Pyritic cone-in-cone concretions
Fieldiana. Geology ; v. 33, no. 7
Publication (Field Museum of Natural History) ; 1200
Woodland, Bertram G.
Chicago :Field Museum of Natural History,1975.
"February 10, 1975."
"This volume is dedicated to Dr. Rainer Zangerl."
A number of pyritic cone-in-cone concretions from Middle Pennsylvanian black shales of Indiana and Illinois are described. These are the only occurrences of typical cone-in-cone structure composed of
Fieldiana series has been published as Geological Series by Field Columbian Museum (1895-1909) and Field Museum of Natural History (1909-1943), and as Fieldiana: Geology by Chicago Natural History Museum (1945-1966) and Field Museum of Natural History (1966-).
QE1 .F4 vol. 33, no. 7
552/.5, 550/.8 s
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