349 Stromatoporoids from the Emsian (Lower Devonian) of Artic Canada

Stromatoporoids from the Emsian (Lower Devonian) of Artic Canada - BAP #349     Early Devonian limestones of Ellesmere, Bathurst, and smaller islands between them in the Canadian Arctic Archipelago contain a diverse fauna of stromatoporoid sponges. This fauna provides the best evidence in North America of the early recovery phase of this reef-building group from a diversity low at the Silurian/Devonian boundary, a recovery that lead to its diversity peak in Givetian time. Stromatoporoids from the lower member of the Blue Fjord Formation locally form large reefal masses. Well preserved stromatoporoids also occur less abundantly: 1. in the top of the underlying Eids Formation, 2. in the upper member of the Blue Fjord Formation, 3. in the Disappointment Bay Formation, which is correlative of the upper Blue Fjord, and, 4. in the overlying Bird Fjord Formation, and a correlative unnamed formation, both of which span the Lower/Middle Devonian boundary. The stratigraphic distribution of thes