 This canyon and its surrounding upland edge contains numerous sites ranging from dry rockshelters to burned rock middens to upland “hearth” fields.The canyon is primarily recognized for Bonfire Shelter, Kelly Cave, Eagle Cave, and other natural shelters that were used by Native Americans up to 13,500 years ago.Bonfire Shelter features a prehistoric bison jump, where wild herds of bison were driven off the cliff edge by Native American hunters and died below.