Name proposed for rocks of the two basal formations of Derry series, which is newly named, this report: Arrey formation (new, at base) and Apodoca formation (new, at top). Name derived from Green Canyon, about 1/2 mi north of village of Derry, Sierra Co, NM in Orogrande basin, but type locality is a section measured on west-facing slope of hill approximately 3/4 mi east of Derry and is same as type locality for Derry series. 87 ft thick at type [text of report shows 87, but measured section shows 112 ft thick]. Distribution discussed in description of individual formations. Group composed of (ascending): dense, massive limestones; highly nodular limestones with irregular, interbedded, highly calcareous shales; and very common, irregular masses and lenses of chert, nodular limestones, calcareous shales, black to dark-gray calcareous siltstones, and greenish to bluish-gray shales. To south consists of essentially pure limestone. To north is more highly clastic. Highly fossiliferous. Underlies Hot Springs formation (new) of Mud Springs group (new) of Derry series; unconformably overlies Devonian rocks. Is of Pennsylvanian (Derry) age.

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