This week in our alphabetical trip through
Pennsylvania archaeology, we have reached the letter “X”; and, to keep it
simple, “X” stands for axes, specifically stone axes.
Axes
are one of several hafted stone tool types that are differentiated by the angle
at which the head is seated. An axe blade or head, is hafted parallel to the
handle rather than perpendicular to the handle as in hoes or adzes. There are
two basic axe forms; chipped axes and pecked and polished axes. Chipped axes
have two opposing notches and the notches were used in the hafting process. They
are relatively simple to make and were used during many time periods in
prehistory. Ground and polished axes are grooved for securing the head to the
handle. A full grooved axe has a groove that encircles the entire piece. On the
¾ grooved axes, the groove does not extend to the bottom side.
chipped axe
sketch of full grooved axe
sketch of 3/4 grooved axe
Ground
and polished axes frequently start out as river cobbles that were chosen for
their general size and shape. Metamorphosed siltstone or sandstone, basalt or
diabase was frequently used and sometimes quartzite. Depending on the degree of
stone that needed to be removed to reach the desired shape, axes are first
chipped to remove excess material or if only a small amount of material needs
to be removed, they are pecked into shape. The pecking process involves using a
stone hammer and repeatedly but carefully striking the axe blank, removing
small pieces of the surface. The groove formed early in the manufacturing
process. Once the entire surface was pecked to the desired shape, the axe blank
was rubbed on a piece of sandstone to smooth the surface. Although not found in
Pennsylvania, special axe grinding slabs have been found in the western United
States. In order to attain a very high polish, the final rubbing takes place on
a charred piece of wood.
groove started on an axe blank
Full
grooved and ¾ grooved axes were hafted slightly differently as can be observed
in the figure below. The functional differences, however, are not clear. In
addition, sometimes the groove is bordered by a ridge on one or both sides and
sometime there is a double groove. It is assumed that this was part of the
hafting method but again, the functional differences are not clear. Depending
on the hardness of the stone, the manufacturing process for a full grooved and
completely polished axe required 30 to 60 hours of work.
sketch of hafted axes
finished full groove axe
finished 3/4 grooved axe
double grooved axe
Axes
were sharpened by simply grinding down the bit end as it became worn. Most of
the axes in The State Museum collection are broken or worn down, nearing the end
of their use life. However, some are very large (see below) and some of the
unfinished pieces are extremely heavy weighing 4445 gr or 10 pounds and
measuring 39 cm or 15 inches in length.
large finished full grooved axe
longest axe
heaviest axe
Native
Americans have been using axes to cut wood ever since they arrived in North
America. However, during the Paleoindian period (11,700 - 20,000 BP.) they are neither
notched or polished and difficult to identify unless systematic microwear
studies are conducted. It is not until the Middle Archaic period (6850 – 10,200
BP.) that ground and polished axes are produced. Full grooved axes are the
earliest and ¾ grooved axes do not appear until the (Late Archaic 4850 – 6850
BP.) and become common during the Transitional period (2800 – 4850 BP.).
The
State Museum is initiating an inventory and preliminary analysis of its unprovenienced
collection of grooved and chipped stone axes. This group of artifacts was
received as part of various donated collections such as those from Gerald
Fenstermaker and Samuel Farver and are not located by specific site. They are
primarily from eastern Pennsylvania and mainly the Susquehanna drainage basin.
Up until a month ago, they were stored in boxes and underutilized. For exhibit
or research purposes, we didn’t know what we had unless we inventoried and
catalogued all 54 boxes. Our goal is to make a list of all that we have,
catalogue them by type and take some basic measurements to determine variations
in size, breakage patterns, how they were made and the lithic materials that
were used. Our intern this semester, Tamara Eichelberger from Elizabethtown College,
has volunteered to process the collection. Although they had been washed sometime
in the past, over 40 years of dust had accumulated so they needed to be wiped
clean. Since each will be measured and entered into a data base, each needs an
individual catalogue and specimen number. With the help of volunteers, Tamara
is completing the labeling process and will begin taking measurements next
week. There are over 500 specimens in the collection so she should be able to develop
a good characterization of axes from eastern Pennsylvania. The results of her
analysis will be the subject of a blog in early May.
Tam and her axes
Additional reading
Adams Jenny L.
2014 Ground Stone Analysis: A Technological
Approach. The University of Utah Press, Salt Lake City.
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