Chemical correlation of K-bentonite beds in the Middle Ordovician Decorah Subgroup, upper Mississippi Valley

Crinoids of the Champlainian (Middle Ordovician) Guttenberg Formation; upper Mississippi Valley region

Anomalocystitid mitrates (Stylophora-Echinodermata) from the Champlainian (Middle Ordovician) Guttenberg Formation of the Upper Mississippi Valley region

Franconian (Late Cambrian) to Early Champlainian (Middle Ordovician) conodonts from the Cow Head Group, western Newfoundland

Burrows at certain omission surfaces in the Middle Ordovician of the Upper Mississippi Valley

CORRELATION OF THE CANADIAN/CHAMPLAINIAN SERIES BOUNDARY AND THE WHITEROCK STAGE OF NORTH AMERICA WITH WESTERN EUROPEAN CONODONT AND GRAPTOLITE ZONES

The American Upper Ordovician Standard: XIII A Revised Time-Stratigraphic Classification of North American Upper Middle and Upper Ordovician Rocks

Distribution, paleoecology and correlation of Champlainian Ectoprocta (Bryozoa), New York state, part III

Champlainian (Ordovician) Ectoprocta (Bryozoa), New York state, part II

Champlainian Ectoprocta (Bryozoa), New York State