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Geologic Units: Hyak
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  • Usage in publication:
    • Hyak Member
  • Modifications:
    • Named
  • Dominant lithology:
    • Till
  • AAPG geologic province:
    • Cascades province
Publication:

Porter, S.C., 1976, Pleistocene glaciation in the southern part of the North Cascade Range, Washington: Geological Society of America Bulletin, v. 87, no. 1, p. 61-75.


Summary:

Type locality: till facies, roadcuts along HWY I-90, NW/4 NW/4 sec.15 T22N R11E; outwash facies, cutbank along Coal Creek near town of Hyak, NW/4 SE/4 sec.15 T22N R11E, Kittitas Co, WA. Is top member of Lakedale Drift. Consists of till and lacustrine sediments divided into till and outwash facies. Overlies Domerie Member (new) (Lakedale Drift); underlies Holocene alluvium. May be as young as 11,800 to 11,400 yr B.P. Is Pleistocene age.

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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