Figure F104. Microgabbro intrusions. A. The contacts of the coarse-grained gabbro with the microgabbro are sharp, but irregular, with variable dips (interval 176-735B-137R-6, 99-130 cm). B. The intrusive nature of the microgabbro is illustrated by a weak magmatic foliation and a few deformed schlieren of coarse-grained host rock, both parallel to the contacts (interval 176-735B-165R-3, 91.5-127.5 cm). C. The contact of the microgabbro with the coarse-grained gabbro is subvertical; it is overprinted by a felsic vein at the top of the piece (interval 176-735B-202R-7, 102-122 cm). D. The contacts of the microgabbro with the coarse-grained gabbro are subvertical and sinuous. The fine-grained layer is locally 1 cm thick (interval 176-735B-189R-3, 90-120 cm).