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Sundberg F. A., McCollum L. B. (2000) Ptychoparid trilobites of the Lower-Middle
Cambrian boundary interval, Pioche Shale, southeastern Nevada, Journal of Paleontology, 604-630
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Sundberg F. A., McCollum L.B. (2003) Trilobites of the lower Middle
Cambrian Poliella denticulata biozone (new) of southeastern Nevada, Journal of Paleontology, 331-359
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Landing E., Johnson S. C., et al (2008) Faunas and
Cambrian volcanism on the Avalonian marginal platform, southern New Brunswick, Journal of Paleontology 82 5, 884-905
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225:See text
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