A well-preserved fauna from the Middle Ordovician Wilderness Stage near Braeside, Ontario, consists of seven species of palecypods, thirteen gastropods, one hyolithid, eight cephalopods, eight brachiopods, eight corals, six trilobites, two crinoids, one
edrioasteroid, one stellaroid, nineteen ostracodes, and eight genera of bryozoans. Fine silification of the molluscs and brachiopods has resulted in the preservation of delicate internal and external features. Most corals and some bryozoans are coarsely silicified and poorly preserved. The
trilobites, echinoderms and ostracods are delicately preserved but unsilicified. Specimens are sufficiently common to permit assessment of morphological variations in several species; many previously erected species from the Ottawa Valley appear conspecific. Six new species are
described.
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