 borehole, 971.15 m, lower Silurian (345-13) <i><i>Conochitina emmastensis</i></i><br />Aizpute 41 borehole, 948.10 m, lower Silurian (345-22) <i><i>Conochitina iklaensis</i></i><br />Aizpute 41 borehole, 972.40 m, lower Silurian (345-16) <i><i>Conochitina leptosoma</i></i><br />Aizpute 41 borehole, 964.60 m, lower Silurian (345-7) <i><i>Conochitina praeproboscifera</i></i><br />Aizpute 41 borehole, 949.00 m, lower Silurian (345-25) <i><i>Conochitina proboscifera</i></i><br />Aizpute 41 borehole, 942.90 m, lower Silurian (345-28) <i><i>Chitinozoa</i> | Conochitina sp. 6 Nestor, 1994</i><br />Aizpute 41 borehole, 960.95 m, lower Silurian (345-21) <i><i>Conochitina visbyensis</i></i><br />Aizpute 41 borehole, 964.60 m, lower Silurian (345-20) <i><i>Cyathochitina campanulaeformis</i></i><br />Aizpute 41 borehole, 982.60 m, lower Silurian (345-2) <i><i>Chitinozoa</i> | Cyathochitina cf. kuckersiana (Eisenack, 1934)</i><br />Aizpute 41 borehole, 977.95 m, lower Silurian (345-3) <i><i>Eisenackitina causiata</i></i><br />Aizpute 41 borehole, 937.50 m, lower Silurian (345-23) <i><i>Eisenackitina dolioliformis</i></i><br />Aizpute 41 borehole, 961.90 m, lower Silurian (345-18) <i><i>Euconochitina electa</i></i><br />Aizpute 41 borehole, 975.45 m, lower Silurian (345-5) <i><i>Margachitina margaritana</i></i><br />Aizpute 41 borehole, 929.50 m, lower Silurian (345-30) <i><i>Plectochitina</i> | Plectochitina cf. pachyderma Laufeld, 1974</i><br />Aizpute 41 borehole, 928.00 m, lower Silurian (345-31) <i><i>Chitinozoa</i> | Plectochitina cf. spongiosa (Achab, 1977)</i><br />Aizpute 41 borehole, 982.60 m, lower Silurian (345-8) <i><i>Ramochitina angusta</i></i><br />Aizpute 41 borehole, 943.95 m, lower Silurian (345-27) <i><i>Ramochitina ruhnuensis</i></i><br />Aizpute 41 borehole, 937.50 m, lower Silurian (345-29) <i><i>Ramochitina</i> | Ramochitina sp.</i><br />Aizpute 41 borehole, 910.50 m, lower Silurian (345-33) <i><i>Rhabdochitina</i> | Rhabdochitina sp.</i><br />Aizpute 41 borehole, 976.45 m, Silurian (345-6) <i><i>Sphaerochitina</i> | Sphaerochitina sp.</i><br />Aizpute 41 borehole, 974.65 m, lower Silurian (345-9) <i><i>Spinachitina</i> | Spinachitina sp.</i><br />Aizpute 41 borehole, 977.00 m, lower Silurian (345-4)