Aden Crater is a small shield volcano, part of the Potrillo volcanic field of New Mexico. It is in Doña Ana County between Santa Teresa, New Mexico and Las Cruces, New Mexico. It is in a remote location that can be hiked and explored. The area has deep caverns that can be very dangerous to inexperienced hikers and cavers. A fossilized ground sloth, now at the Peabody Museum, was found in a fumarole roughly 100' deep located on the SE portion of the crater rim.