Correspondence with a Yale geologist whose senior thesis at Univ of Calif was on the Heart Mountain calcibreccia. One of his advisors suggested that perhaps there was a thin zone of interbedded evaporite and dolomite at the break point which provided lubrication for movement on the fault. Pierce counters emphatically that the zone is well-exposed where it is not faulted and has no evidence for evaporites. Krill refers to Pierce's heart problems in 1976 and wishes him improved health.