[2] The lower member is a sandy or silty conglomerate containing mostly Hondo Group quartzite rock fragments (clasts) ranging in size from 2 millimetres (0.079 in) to over 2 meters (6.6 ft) in diameter.

The conglomerate is greenish to pale yellow in color, poorly sorted, and moderately to well rounded.

The member contains some well-developed normal grading sequences a few to tens of centimeters thick.

Ash beds from the Amalia Tuff eruption have been identified within the member, with ages of 23 and 27 Ma, interpreted as pre- and post-caldera pumices.

[3] The upper member is red to purple volcaniclastic conglomerate and sandstone, typically carbonate cemented.