No soil horizons are identified and probably did not develop due to the high gradient. In some areas, the Pedlar Formation surface is characterized by numerous cracks infilled with basalt, siltstone and fine-grained sandstone, or intermixed basalt and sediment. Crack dimensions average 1.5 cm in width with variable lateral continuity. Some cracks record complex sediment and basalt infill histories. Sediment deposits, associated with the paleotopography, consist of granite with subordinate basalt clasts.
Deposits range from very angular and poorly sorted breccia to rounded and sorted sandstone.
The breccia is considered to represent colluvium that washed off the steep granodiorite highs. Breccias containing intermixed basalt clasts reflect minor reworking of the colluvium by fluvial processes and intermixing of basalt clasts from a distant source. The sorted sandstones indicate significant fluvial reworking of the colluvial material.