micro drills, micro-drills, stone drills, miniature stone/flint/chert drills.
Micro-drills were used to make
Mississippian shell beads, disk beads, and other items.
THE KUNNEMANN SITE AT CAHOKIA MOUNDS
a few pics of the micro-drills and associated materials collected by Gregory
Perino. He understood the importance of keeping the micro-blades and cores
as well as the drills. This collection is typical of the rest of the
Kunnemann micro-drill assemblage. He collected these drills and about 30
other items in only 6 1/2 hours. The overwhelming majority of these drills
were made from Burlington flint, precisely, Crescent Quarry, Burlington chert.
Occasionally, drills were made of Kaolin chert/flint, and Mill Creek
(Click on thumbnails for
THE WHOLE AND
REWORKED (bi-pointed) DRILLS
These are the whole and/or reworked drills. Many have been resharpened and
are no longer their original shape or length. Some exhibit extensive use
wear on the bits.
They may have been hafted
by inserting one end into a piece of river cane below the knock. Cutting the
cane below the knock produces a "D" shaped cross-section. The "D' shape is
perfectly suited to installing a three-sided micro-drill so that no adhesive
is needed. When the drill becomes dull it is removed and reinserted
backwards to expose a new tip. The drills can also be easily removed for
resharpening and quickly reinserted.
These are the
snapped micro-drills from the collection. Many show signs of being
while in use. That is, they
exhibit a sort of twisted flake at the snap. This is most likely due to the
torque that the drill is under when the break occurs.
Not all micro-drills are
bi-pointed as this pic shows. A large number of micro-drills are used
without hafting and just one point is used. Some of these may have been
hafted using a larger hafting system.