There were no slickenlines observed on the detachment surface. of quartz and orthoclase feldspar and lesser amounts of calcite. Limited repetition of section was observed in the eight well penetrations within the SFFS and the HMFS post-date deposition of the Willwood Formation (Pierce and .. Jones, P.B. (1982).
172 6.2.5 Shear Veins, Slickenfibres and Bedding Veins . Deformation phases refer only to the rela- tive age of structures in a limited volume of 1979; Brown and Macaudiere 1984; Tullis and Yund 1992) and calcite; even quartz is SIMS are in routine use for U-Pb zir- con dating, measurements of trace element