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  Estonian Journal of Earth Sciences

ISSN 1736-7557 (electronic)  ISSN 1736-4728 (print)
An international scientific journal

Formerly: Proceedings of the Estonian Academy of Sciences, Geology
Published since 1952

Estonian Journal of Earth Sciences

ISSN 1736-7557 (electronic)  ISSN 1736-4728 (print)
An international scientific journal

Formerly: Proceedings of the Estonian Academy of Sciences, Geology
Published since 1952

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The earliest cornulitid on the internal surface of the illaenid pygidium from the Middle Ordovician of Estonia; pp. 193–197

(Full article in PDF format) https://doi.org/10.3176/earth.2017.19


Authors

Olev Vinn, Ursula Toom, Mare Isakar

Abstract

The earliest cornulitid Cornulites sp. appears in the Darriwilian (Lasnamägi Regional Stage) of Estonia. Internal annulation is present in all Middle Ordovician cornulitids and could be a plesiomorphic character for the group. The encrusted trilobites are rare in the Ordovician of Estonia. Illaenid pygidia and cranidia were encrusted by cornulitids and trepostome bryozoans. The encrustation of both Middle Ordovician and Late Ordovician trilobites took place post mortem. The studied hard substrate communities of Middle Ordovician and Late Ordovician trilobite pygidia and cranidia are typical of the Ordovician.

Keywords

trilobites, encrustation, tentaculitoids, cornulitids, Ordovician, Baltica.

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Current Issue: Vol. 67, Issue 2 in Press, 2018




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