J. Alroy. 2008. Dynamics of origination and extinction in the marine fossil record. Proceedings of the National Academy of Sciences, USA 105:11536-11542.

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Lake Huron Beach, north of Rockport Quarry ½ miles N Alpena:Presque Isle Co - Victoria West District (?Abrahamskraal Formation) - Kertsch - Voslau - Sakamaniga (Sakamena Fm.) - Alakir Cay Valley - Jiuqunao section, Yangtze Gorge - Bustingorry's farm