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Additional resources for Benthic macroinvertebrate associations from the Boreal Upper Jurassic of Milne Land, central East Greenland

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T h e r e are six species in the trophic nucleus (G. , T. aff. T. molarium, Entolium orbiculare, G. schourovskii and Pleuromya tri­ angularis). Although Turritella occupies only third rank, this rank of the gastropod, which is absent or very rare in other collections, is regarded as very significant. Epifauna ( 4 0 . g. Taimyrothyris, 'Rhynchonella' sp. , G. schourovskii, Ento­ lium, Buchia mosquensis), semi-infauna ( 3 3 . g. G. keyserlingii, Isognomon) and infauna ( 2 5 . g. Turritella, PI. triangularis, Astarte aff.

Fragmentation varies considerably and may be less than 10 or u p to 9 5 % . A s the biostratinomic history and lateral variation of the Pinna bed will be discussed in de­ tail later on, it is sufficient here to state that lateral transport and sorting of the fauna has not taken place and that the fauna accumulated in situ. The considerable thickness of most beds which contain the association suggests that the /. birke­ lundi/P. lanceolata association is the time-averaged relic of a community which per­ sisted for thousands of years.

All these features point to a sea floor which was patchily colonized by brachiopods. Considering that the overwhelming majority of the fauna lived epifaunally, the to­ tal lack of encrusting or boring faunal elements is surprising. ru/ 45 Table 16. 4%) "Taimyrothyris sp. nov. 1%) Serpula intestinalis Trace fossils Planolites sp. Macaronichnus segregatis mantled vertical tubes sp. nov. 1 25 25 25 25 4 collections, 713 specimens. Members of the trophic nucleus are marked with an asterisk. 37). 7).

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