found in the closely associated Nondeweni Greenstone Belt also of the Kaapvaal Craton, located about 300 km south of the Barberton Greenstone Belt [@Hofmann2007]. In both belts, dacites are found which meet the recording challenges discussed above. In a sense, they are goldilocks recorders. They have a relatively low Fe content– enough to record the ancient field, but not so much that massive amounts of secondary magnetic minerals have formed during metamorphism.\

Conglomerate Test
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One of the most powerful tests to determine whether a rock can retain a primary record of the magnetic field is the conglomerate test [@Graham1949] (Figure 4). If the magnetization directions from individual clasts forming a conglomerate are the same, that direction must postdate deposition. If the magnetizations differ, the clasts may retain a record of the geomagnetic field prior to deposition, and possibly dating to the formation of the rock from which a given conglomerate clast was derived. There is an important, and sometimes overlooked, limitation with the application of this test. Because different rocks types will respond differently to a given set of metamorphic conditions, the conglomerate test only applies to the lithology sampled in the conglomerate test.

In the Barberton Greenstone Belt, 