It was formed by two fishtail helictite growths that share the same attachment point of the cave wall.

[4] In 1955, Stanley gave permission to four cavers from Dallas, who discovered a further seven miles, including what are now considered the most scenic areas.

In 1957, Jim Papadakis a member of the National Speleological Society, geologist and professional photographer fell in love with the cave.

In February 1960, Jim negotiated a lease with Stanley Mayfield to develop the cave.

Jim hired friend and caver, Jack Burch to help construct the trails and install electrical lighting which provided safe viewing for public tours.

In April 1963, the Texas House of Representatives gave the Caverns of Sonora a special citation.