Sunday, October 19, 2008

Guadalupe Mountains and Carlsbad Caverns

Location: Southeastern New Mexico/Western Texas

Click for Larger Image of the Guadalupe Mountains

250 million years ago, the land that is now the Guadalupe Mountains was under the water of a shallow sea. The mountains were created when countless organisms, such as seashells, algae and sponges, died and fell to the bottom where the limy parts of their bodies were "cemented" together forming a huge underwater reef. Fast forward to 10-12 million years ago -- the sea was long gone, but the reef, now buried under layers of sediment, was uplifted and the sediments eroded to reveal it once again. Guadalupe Peak, just visible in this image as the lighter peak directly behind the dark foreground peak, is the highest point in Texas (8749 feet).

Click for Larger Image of Carlsbad CavernsCarlsbad Caverns also developed from this reef. As the reef was pushed upwards, rainwater mixed with hydrogen sulfide-rich water from oil and gas fields in the area to form sulfuric acid, which ate away the limestone of the reef and created the caverns we see today.

Click for Larger Image of Carlsbad CavernsOnce the caves were formed, drops of water infused with carbon dioxide (a weak acid) picked up minute amounts of calcite from the limestone and, as it trickled through the rock into the caverns, deposited this calcite to form both the stalactites (the formations hanging from the ceiling of the cave), and, from the solution that dripped off the end-points of the stalactites, the stalagmites (the formations rising towards the stalactites). Billions and billions of drops later we see these rock formations that have now taken the shape of cones, pillars, and slender, fragile straws.

Here are more images from inside Carlsbad Caverns:

 Click for Larger Image of Carlsbad Caverns Click for Larger Image of Carlsbad Caverns Click for Larger Image of Carlsbad Caverns Click for Larger Image of Carlsbad Caverns

2 comments:

Richard said...

Great photos -- well explained. Carlsbad Caverns is one of the best open to the public. Since I was last there the stalagmites have probably added a couple inches.

Way cool!!

Mary Persall and Jerry Persall said...

One of the best memories I have of my family's move across country back in 1958. I hope the bats remember me.
Jerry