Azimuthal vertical seismic profile (VSP) data (Lee and Miller, 1985) were analyzed and interpreted in order to delineate the lateral extent of the lower coastal sand bodies in the Mesaverde Group at Rifle, Colo. The interpretation was based mainly on the laterally stacked vertical component of the VSP data, one- and three-dimensional seismic modeling, and the geological interpretation by Lorenz (1985). Individual sand bodies in the coastal interval were difficult to identify or delineate due to the lack of high-frequency content of the seismic data. However, the lower coastal sand bodies (Yellow and Red zones by Lorenz, 1985) were mappable by use of the azimuthal VSP data. The Red sand may trend northeast with an average width of 800 ft, while the Yellow sand may trend northwest with an average width of 600 ft, interpretations which are similar to those based on the sedimentology of these zones by Lorenz (1985). This investigation suggests that an azimuthal VSP survey is applicable for detecting and delineating finite-extent bodies, such as a reservoir boundary.