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Donovan, S.K. 1989. Pelmatozoan columnals from the Ordovician of the British Isles. Part 2. Monograph of the Palaeontographical Society London: pp. 69-114, pls 7-13. (Issue 580, part of Volume 142)
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| Title: | Pelmatozoan columnals from the Ordovician of the British Isles. |
| Author(s): | Donovan, S.K. |
| Issue: | 580 |
| Volume: | 142 |
| Part: | 2 |
| Year: | 1989 |
| Pagination: | pp. 69-114, pls 7-13. |
| Bound Volume? | No |
Abstract:
| In part 2, 8 genera (3 new) and 9 species (5 new) of crinoid, and 10 morphogenera (7 new) and 33 morphospecies (all new) of pelmatozoan columnal are described. Columnals with 2-, 3-, 4- and 6-fold symmetry form a distinctive component of the Ordovician fauna of the British Isles but are common only locally. Columnals with cyclic symmetry are particularly common, and range from Arenig to Ashgill. |
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