Open Context

Descriptive Variable Value(s)
Object Name Bead
Material Clam
Bead Type A1b (medium spire-lopped, 6.5 to 9.5 mm diam)
Type Description Clam disc beads are considered a hallmark of Phase 2 of the Late Period in the Bay Area and their production continued into the early historic period. Initial manufacture of these beads began around A. D. 1500 (Bennyhoff 1967; King 1978:59). Smaller varieties like those in the Building 39 assemblage were common throughout the known period of production, while larger clam discs were produced mainly later in time. Haliotis disc beads were also common from Phase 2 of the Late Period into historic times according to King (1978:59).
Number 1
Thickness (mm) 2.2
Diameter (mm) 5.8
Perforation (mm) 2.2
Begin Date 1500.0
Note Identification numbers assigned by Open Context editors for bead and button analysis records

Suggested Citation

Thad M. Van Bueren. "Item 16 from United States/California/Presidio of San Francisco/Building 39/Artifacts". (2010) In Presidio of San Francisco. . Released: 2010-01-28. Open Context. <> ARK (Archive):

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Managing editor reviewed

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Presidio of San Francisco

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