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National Geologic Map Database

NGMDB

Geologic Unit: John Day

Usage:

John Day Formation (OR*)


Subunits:

(alphabetical) --all in OR: Big Basin Member, /Deep Creek Tuff [Member], Haystack Valley Member, Kimberly Member, Turtle Cove Member.


Geologic age:

Miocene*
Oligocene*
Eocene*


Type section, locality, area and/or origin of name:

Typical exposures are along John Day River. Well exposed in Picture Gorge, north-central OR (Marsh, 1875).


AAPG geologic province:

Eastern Columbia basin*


NGMDB

For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).

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Page Last Modified: Tue Jun 3 17:53:38 2014