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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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A single elongage and structurally advanced specimen of the rare and problematical supposedly tabulate coral genus Palaeacis Haime, 1857, in Milne-Edwards, 1860, emended Conkin, Bratcher, and Conkin, 1976, was collected in 1980 by H. J. Negrich (submitted by M. Wilson) from the Kananaskis Valley, Alberta, in beds high in the Mississippian Rundle Group.
The taxonomic status of Palaeacis is problematical, as it lacks septa and tabulae, and has a porous sponge-like wall rarely found in coelenterates, although the alternating biserial arrangement of 18 calyces appears coral-like. The origin of interwoven submicroscopic fibers lining the calyces is unknown. The recorded species, P. bifida (Kinderhookian and Osage), P. cavernosa, P. obtusa (Osage), P. cuneiformis (Meramecian), P. carinata (Chesterian). P. walcotti, P. testata, and P. kingi (Pennsylvanian), may demonstrate restricted stratigraphic ranges, although symbiotic and sedimentological controls may also be involved, Palaeacis has been recorded from the Carboniferous of the British Isles, Morocco, Soviet Union, United States, Australia, and from the Permian of Timor.
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