Faulted calc-silicate and chert layers, Happy Valley, near Tucson, AZ


I collected this in the mid-1970s in the Rincon Mountain area, while working on metamorphic core complexes.  I like the fact that the gory details of fault attributes are disclosed, revealing so clearly that faults are not simple ‘straight lines’ that neatly cut and displace ‘neat layers.’

Age & Formation
Horquilla Formation of Pennsylvanian age, ~320 Ma.
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