Data from: Kalana Lagerstatte crinoids: early Silurian (Llandovery) of central 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
(large camerate) and Tartucrinus kalanaensis (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.