It is markedly banded, comprised of alternating blue and light gray layers of limestone and dolomitic limestone. There is little or no evidence of metamorphism, even adjacent to a granitic intrusive at the Pacific Fluorite Mine. The Bonanza King is conformably overlain by Cambrian Nopah Formation and Ordovician Pogonip Group. Keaney-Mollusk Mine thrust fault, Microwave Tower Hill. Structure Figure 1 presents the results of our field mapping.
Stratigraphic relationships are generally straightforward in the southern portion of the map area.
The fault plane dips west at 20-30 . Rocks along the fault plane are unbrecciated. There, the continuation of the KMM fault southward from Microwave Tower Hill can be seen to juxtapose upper plate Bonanza King and lower plate Cretaceous Delfonte Volcanics. Furthermore, the geometry of this fault is markedly similar to that of the Keystone thrust in the southern Spring Mountains. KMM thrust exposed north of Chaos Hill.