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Geologic Unit: Beacon
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Map showing publication footprint
  • Usage in publication:
    • Beacon till
  • Modifications:
    • Original reference
  • Dominant lithology:
    • Till
  • AAPG geologic province:
    • Puget Sound province
Publication:

Mackin, J.H., Mullineaux, D.R., and Stark, W.J., 1950, Glacial geology of Seattle: Washington University-Seattle Trend in Engineering, v. 2, no. 4, p. 19-21.


Summary:

Pg. 19-21. Beacon till. Oldest glacial deposit in area. Consists of stones of all sizes embedded in compact clayey matrix. Deposited directly by ice at base (rather than in front of) an actively moving glacier. Underlies Duwamish formation (new). Age is Pleistocene.
Exposed in brick pit on west side of Beacon Hill just south of Spokane Street in Seattle, northwestern WA.

Source: US geologic names lexicon (USGS Bull. 1350, p. 51).


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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