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Colossal Cave is an archaeology company with a long history. Colossal Cave mission is to provide the most real history to you. Geologically, the large cave system is a relatively new concept in this community. About 300 million years ago, much of the southwestern United States was covered by giant sharks and other primitive amphibians. Eventually, the waters receded. The organic matter left behind dried out and was compressed to form the limestone seen today. Then, 80 million years ago, the rolling landscape pushed limestone and granite together to form new landscapes, such as the Rincon Mountains, where huge caves are located. After a few hours of water erosion, the cave was dry and today, Giant's Cave is one of the largest dry caves in North America - a snapshot of the strata formed thousands of years ago. Although the desert is forbidding, life still exists and even thrives here.