Figure 11. Other notable wells. The Placid WXC-Barton 1, Williams Exploration Monroe Fee 1, and Phillips Petroleum US-E 1 are other wells with key shows in reservoirs older than the Jurassic Navajo Sandstone, most commonly in the Triassic Sinbad Limestone Member of the Moenkopi Formation. The Barton well is also noted for being the only well in central Utah to contain deadly concentrations of hydrogen sulfide gas and very high down-hole temperatures. Data are from mud log and personal notes of Doug Sprinkel.