Point Type: LERMA ROUNDED
BASE
Also See: Agate Basin , Allen, Angostura, Eden, Guilford, Lerma
Pointed Base, Nebo Hill, Sedalia
Location: United States, Canada, Mexico, South America
Associated Dates:
10,000 - 5,000 B.P. - Transitional Paleo - Early Archaic
Morphology: Lanceolate
General Description: The Lerma Rounded
Base is a medium to large sized long, ovoid, likely to be leaf-shaped form,
having excurvate sides and a
rounded basal end. Some points have
small serrations
on the blade edges. The stem end contracts to a
rounded shape. The stem is usually lightly ground.
The longer and broader examples of the type are
thought to have doubled as knives or spear points. The blades are thickest
in the middle and then are thinned down to the edges. Some examples were
turned into drills through material conservation.
The type was manufactured by applying Transitional Paleo
flaking technique, irregular pressure and percussion flaking
. Alternate biface bevel flaking
or alternate uniface bevel flaking was used in finishing the blade edges.
The cross section is rhomboid, lenticular with one beveled face, or
lenticular.
The average example measured 109 mm long and 28 mm wide as the
bade base junction which is the widest dimension and averages 9 mm
thick.
The Lerma Rounded Base type apparently lasted over a long period of
time. Suhm and Krieger (1954) suggest that it appeared earliest in
southern Tamaulipas Mexico several thousand years before the Christian
era. The late Paleo to Transitional Paleo affiliation for this tool
is substantiated by its associations in surface collections with the Beaver
Lake and the Greenbrier Dalton point types. In one case, a Lerma
Rounded Base and a large Beaver Lake point were recovered from a
stratified pit in close association.
The point is found in Texas in the Edwards Plateau Aspect
and the Pecos River Focus and the Aransas Focus, all representing the Archaic Period. The point
is found from Alaska through Canada and down into Mexico, South America and all
across the United States.
The Lerma Rounded point type was named
by Richard S. MacNeish for examples that were recovered from the Canyon
Diablo site of Tamaulipas, Mexico and described by Dee Ann Suhm, Alex D. Krieger
and Edward B. Jelks in 1954 in the Bulletin of The Texas Archeological
Society # 25
About the Point Above: The large Lerma Rounded Base knife form pictured at the top of this
page, was found in Humphreys County, Tennessee in 1920's and is from the former
Frank Morast collection. The point still retains the Morast label which states
"Found Stone Blade Humphreys Cnty, 60x 205?" The point
appears to be made from a very dull tan brown Dover chert
and is very heavily patinated, especially along the blade edges. The base edges and blade
surfaces are ground and smoothed. The side of the blade with the
label has been bifacially beveled for resharpening purposes. The edges are
ground 29 mm up each blade edge from the base. The cross section is
lenticular. Overall, the point measures 126 mm in length, is 23 mm wide and is 9 mm
thick in mid blade 54 mm from the base. Most of the blade is only 4.6 mm thick. Catalog Number 5-80-H
References: Baker, Bell (1), Dragoo (4), Overstreet
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