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Journal Article

Emended Sandbian (Ordovician) conodont biostratigraphy in Baltoscandia and a new species of Amorphognathus Open Access

Tõnn Paiste, Peep Männik, Tõnu Meidla
Published: 24 October 2022
Geological Magazine (2023) 160 (3): 411–427.
DOI: https://doi.org/10.1017/S0016756822001005
... ; Viira, 2008 ; Xu et al. 2010 ; Paiste et al. 2022 ) but have not drawn any conclusions, probably because of a lack of representative material for such a study. In the present study, which is based on a rich collection of conodonts from the Mehikoorma drillcore section from Estonia...
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Journal Article

The middle Darriwilian (Ordovician) δ 13 C excursion (MDICE) discovered in the Yangtze Platform succession in China: implications of its first recorded occurrences outside Baltoscandia Available to Purchase

Birger Schmitz, Stig M. Bergström, Wang Xiaofeng
Published: 01 March 2010
Journal of the Geological Society (2010) 167 (2): 249–259.
DOI: https://doi.org/10.1144/0016-76492009-080
... the baseline values in slightly older and younger stratigraphic intervals. Martma (2005 ) described the MDICE in the Mehikoorma drill-core from southeastern Estonia and noted that it not only is present in the Aseri Stage but also extends into the Lasnamägi Stage. In a useful review of δ 13 C...
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Stratigraphic chart illustrating the range of Amorphognathus aff. Am. ventilatus in relation to the GICE in the Puxihe section and the Mehikoorma (421) drill core, Estonia. The Estonian biostratigraphy and chemostratigraphy are based on Männik & Viira (2005) and Martma (2005), respectively. Note the close similarity in the first appearance datum (FAD) of this conodont species between the two sections. For explanation of lithological patterns in the stratigraphic columns, see Figure 4. The pattern in the 286.4–298.5 m interval in the Estonian drill-core denotes dolomitic marl with lenses and interbeds of carbonate.

Stratigraphic chart illustrating the range of Amorphognathus aff. Am. ve... Available to Purchase

Published: 05 November 2008
Figure 5. Stratigraphic chart illustrating the range of Amorphognathus aff. Am. ventilatus in relation to the GICE in the Puxihe section and the Mehikoorma (421) drill core, Estonia. The Estonian biostratigraphy and chemostratigraphy are based on Männik & Viira (2005) and Martma
Journal Article

First documentation of the Ordovician Guttenberg δ 13 C excursion (GICE) in Asia: chemostratigraphy of the Pagoda and Yanwashan formations in southeastern China Available to Purchase

STIG M. BERGSTRÖM, CHEN XU, BIRGER SCHMITZ, SETH YOUNG, RONG JIA-YU, MATTHEW R. SALTZMAN
Published: 05 November 2008
Geological Magazine (2009) 146 (1): 1–11.
DOI: https://doi.org/10.1017/S0016756808005748
...Figure 5. Stratigraphic chart illustrating the range of Amorphognathus aff. Am. ventilatus in relation to the GICE in the Puxihe section and the Mehikoorma (421) drill core, Estonia. The Estonian biostratigraphy and chemostratigraphy are based on Männik & Viira (2005) and Martma...
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View PDF for article title, First documentation of the Ordovician Guttenberg δ 13 C excursion (GICE) in Asia: chemostratigraphy of the Pagoda and Yanwashan formations in southeastern China
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Figure 11.

