Pyritic cone-in-cone concretions
By: Bertram G. Woodland.
Contributors: Field Museum of Natural History.
Series: Fieldiana -- v. 33, no. 7; Publication -- 1200; Publication (Field Museum of Natural History : 1966) -- 1200.
Publisher: Field Museum of Natural History
Published: 1975
Place of publication: [Chicago]
Language: eng
Number of pages: 139
Subjects: Concretions -- Middle West.; Pyrites -- Middle West.; Geology, Stratigraphic -- Pennsylvanian.
Notes: Bibliography: p. 138-139.