The physical conditions indicated by the flora of the Calvert formation.
Series: Shorter contributions to general geology -- 1916.; Professional paper. United States Geological Survey -- 98-F.; Professional paper (Geological Survey (U.S.)) -- 98-F.
Publisher: Govt. Print. Off.
Published: 1916
Place of publication: Washington
Language: eng
Number of pages: 73
Subjects: Paleobotany -- Miocene.; Paleobotany -- Washington (D.C.); Paleobotany -- Virginia.
Other titles: The Calvert formation.