Middle Jurassic (Bajocian) Eastern Oregon
Middle Jurassic (Bajocian) Eastern Oregon
Middle Jurassic (Bajocian) Eastern Oregon
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[Figure reduced to three-fourths natural size]<br />
FIGURB 1. Sonninia (Euhoploceras) polyacanlha (Waagcn) (p. 64).<br />
Hypotype CAS 13385 from Lupher's loc. 573. Same specimen shown on<br />
plate 18. The outermost whorl is nonseptate and presumably represents<br />
part of the body chamber.