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Kalana Lagerstätte crinoids: Early Silurian (Llandovery) of central Estonia

Published online by Cambridge University Press:  14 May 2019

William I. Ausich
Department of Geological Sciences, 125 South Oval Mall, The Ohio State University, Columbus, Ohio 43210
Mark A. Wilson
Department of Earth Sciences, The College of Wooster, Wooster, Ohio 44691
Oive Tinn
Department of Geology, University of Tartu, Ravila 14 A, 50411 Tartu, Estonia


The Kalana Lagerstätte of early Aeronian (Llandovery, Silurian) age in central Estonia preserves a diverse shallow marine biota dominated by non-calcified algae. This soft-tissue flora and decalcified and calcified crinoids are preserved in situ, in a lens of microlaminated, dolomitized micrite interbedded in a sequence of dolomitized packstones and wackestones. Although the Lagerstätte is dominated by non-calcified algae, crinoids (together with brachiopods and gastropods) are among the most common organisms that were originally comprised of a carbonate skeleton. Two new crinoids are described from this unit, Kalanacrinus mastikae n. gen. n. sp. (large camerate) and Tartucrinus kalanaensis n. gen. n. sp. (small disparid). Interestingly, these two crinoids display contrasting preservation, with the more common large camerate preserved primarily as a decalcified organic residue, whereas the smaller disparid is preserved primarily in calcite. Preservation was assessed using elemental mapping of C, Ca, S, and Si. Columns have the highest portion of Ca, once living soft tissue is indicated by C, S was dispersed as pyrite or associated with organics, and Si is probably associated with clay minerals in the matrix. This new fauna increases our understanding of the crinoid radiation on Baltica following Late Ordovician extinctions.


Copyright © 2019, The Paleontological Society 

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