A “core” is a large stone that is shaped for the purpose of obtaining large flat and sharp
flakes when struck with a stone or bone hammer.  The large flakes are then used for the
manufacture of smaller tools such as scrapers, knives, points, drills, reamers, etc.  There
were 27 cores recovered during project monitoring.

All obsidian chipped stone tools that appeared to have diagnostic shapes were submitted for
hydration analysis.  Hydration readings were converted to approximate years B.P. (Before
Present) using Thomas Origer's (1993) rate for Napa obsidian and the Borax Lake/Napa
obsidian conversion factor developed by Kim Tremaine and Dave Fredrickson (1988).
Site maintained as a public service by Archaeological Research, PO Box 1353, Lucerne, CA 95458.
Elem Cores
History and Prehistory of Lake County
and Beyond
Angular Cores (23)

These made up the majority of cores
recovered.  These were multi-platform cores
where flakes were removed from whatever
face happened to be convenient or showed
the most promise in the flake removal
process.  All but two were Borax Lake
obsidian.  Two were basalt.
Single-Platform Core (1)

This spent Borax Lake obsidian core was
short and all flakes had been struck from a
single platform (0-299).
Large Flake (3)

Any flake at least 5cm long or wide was
considered a large flake.  These flakes are
large enough to have been further
manufactured into most of the points,
knives, flake tools, and other chipped
stone implements found at the site.