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Kaljo et al., 2015

ID4488
ReferenceKaljo et al., 2015
AuthorKaljo, D., Einasto, R., Martma, T., Märss, T., Nestor, V. & Viira, V.
Year2015
TitleA bio-chemostratigraphical test of the synchroneity of biozones in the upper Silurian of Estonia and Latvia with some implications for practical stratigraphy
JournalEstonian Journal of Earth Sciences
Volume64
Number4
pgs.267-283
Source typearticle in journal
LanguageEnglish
DOI10.3176/earth.2015.33
AbstractThe paper discusses the reliability of different biozones in terms of their synchroneity when crossing facies boundaries within a sedimentary basin. Graptolite biozones are the most trusted ones, but also biozones based on conodonts, chitinozoans and less ‘authoritative’ groups like ostracodes and vertebrates are used. The integration of bio- and chemostratigraphy aids the understanding of the pattern and timing of fossil distribution. Despite different environments most of the analysed biozones are in general synchronous units and in the majority of cases their time signals do not contradict each other. The much discussed Ozarkodina crispa (and its two morphs) has a stratigraphical range in the East Baltic that is longer than commonly recognized elsewhere. Its first occurrences in Estonia have been reported from shallow-water facies below the Mid-Ludfordian Carbon Isotope Excursion. The geographical distribution of Oz. crispa is much wider in the upper Ludfordian open shelf rocks and a few occurrences are also known in the lowest Přídolí in the East Baltic. Analogous ecostratigra phical trends are characteristic of some other fossil species. The analysis demonstrates that, when properly studied, all of the fossil groups considered can provide useful biostratigraphical information. The subdivision of the Přídolí Series into two stages is discussed. Bio-chemostratigraphical data confirm the late Ludfordian age of the Kuressaare Formation and its correlatives. The bio- and chemostratigraphical testing of biozonal indices suggests some tentative correlations with other areas, in particular the type Ludlow area, and enables identification of the Silurian–Devonian boundary in the East Baltic.
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Supplements (with DOI)

DOIAuthorDateTitleFormat
10.15152/GEO.14Kaljo, D.; Martma, T.2015Whole-rock carbon isotope data from the Pavilosta (Kurzeme, Latvia) drill core. Supplementary data table 1text/plain; application/xlsx66 data points

Linked files

IDTypeDescriptionLink
1529data filedoi:10.15152/GEO.14. Whole-rock carbon isotope data from the Pavilosta (Kurzeme, Latvia) drill core. Supplementary data table 1 (in xlsx format)LINK
1530data filedoi:10.15152/GEO.14. Whole-rock carbon isotope data from the Pavilosta (Kurzeme, Latvia) drill core. Supplementary data table 1 (in tab-delimited text format)LINK

Sections described

Localitypgs.Figs.Remarks
Kolka 54 puuraukLate Silurian biostratigraphy (158-286 m)
Ohesaare puuraukLate Silurian biostratigraphy and delta13C curve (0-124 m)
Pavilosta 51 puuraukLate Silurian biostratigraphy and delta13C curve (489-900 m)
Ventspils D-3 puuraukLate Silurian biostratigraphy and delta13C curve (270-662 m)