Comparison of the δ 13 C records from the Tingskullen core (this study), ... Available to Purchase

Published: 22 February 2016
Figure 11. Comparison of the δ 13 C records from the Tingskullen core (this study), Hällekis quarry of southern Sweden (Schmitz, Bergström & Wang, 2010 ), Mora 001 and Solberga 1 cores from the Siljan area of central Sweden (Lehnert et al. 2014 ), Mehikoorma
Image
The δ13C curve through the Darriwilian succession in the Mehikoorma (421) drill-core in southeastern Estonia (after Martma 2005). Conodont biostratigraphy is after Männik & Viira (2005). Apparently because of the paucity of index conodonts in the lower Baldone Formation, the Lenodus variabilis and Eoplacognathus crassus zones have not yet been recognized. The marked increase in δ13C values in the Microzarkodina ozarkodella Subzone that indicates the beginning of the MDICE should be noted. Baseline δ13C values do not return until near the end of the Darriwilian Stage (Martma 2005), which is above the 20 m level in the diagram. It should be noted also that the 0 m level in the diagram corresponds to a drill-core depth of 361.1 m and that most of the succession, although shown as limestone, has undergone diagenesis to dolostone. (For lithological patterns used in the stratigraphic columns in Figs 3,4,5,6, see Fig. 6.)

The δ 13 C curve through the Darriwilian succession in the Mehikoorma (421)... Available to Purchase

Published: 01 March 2010
Fig. 3. The δ 13 C curve through the Darriwilian succession in the Mehikoorma (421) drill-core in southeastern Estonia (after Martma 2005 ). Conodont biostratigraphy is after Männik & Viira (2005 ). Apparently because of the paucity of index conodonts in the lower Baldone Formation
Journal Article

Recognizing Tide-Dominated Versus Tide-Influenced Deltas: Middle Devonian Strata of the Baltic Basin Available to Purchase

Kati Tänavsuu-Milkeviciene, Piret Plink-Björklund
Published: 01 December 2009
Journal of Sedimentary Research (2009) 79 (12): 887–905.
DOI: https://doi.org/10.2110/jsr.2009.096
... deposited in a shallow marine setting ( Kleesment 1997 ; Paškevičius 1997 ). The main part of the deltaic succession, the Aruküla Formation of Estonia and Latvia, which is correlative with the Kukliai Formation in Lithuania ( Fig. 1 ), is interpreted to have been deposited in a shallow marine...
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Journal Article

The Ordovician zone index conodont Amorphognathus ordovicicus Branson & Mehl, 1933 from its type locality and the evolution of the genus Amorphognathus Branson & Mehl, 1933 Available to Purchase

STIG M. BERGSTRÖM, STEPHEN A. LESLIE
Published: 01 April 2010
Journal of Micropalaeontology (2010) 29 (1): 73–80.
DOI: https://doi.org/10.1144/jm.29.1.73
... . Distribution of Ordovician conodonts . In : Põldvere , A. (Ed.), Estonian Geological Sections, Mehikoorma (421) drill core . Geological Survey of Estonia Bulletin, 6 : 16 – 20 . Merrill , G.K. 1980 . Ordovician conodonts from the Åland Islands, Finland . Geologiska Föreningens i Stockholm...
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View PDF for article title, The Ordovician zone index conodont Amorphognathus ordovicicus Branson & Mehl, 1933 from its type locality and the evolution of the genus Amorphognathus Branson & Mehl, 1933
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Journal Article

A modern assessment of Ordovician chitinozoans from the Shelve and Caradoc areas, Shropshire, and their significance for correlation Available to Purchase

THIJS R. A. VANDENBROUCKE, ANTONIO ANCILLETTA, RICHARD A. FORTEY, JACQUES VERNIERS
Published: 28 November 2008
Geological Magazine (2009) 146 (2): 216–236.
DOI: https://doi.org/10.1017/S0016756808005815
... J. 2005 . Distribution of Ordovician Chitinozoans. In Estonian Geological Sections, Bulletin 6, Mehikoorma (421) core (ed. Poldvere A. ), pp. 20 –2. Geological Journal of the Geological Survey of Estonia , Tallinn . Nõlvak J. & Grahn I. 1993...
View PDF for article title, A modern assessment of Ordovician chitinozoans from the Shelve and Caradoc areas, Shropshire, and their significance for correlation
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Journal Article

Integrated conodont biostratigraphy and carbon isotope chemostratigraphy in the Lower–Middle Ordovician of southern Sweden reveals a complete record of the MDICE Available to Purchase

