Figure 3. Core slab examples of sandy channel facies from the Mesa 1 well. Each slab is approximately 3 inches (7.5 cm) in width. (A) Very fine sandstone containing root traces and caliche nodules, interpreted as soil-modified bar top (“Cu” facies”). (B) Very fine sandstone containing ripple lamination, interpreted as upper bar (“Cb” facies). (C) Mud clast conglomerate, interpreted as channel lag (“Cl” facies). (D) Convolute fine-grained sandstone – likely over-steepened cross stratification, interpreted as lower bar or active channel fill (“Ca” facies). (E) Trough-cross-stratified, fine-grained sandstone, interpreted as lower bar or active channel fill (“Ca” facies). (F) Contorted very-fine sandstone indicating soft sediment deformation. This feature is very common in Pinedale cores and is interpreted to occur in a number of environments, including partially abandoned channels, upper bar facies, and crevasse splays. See Shanley (2004) for additional core photos of stratification types common to Pinedale and Jonah fields.