general record for each site was prepared which included site
description, location, general environmental data, brief descriptions
of artifact and feature types, and a sketch map. Petroglyphs
were then individually numbered using removable masking tape.
A petroglyph record was filled out, a scale drawing made,
and photographs in both black and white and color were taken
of each petroglyph. A videotape of one site, El Corozal Viejo
(N-RIO-3) was produced.
conditions were often less than ideal for photography. A portable
reflector was used extensively to direct sunlight at an oblique
angle onto the petroglyph surface. Often this produced shadows
that brought out fine details, particularly in badly eroded
petroglyphs, enabling the sketcher to see details that might
have been missed.
one might expect, the sketches often brought out detail clearer
than the photographs. Yet, this was not always the case. In
fact, the photographs showed greater detail than the sketches
in about 10% of the cases, especially after being scanned
and the contrast enhanced in Photoshop.
the fieldwork was completed, site record and petroglyph record
information was entered into a computer database. All photographs
were scanned, enhanced in Photoshop, and printed out for the
report. All sketches and maps were inked. Forms, photographs,
and computer discs with data and images were submitted in
English and Spanish to the Department of Archaeological Research
in Managua for archiving.
the 1995 Field season, four sites were recorded. The greatest
concentration of petroglyphs was noted at N-RIO-3, probably
recorded by Haberland as Om-38. Located at the top and along
the slopes of a ridge, the site contains 82 boulders with
petroglyphs, six mortars, two metates and a light scatter
of ceramics and chert lithics.
1996, a three person crew recorded six additional sites, containing
149 petroglyphs, mostly on land owned by the cooperative at
1997, the program was expanded to include volunteers. 20 volunteers
participated in recording fifteen additional sites. The most
impresive site, N-RIO-19, had an area greater than 180,000
square meters. The site contained 92 petroglyphs, over 30
house mounds, stone statuary fragments, and pottery from at
least three different periods of occupation. This material
is currently being studied in Managua.