RONGCHANG WU, MIKAEL CALNER, OLIVER LEHNERT
Published: 22 February 2016
Geological Magazine (2017) 154 (2): 334–353.
DOI: https://doi.org/10.1017/S0016756816000017
...Figure 11. Comparison of the δ 13 C records from the Tingskullen core (this study), Hällekis quarry of southern Sweden (Schmitz, Bergström & Wang, 2010 ), Mora 001 and Solberga 1 cores from the Siljan area of central Sweden (Lehnert et al. 2014 ), Mehikoorma...
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View PDF for article title, Integrated conodont biostratigraphy and carbon isotope chemostratigraphy in the Lower–Middle Ordovician of southern Sweden reveals a complete record of the MDICE
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Journal Article

Integrated Upper Ordovician graptolite–chitinozoan biostratigraphy of the Cardigan and Whitland areas, southwest Wales Available to Purchase

THIJS R. A. VANDENBROUCKE, MARK WILLIAMS, JAN A. ZALASIEWICZ, JEREMY R. DAVIES, RICHARD A. WATERS
Published: 01 March 2008
Geological Magazine (2008) 145 (2): 199–214.
DOI: https://doi.org/10.1017/S0016756807004232
... Sections, Bulletin 6, Mehikoorma (421) core (ed. A. Poldvere ), pp. 20 – 2 . Geological Journal of the Geological Survey of Estonia . Tallinn . Nolvak , J. & Grahn , I. 1993 . Ordovician chitinozoan zones from Baltoscandia . Review of Palaeobotany and Palynology 79 , 245...
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Book Chapter

Ordovician of the Eastern Baltic palaeobasin and the Tornquist Sea margin of Baltica Open Access

Author(s)
Tõnu Meidla, Leho Ainsaar, Olle Hints, Sigitas Radzevičius
Book: A Global Synthesis of the Ordovician System: Part 1
Series: Geological Society, London, Special Publications
Publisher: Geological Society of London
Published: 10 May 2023
DOI: 10.1144/SP532-2022-141
EISBN: 9781786209641
... a ) are presented in Figure 2 , together with phosphate δ 18 O three-point averaged curves from the Mehikoorma and Valga drillcores (Estonia; Männik et al. 2021 ). The curves have been tentatively positioned on a palaeotemperature scale (calculated on the basis of seawater δ 18 O = −1). The gradual cooling...
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Abstract
View PDF for content titled, Ordovician of the Eastern Baltic palaeobasin and the Tornquist Sea margin of Baltica
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Abstract This paper summarizes recent knowledge on the palaeontology, biostratigraphy, correlation, sea-level and climate history and isotopic geochemistry of the Ordovician rocks in the western and central parts of the East European Craton, in the area extending from the southern margin of the Fennoscandian Shield to the western margin of the Ukrainian Shield. The regional chronostratigraphic standard is briefly summarized and its correlation to the global standard of the Ordovician is addressed. A two-part correlation chart of 10 areas with unique local Ordovician successions is aligned with the most recent international correlation standard of the Ordovician System and presented against the regular timescale. An updated summary of the evolution of the marine assemblages is provided, the principal gaps in the existing extremely rich palaeontological database are identified and the main bioevents are discussed.

Journal Article

Upper Ordovician chitinozoan biostratigraphy from the type Ashgill area (Cautley district) and the Pus Gill section (Dufton district, Cross Fell Inlier), Cumbria, Northern England Available to Purchase

THIJS R. A. VANDENBROUCKE, BARRIE RICKARDS, JACQUES VERNIERS
Published: 01 November 2005
Geological Magazine (2005) 142 (6): 783–807.
DOI: https://doi.org/10.1017/S0016756805000944
..., Bulletin 6, Mehikoorma (421) core (ed. A. Poldvere ). Geological Journal of the Geological Survey of Estonia , Tallinn . Nolvak , J. & Grahn , I. 1993 . Ordovician chitinozoan zones from Baltoscandia . Review of Palaeobotany and Palynology 79 , 245 – 69 . Orchard...
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