There are some excellent exposures (Figure 4) of an unusual course, polymict, clast-supported sedimentary deposit with well-rounded boulders of a number of different lithotypes including granitic and other felsic rocks, basaltic greenstone, chert and limestone. Boulders are up to a metre in diameter (Stidolph, 1977) but most range from 5 to 30 cm. This wedge-shaped outcrop is up to 300 m thick and extends for 2.3 km. Very good examples of pressure solution can also be seen. The origin of this deposit is up for debate.
In this outcrop, there is a deformed granite with anastomosing subhorizontal fractures, which is weathered with brownish iron oxide staining. It has yielded a very complex set of zircons, with inherited cores as old as 3.4 Ga, with 2.7 Ga overgrowths, and a final overgrowth at 2.07 Ga, which is possibly the age of intrusion of the granite, which was subsequently deformed (Master et al., 2013a,b).
Stidolph (1977) assigned these outcrops to the lower unit of the Shamvaian Group which consists of volcaniclastic sediments and pyroclastic rocks devoid of granitic clasts. These rocks form an extensive belt stretching across much of the south-eastern limb of the Shamva Belt.
Mixtures of sedimentary and pyroclastic deposits can be seen over scattered outcrops at this locality, indicating reworking of fine pyroclastic material and agglomerates. Some unusual textures of debateable origin are present.
At this outcrop locality, about 10 km further NW from the previous stop, there are numerous roadside outcrops of strongly recrystallized pink paragneiss of the Malaputese Group. The gneisses are interpreted as meta-arkoses, and some show relict cross bedding. They have yielded a detrital zircon population that ranges in age from 2254 ± 18 to 2796 ± 17 Ma, with a strong age peak at ca. 2.7 Ga (Master et al., 2013a,b).
Many of extrusive rocks within the Shamvaian are porphyritic and have been interpreted as crystal tuffs with plagioclase phenocrysts, but on fresh surfaces these are difficult to see. The rocks range in composition from rhyolite to dacite and some may be intrusive.