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Summary of data on the age of the Orca Group, Alaska: A section in <i>The United States Geological Survey in Alaska: Accomplishments during 1984</i>

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George Plafker, Gerta Keller, Steven W. Nelson, Julie A. Dumoulin, and Marti L. Miller, 1985, Summary of data on the age of the Orca Group, Alaska: A section in <i>The United States Geological Survey in Alaska: Accomplishments during 1984</i>: Circular.

Summary

The Orca Group is a widespread, thick, complexly deformed accretionary sequence of flysch and tholeiitic basalt in the Prince William Sound area (Winkler, 1976; Winkler and Plafker, 1981) (fig. 49). Despite a number of extensive field studies of the Orca Group, reliable data on the age of the unit have been elusive. On the basis of sparse paleontologic and radiometric data, the sequence was regarded as Paleocene and early Eocene(?) age (Winkler and Plafker, 1981). New paleontologic data from fossil localities shown in figure 49 suggest that some strata assigned to the Orca Group are of middle Eocene age and possibly as young as late Eocene or Oligocene. However, data suggesting an age younger than about 50 Ma appear to be incompatible [...]

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local-index unknown 70180306
local-pk unknown 70180306
series unknown Circular

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citationTypeReport
journalCircular
languageEnglish
parts
typePublication Place
valueAlexandria, VA

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