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Fig. 2 | Swiss Journal of Palaeontology

Fig. 2

From: A noteworthy accumulation of disparid crinoids from the type Cincinnatian (Upper Ordovician) of southwestern Ohio, USA: implications for the palaeoecology and taphonomy of crinoid “logjam” assemblages

Fig. 2

An Iocrinus subcrassus “logjam” from the Kope Formation (CMC IP79901). a View of upper surface of graded siltstone bed showing aligned, slightly curved I. subcrassus stems. Scale bar = 10 mm. b View of lower surface of bed, showing basal skeletal hash, representing the base of the graded bed, overlain by aligned I. subcrassus stems. The areas enlarged in panels C and D of this figure are indicated. Note that the image has been rotated to maintain the same outline shown in panel A. Scale bar = 10 mm. c Coiled I. subcrassus dististele wrapped tightly around one of the stems visible in panel B. Note that coiled dististeles have not previously been described from crinoid “logjam” assemblages, and that I. subcrassus is not known to wrap around other stems. Scale bar = 5 mm. d Possible coiled I. subcrassus dististele wrapped around one of the stems visible in panel B. This is somewhat loosely coiled, so it may represent a coincidental relationship rather than true attachment. Scale bar = 5 mm

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