REVISION HISTORY

Geologic Map of the eastern half of the Vail 30' x 60' Quadrangle, Eagle, Summit, and Grand Counties, Colorado

By Karl S. Kellogg, Ralph R. Shroba, Wayne R. Premo, and Bruce Bryant

2011

U.S. Geological Survey Scientific Investigations Map 3170

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First posted September 8, 2011


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Revised edition: Posted January 2012

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Note: Changes were made the the online pamphlet only.  The paper edition retains the older version of the pamphlet.

Changes were made to Table 1, p. 29 of the pamphlet.

In the abbreviation subhead: San, sanidine; was added, and AFT, apatite fission track was removed.

Changes were made to the first three letter designations on the table (column "letter on map")

Letter A: AFT date was removed and replaced with "40Ar-39AR date on san"

Letter B: AFT date was removed and replaced with "40Ar-39AR date on san"

Letter C: AFT date was removed and replaced with "40Ar-39AR date on san"

*****No other changes were made*****