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Carlsbad Caverns National Park World Heritage Site

Parc national des grottes de Carlsbad, United States

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Description

Carlsbad Caverns National Park is a United States National Park in the Guadalupe Mountains in southeastern New Mexico. The primary attraction of the park is the show cave, Carlsbad Cavern. Carlsbad Caverns National Park is open every day of the year except Christmas Day. Visitors to the cave can hike in on their own via the natural entrance or take an elevator from the visitor center.

The park entrance is located on US Highway 62/180 approximately 18 miles (29 km) southwest of Carlsbad, New Mexico. Carlsbad Caverns National Park participates in the Junior Ranger Program. The park has two entries on the National Register of Historic Places: The Caverns Historic District and the Rattlesnake Springs Historic District. Approximately two thirds of the park has been set aside as a wilderness area, helping to ensure no future changes will be made to the habitat.

Carlsbad Cavern includes a large cave chamber, the Big Room, a natural limestone chamber which is almost 4,000 feet (1,220 m) long, 625 feet (191 m) wide, and 255 feet (78 m) high at the highest point. It is the third largest chamber in North America and the seventh largest in the world. The largest chamber in the world is the Sarawak Chamber in Malaysia.

250 million years ago, the area surrounding Carlsbad Caverns National Park served as the coastline for an inland sea. Present in the sea was a plethora of marine life, whose remains formed a reef. Unlike modern reef growths, the Permian reef contained bryozoans, sponges, and other microorganisms. After the Permian Period, most of the water evaporated and the reef was buried by evaporites and other sediments. Tectonic movement occurred during the late Cenozoic, uplifting the reef above ground. Susceptible to erosion, water sculpted the Guadalupe Mountain region into its present-day state.

Carlsbad Caverns National Park sits in a bed of limestone above groundwater level. During cavern development it was within the groundwater zone. