The Keres Group is a sequence of basalt, andesite, dacite, and rhyolite flows that underlie the southern Jemez Mountains. It overlaps the Polvadera Group to the north and has a maximum thickness of about . It overlies the Santa Fe Group to the south and is overlain by the Tewa Group. Keres volcanism began about 12 million years ago and continued to 6 million years ago. Volcanic activity generally shifted eastward over time during this interval.