Geological Survey of the State of New York.

PALEONTOLOGY:

VOL. V. PART II.

TEXT.

CONTAINING DESCRIPTIONS OF THE

GASTEROPODA, PTEROPODA AND CEPHALOPODA

OF THE

UPPER HELDERBERG, HAMILTON, PORTAGE AND CHEMUNG GROUPS.

BY JAMES HALL,

STATE GEOLOGIST.

ALBANY, N. Y.:

CHARLES VAN BENTHUYSEN & SONS.

1879.

ORD LIBRARY

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