Middle Jurassic (Bajocian) Eastern Oregon
Middle Jurassic (Bajocian) Eastern Oregon
Middle Jurassic (Bajocian) Eastern Oregon
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PLATE 17<br />
[Figure is about four-fifths natural size]<br />
FJG UHJ·: 1. Sonninia (Euhoploceras) adicra (Waagen) (p. 65) .<br />
Moderately stout hypotypc, CAS 13387 from Lupher's loc. 228, upper<br />
part of Weberg Member of Snowshoe Formation. As slightly less than onefourth<br />
of the outer whorl is nonseptate, the complete adult shell must have<br />
had a diameter of at least 350 mm. This specimen is nearly identical in appearance<br />
with the large adult specimens of Sonninia marginala Buckman (1892,<br />
pis. 62 and 64).
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