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Loydell et al., 2003

Loydell, D., 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., 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
AbstractIntegrated 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
Aispute 41 borehole205-229sellest puuraugust artikkel

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