History
The first quarter-mile of the cave was known to local ranch-hands by the early 1900s. It was known by the name Mayfield Cave, after the landowner, Stanley Mayfield. In 1955, the landowner gave permission to four cavers from Dallas, who discovered a further seven miles, and what is now considered the most scenic areas. The cave has been operated commercially by the Mayfield family since July 16, 1960. Today, 2 miles (3.2 km) of trail have been developed out of the 7 miles (11 km) of explored cave. The development of the trails was done by Jack Burch, starting in 1959 and completing in 1979. Burch revolutionized cavern development worldwide with his "conservation through commercialization" approach to the project.
The cave is formed in 100 million-year-old (Cretaceous) Segovia limestone, of the Edward Limestone Group. The formation of the cave itself probably occurred between 1.5 to 5 million years ago. The cave is formed primarily along a fault. This fault allowed gases to rise up from depths of around 1.5 miles (2.4 km) to then depths of about 300 feet (91 m). At this depth the gases mixed with water in the aquifer. The resulting highly acidic water dissolved out the limestone, forming the cave. Between 1–3 million years ago, the water drained form the cave. The famous mineral formations, known as speleothems, all formed after the water drained from the cave.
The cave's most famous formation was the butterfly . It was the only known formation like it in the world. It was formed by two fish tail helictite growths that share the same attachment point of the cave wall. On November 21, 2006, the butterfly formation was vandalized by a member of a tour group. Specifically, 60% of the top right tip of the wing was broken off of the formation.
There is a $20,000 reward for any information that leads to the recovery of the missing piece. Since the butterfly is active (still growing), the formation can still be repaired if the piece is recovered soon.
Read more about this topic: Caverns Of Sonora
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