A Physonemus Spine from the Lower Mercer Limestone (Pennsylvanian) of Portage County, Ohio
Creators:Murphy, James L., 1941-
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Citation:The Ohio Journal of Science. v71 n4 (July, 1971), 240-242
A small, relatively complete icthyodorulite from the Lower Mercer Limestone of the Pennsylvanian Pottsville Group (Kanawha-Lampasas Series and Westphalian B) has been found in eastern Portage County, Ohio. The spine is comparable to Physonemus acinaciformis (St. John and Worthen), P. striatus (Moore), and P. anceps (Newberry and Worthen), the first two of which may be synonyms.
Author Institution: Department of Geology, Case Western Reserve University
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