G. A. Tarrant

Upper Ordovician conodont biostratigraphy and the age of the Collingwood Member, southern Ontario, Canada1Earth Science Sector (ESS) Contribution 20100302.

C. Barnes, Shunxin Zhang, G. A. Tarrant, 2011 .

The structure and evolution of Ordovician conodont apparatuses

C. Barnes, G. Nowlan, A. Mccracken, 1979 .

Upper Ordovician conodont biostratigraphy and the age of the Collingwood Member, southern Ontario, Canada11Earth Science Sector (ESS) Contribution 20100302.

Jisuo Jin, Shunxin Zhang, G. A. Tarrant, 2011 .