An alligator juniper, left, frames a large stone made of rhyolite, one of thousands of rock columns in the Chiricahua National Monument southeast of Willcox. The area is excellent for hiking and camping.

Photo by David Sanders/Arizona Daily Star

1924: Chiricahua National Monument is established.

Also in 1924: 1,600 motorists are stranded at points of entrance to Arizona because of the embargo on all vehicular traffic due to a hoof and mouth quarantine. The occupants of 115 cars at Needles threaten to overpower Arizona border guards, and Governor Hunt orders the National Guard readied for duty.

1931: Construction begins on an Army Airways Operations Building at Fly Field in Yuma.

Want to share an important event from Tucson's history? Email it to krumore@azstarnet.com.