Colonial horn coral (Hexagonaria sp.)
Bob Campbell Geology Museum 325 million years old; Formation: Salem & Warsaw Formation.
Coral 'Petosky Stone' (Hexagonaria percarinata), state stone of Michigan
Bob Campbell Geology Museum 350 million years old; Donated: H. Abercrombie.
Streptelasma sp., three incomplete corals, elongated, narrow and sharply tapering
Bob Campbell Geology Museum Formation: Whitewood Formation.
Favosites canadensis, massive colony with long, narrow, closely packed corallites
Bob Campbell Geology Museum Formation: Onandaga Limestone; Nedrow mem.