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National Geologic Map Database

Geologic Unit: Greenback

Usage:

Greenback Member of Willamette Silt (OR)


Geologic age:

Quaternary
Pleistocene, late


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

From Greenback School, in NE/4 SE/4 sec. 4, T. 13 S., R. 4 W., south 13 km to Irish Bend on Willamette River, Linn Co., OR (Balster and Parsons, 1969).


AAPG geologic province:

Cascades province


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

Asterisk (*) indicates published by U.S. Geological Survey authors.

"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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).