The writers thank H. M. Chung and S. W. Brand for providing aliquots of the Michigan basin samples. F. R. Haney and J. D. (Pruitt) Reed contributed in analyzing the oils, forming the ideas presented, and reviewing the manuscript.
We welcome the Nunn et al (1984) paper for the opportunity it presents to consider further the origin of oils in the Michigan basin. As one of their main conclusions, Nunn et al stated that oils present in the basin were probably derived from Silurian or older sediments. Indeed, Nunn et al expressed a strong preference for a source no younger...
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