Digging southern half of trench until we come down on wall from SLT1. Began digging locus 3 (below locus 2), a very light colored silty soil with high stone content. Located within this matrix is locus 4, what seems to be a disturbed cromlech feature containing a horse mandible. Took radiocarbon sample from just east of feature (Ar/Ts.SLT4.3.C14.1). Half of the feature remains in western baulk at this point.