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Geologic Unit: Malpass
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  • Usage in publication:
    • Malpass Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Clay
  • AAPG geologic province:
    • Cascades province
Publication:

Balster, C.A., and Parsons, R.B., 1969, Late Pleistocene stratigraphy, southern Willamette Valley, Oregon: Northwest Science, v. 43, no. 3, p. 116-129.


Summary:

Named for Malpass Lane, north-south road 4.8 km east of type section as second from uppermost member (of 4) of Willamette Formation [Silt]. Type section designated as exposures in cutbank of Willamette River at Irish Bend, center sec.7 T14S R4W, Linn Co, OR. Consists of gray clay with iron-manganese oxide concretions. Is 1 m thick. Unconformably overlies Irish Bend or Wyatt Member (both new) of Willamette Silt. Underlies Greenback Member (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 ([ ]).

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