Kimmeridgian carbonate facies from the southern margin of the Łódź Depression are rich in crinoid remains, dominated by stalked forms. Free-living comatulids (adult stemless crinoids), however, have remained largely undocumented in this area, with only a single specimen reported to date. Our newly collected material includes several dozen comatulid remains, primarily represented by centrodorsals. These specimens are assigned to Solanocrinites sp., Comatulina sp., Palaeocomaster cf. karsensis Radwańska, and Semiometra petitclerci (Caillet). In addition, stalked comatulids belonging to the family Thiolliericrinidae are documented, including Thiolliericrinus flexuosus Goldfuss and Solonaerium cf. sigillatum (Quenstedt), the latter two species being reported from Poland for the first time. This study also provides a review of the Kimmeridgian stalked crinoids (Isocrinida, Millericrinida, Cyrtocrinida) and Upper Jurassic comatulids previously recorded from Poland. The new occurrences originate from lower Kimmeridgian sponge-bivalve-oncoid biostromal limestones and marly limestones, as well as from thin-bedded marls and marly limestones. Within the epicontinental platform of the northern Tethyan shelf, these facies represent mid- to outer-platform transgressive successions. Their development was particularly pronounced during the late Oxfordian to early Kimmeridgian (up to the Hypselocyclum Zone) limestone-dominated platform stage and continued into the marl-dominated platform stage of the early Kimmeridgian (Hypselocyclum-Divisum zones).
