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- Usage in publication:
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- Diamond Hill Member
- Modifications:
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- Named
- Dominant lithology:
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- Clay
- Sand
- AAPG geologic province:
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- Cascades province
Summary:
Named as upper member (of 2) of Rowland Formation (new) for Diamond Hill road which crosses Little Muddy Creek at type section of Rowland Formation, NW/4 SW/4 sec.9 T15S R3W, Linn Co, OR. Consists of clayey sand grading upward into clay. Thickness ranges from 0.9 to 2 m. Conformably overlies Linn Member (Rowland Formation). Unconformably underlies Malpass, Wyatt, or Irish Bend member (all new) of Willamette Silt. Age given as late Pleistocene.
Source: GNU records (USGS DDS-6; Menlo GNULEX).
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 ([ ]).