ORDOVICIAN
southern Idaho and northern Utah - see also the Garden City Formation
Trilobites:
Swan Peak Formation (Zone M):
Eleutherocentrus petersoni Clark (Swan Peak Fm.)
"Symphysurus?" goldfussi Walcott, 1884
REFERENCES:
Ross, R. J. Jr. (1951) Stratigraphy of the Garden City Formation in northeastern Utah, and its trilobite faunas. Peabody Museum of Natural History, Yale University, Bulletin 6, 161 pp., 36 pls.
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