Today Barbara, Toby and I visited nearby Montezuma Well National Monument. Montezuma Well is a sinkhole, in a limestone formation, that is estimated to be between 11,000 and 15,000 years old. The limestone formation is approximately 300 million years old. It was a coral reef formed in a shallow sea. Approximately 1.5 million gallons of water flows up from below, into the sinkhole, out through a spring at the surface and into a nearby creek. The water from the well was used by the Sinagua people for irrigation of their crops and as a source of drinking water. It is believed that this helped these people to thrive but ultimately led to their demise. This water contains elevated levels of CO2 and arsenic. Due to the elevated levels of CO2 fish cannot live in this water.
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