Graptolite identification chart for field determination of geologic age

Michael Churkin Jr.; Claire Carter

doi:10.3133/oc66

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Graptolite identification chart for field determination of geologic age

Oil and Gas Investigation Chart 66

By: Michael Churkin Jr. and Claire Carter

https://doi.org/10.3133/oc66

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Plate: Plate 1 (pdf)
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Abstract

Additional publication details
Publication type	Report
Publication Subtype	USGS Numbered Series
Title	Graptolite identification chart for field determination of geologic age
Series title	Oil and Gas Investigation Chart
Series number	66
DOI	10.3133/oc66
Year Published	1972
Language	ENGLISH
Description	1 map. 22 1/2 by 35 inches
Scale	1000000