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Fig. 11 a View of linear
piles of fire cracked rock.
b Close-up of typical fire
cracked rock
FCR from successive occupations. Much of the landscape is littered with FCR and it
is often concentrated in circular mounds 1- 2 m in diameter or linear piles that can
reach more than 200 m long. For mapping purposes FCR units were delineated where
the concentration of FCR was the highest and could be easily identified on the
Quickbird imagery, hence some surfaces with minimal FCR concentration are
mapped as other units. The fire-cracked rock usually overlies silt or dissected/
reworked silt and occurs as angular fragments that are larger than 5 cm (Fig.
11
). The
pattern of FCR distribution on the site is variable. Areas such as Los Monticulos, and
El Canal contain the highest concentration of FCR. Hornos Alineados also preserves
significant quantities of FCR arranged as mounds and linear piles.
Minor Channel Sands: Qmcs
Minor channel/bar sands are channels and associated features that are mapped
within the site other than the main channel of the Rio Boquillas. These are small
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