... unit, the Halgaito tongue, in the vicinity of Mexican Hat. Forms referable or close to known Four Corners genera are: Xenacanthus aff. X. texensis, Eyrops sp., Platyhystrix cf. P. rugosus, Diadectes sp., a limnoscelid, Ophiacodon cf. O. navajovicus, and a sphenacodontid pelycosaur. Of 3 kinds...

... the uplift, and the number of shale beds also increases in that direction. Adjacent to the uplift they grade into drak gray-green shales and siltstones and into fine-grained redbeds. With the single exception of the Mexican Hat synclinal oil field (T. 41–42 S., R. 18–19 E., San Juan County, Utah), all...

...Figure 2. Oblique air photo of gravel deposits above Mendenhall Loop on San Juan Canyon, near Mexican Hat, Utah. Gravel-capped interfluves on upper surface are visible in foreground, and gravels are exposed in light-colored pit. Loop is 1 km across rim to rim. ...

...FIG. 12. —Exposed algal mound of lower Ismay cycle in San Juan River canyon east of Mexican Hat, Utah. ...

...Fig. 10. —Systematic joints and cross-joints in massive siltstones of Halgaito about 1 mile east of Mexican Hat, Utah. San Juan River in foreground. Height of outcrop about 20 feet. ...

..., Utah) Jan. 1999 35.43 20.79 2.64 54.31 4.24 517 98SJ-12 San Juan River (Farmington, N.Mex.) Oct. 1998 32.93 58.16 2.35 58.16 1.14 760 99SJ-2 San Juan River (Mexican Hat, Utah) Jan. 1999 51.30 21.24 2.64 76.78 .98 1067 99CO-1 Colorado River (Lee's Ferry, Ariz.) Jan...

... and to make unlimited photo copies of items in this journal for noncommercial use in classrooms to further education and science. Wolkowinsky and Granger (2004) analyze gravels deposited by the San Juan River near Mexican Hat and Bluff, Utah, for their abundances of 26 Al and 10 Be and the ratio...

...Fig. 8. —Mexican Hat (permeability trap associated with syncline), San Juan County, Utah. ...

...) highlands. 1 Prepared as a result of the 1950 Frost Expedition down the San Juan and Colorado rivers from Mexican Hat, Utah, to Lees Ferry, Arizona. This is the first published report of limestone reefs in the Hermosa section of the area common to the four states: Arizona, Colorado, New Mexico...

... the Morlet, Gaussian, and Mexican Hat. The well-log facies association VI is characterized by a very thick (∼50 m) coarsening up funnel-shaped GR patterns with fine grains at the base. The resistivity logs are shown opposite the GR logs and the patterns are mirrored. It is observed in the Carbonera...

... is a redbed sequence overlying the “Rico formation,” and was named for exposures at Halgaito Spring near Mexican Hat, Utah. Rocks assigned to the Halgaito were considered Pennsylvanian in age by Turnbow (1955) and Wengerd and Matheny (1958) . Cedar Mesa Sandstone. —The Cedar Mesa sandstone...