Pickerill, Ronald K. and Forbes, W. H. 1978. A trace fossil preserving its producer (Trentonia shegiriana) from the Trenton Limestone of the Quebec City area. Canadian Journal of Earth Sciences, 15(4): 659-664.
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Pickerill, R. K.; Forbes, W. H.
1978
A trace fossil preserving its producer (Trentonia shegiriana) from the Trenton Limestone of the Quebec City area