TrP - Triassic and Permian Sedimentary Rocks

(Includes Moenkopi Formation, Kaibab Limestone, and Toroweap Formation)

Moenkopi Formation

Approximate Thickness

0-400 feet.

Lithologic Description

Siltstone, mudstone, claystone, and sandstone; interbedded, moderate-red to pale-reddish-brown and grayish-red. Contains a conglomerate at the base and stringers of gypsum in the upper part.

Water-Bearing Characteristics

Generally above the water table; can yield small amounts of water to wells in the northeast corner of the area.

Kaibab Limestone

Approximate Thickness

0-400 feet.

Lithologic Description

Limestone, crystalline, some dolomitic, very pale orange to yellowish-gray, very light gray and white, thin-bedded. Contains nodules and thin beds of chert and beds of calcareous sandstone, fine-grained, yellowish-gray to nearly white.

Water-Bearing Characteristics

Generally above the water table; yields small amounts of water to springs in the north-central and southeastern parts of the area.

Toroweap Formation

Approximate Thickness

0-350 feet.

Lithologic Description

Sandstone, siltstone, and mudstone. Sandstone, fine- to coarse-grained, grayish-orange to grayish-orange-pink, light gray, yellowish-gray and white, some calcareous or argillaceous. Siltstone and mudstone, pale-reddish-brown; interbedded with sandstone in upper part of unit.

Water-Bearing Characteristics

Generally above the water table; yields small amounts of water to springs in the north-central part of the area.

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