A groundwater monitoring system installed at the study site has shown that the phreatic surface within the lateral
channel bar remains approximately horizontal.
Vertical stacking of sandstones is the signature of
channel bar and channel fill deposits of aggrading low sinuosity streams which migrate laterally across an alluvial plain (Gordon and Bridge, 1987).
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It is possible there to identify the environments in the Caballos Formation, including fluvial channels in the lower part (Unit U1), tidal channels (units U2 and U3), tidal flat marsh and crevasse splays, with the possible presence of
channel bars. The interpretation map of figure 8A is geologically consistent with a previous interpretation map done by Amaya (1997) in Figure 8B, but a better discrimination of the channel and the other facies are visible in Figure 8A.