Abstract

Early and early Middle Ordovician chitinozoans from the Baldone drill core, central Latvia

Highlights

  • Chitinozoans are a common group of organic-walled marine microfossils in Ordovician to Devonian rocks (Eisenack 1931; Paris et al 1999; Servais et al 2013)

  • And early Middle Ordovician chitinozoans are relatively poorly known in Baltoscandia, the understanding of the early diversification of the group, as well as its biostratigraphic utility, is limited

  • We document the distribution of chitinozoans in the Floian and lower Darriwilian strata of the Baldone drill core from central Latvia, a region from where very limited data on chitinozoans have hitherto been available

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Summary

Introduction

Chitinozoans are a common group of organic-walled marine microfossils in Ordovician to Devonian rocks (Eisenack 1931; Paris et al 1999; Servais et al 2013). In the Baltic region, Ordovician chitinozoans have been studied in the pioneering works of Alfred Eisenack since the 1930s (see Eisenack 1976 for references) and by many subsequent authors (e.g. Laufeld 1967; Obut 1973; Grahn 1980, 1982a, 1982b; Nõlvak 1980, 2010; Wrona 1980; Schallreuter 1981; Obut 1995; Tammekänd et al 2010; Grahn & Paris 2011; Hints et al 2011, 2018; Nõlvak et al 2019; Liang et al 2022). These studies have resulted in some of the largest collections and distributional data sets worldwide. This knowledge gap is partly due to a preservation bias – chitinozoans are not present in red-coloured (oxidized) rocks, and in dolomitized or siliciclastic successions their occurrences are scattered and finds of rich assemblages are rare

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