Name proposed for the rhyolite that forms five small rhyolite domes and a small pumice cone in the northern Jemez Mountains. Named for El Rechuelos, a small steep draw which drains the western side of Polvadera peak in Abiquiu quad, Rio Arriba Co, NM in San Juan basin, and passes just south of the two largest domes of the formation. Is top of three members of Polvadera Group (new). Includes: small pumice cone of El Lagunito de Palo Quemador, 2.5 mi north of Polvadera Peak (T21N, R5E); two pumiceous rhyolite domes about 2 mi northwest of Polvadera Peak; and two lithic rhyolite masses at head of Canoncito Seco, about 5 mi southwest of Polvadera Peak. The several masses rest on dacitic rocks of Tschicoma Formation (new), and a few are locally overlain by Bandelier Tuff (new). Radiometric age of 2.0 m.y., obtained on largest dome, indicates an early Pleistocene age, but two masses at the head of Canoncito Seco may be older, judging from their degree of denudation and alteration.

Source: GNU records (USGS DDS-6; Denver GNULEX).