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GEOLOGICAL SURVEY

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BOYLE.] NORTH AMERICAN MESOZOIC INVERTEBRATA. 57<br />

Avicula Continued.<br />

cretacea n. s. Conrad. (1843.)<br />

Rep. Hydrog. Basin upper Mississippi river, I. N.<br />

Nicollet. App. C,p. 170. Wash., 1843. T.A.<br />

Conrad Formation: Cretaceous.<br />

Location: On the Missouri river.<br />

? fibrosa u. 8. M. & H. (1856.)<br />

Proc. Acatl. Nat. Sou, Phila., for 1S56, pp. 8

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