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LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

LOWER CRETACEOUS DEPOSITS CALIFORNIA AND OREGON

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324 lower cretaceous deposits itf california and oregon<br />

PLATE 71.—<strong>CRETACEOUS</strong> FOSSIL FOOU <strong>CALIFORNIA</strong><br />

Tropaeum pcrCMlaluirt (Gabb). Large example, showing change in ribbing and<br />

other features from youth to old age. Much reduced in size. Greatest diameter,<br />

17 inches (432 mm.). A little above the Argonaut sane, upper middle part of Horsetown<br />

Group; near Loc, 1347 (C, A. S.), cast of Mitchell Creek, Shasta County,<br />

p. 212.

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