English San Andres Formation, United States Cited by user Kent G. Budge on 21 Sep 2020 The San Andres Formation is a geologic formation found in in New Mexico and Texas. It contains fossils characteristic of the late Leonardian (Kungurian) Age) of the…
English Yeso Group Cited by user Kent G. Budge on 21 Sep 2020 The Yeso Group is a group of geologic formations in New Mexico. It preserves fossils dating back to the Kungurian (lower Permian period.).