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Loydell et al., 2010

Integrated biostratigraphy of the lower Silurian of the Kolka-54 core, Latvia

Loydell, D. K., Nestor, V., Männik, P.
DOI
DOI10.1017/S0016756809990574
Year2010
JournalGeological Magazine
Volume147
Number2
Pages253-280
Typearticle in journal
Figures17
Estonian author
LanguageEnglish
Id1377

Abstract

Integrated graptolite, conodont and chitinozoan biostratigraphical data are presented from the Llandovery and Wenlock of the Kolka-54 core, Latvia. Correlations between graptolite and chitinozoan biozones are consistent with those published from other East Baltic sections and the Welsh Basin. While most correlations between graptolite and conodont biozones agree with those presented in previous studies, there are important exceptions. Significantly, we report here the discovery of Distomodus staurognathoides Biozone conodonts in the lowest Aeronian Demirastrites triangulatus graptolite Biozone. The base of the D. staurognathoides Biozone was previously considered to lie much higher in the Aeronian. Also it is shown that Walliserodus survived the late Wenlock Mulde Event, during which it was considered previously to have become extinct.

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