Pg. 1814, 1843-1845. Tenderfoot member of Moenkopi formation. Dominantly muddy or silty poorly sorted sandstone. Commonly at base, generally directly overlying Cutler formation, is sequence of beds up to 20 feet thick composed of weathered coarse arkosic detritus which is locally overlain by gypsum as much as 7 feet thick; next is unit of brick-red or orange- to dark-brown poorly sorted sandy mudstone to silty sandstone, which at most places makes up more than 80 percent of member; at most localities, this unit is succeeded by sequence of distinctly bedded sandstone. Thickness ranges from featheredge to 290 feet. In vicinity of Gateway, southwestern Colorado, thins toward Uncompahgre Plateau; thinning due to overlap of basal beds and to truncation of top of member by overlying Chinle formation; locally cut out over salt intrusions by angular unconformity at base of overlying Ali Baba member (new) in Sinbad and Paradox Valleys, southwestern Colorado, and probably in Fisher Valley, southeastern Utah. Locally overlies Paradox member of Hermosa formation. Age is Triassic(?).
Type section: east side of Sinbad Valley, in sec. 15, T. 49 N., R. 19 W., Mesa Co., southwestern CO. Named from Tenderfoot Mesa, Mesa Co., southwestern CO, where it constitutes whole of formation on north side of mesa.

Source: US geologic names lexicon (USGS Bull. 1200, p. 3850-3851).

Pg. 1858. Tenderfoot member of Moenkopi formation. Correlated with the Hoskinnini member herein reallocated to member status in Moenkopi. [Age is Triassic(?).]
[Area of study between Moab, southeastern UT, and Kayenta, northeastern AZ.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 3850-3851).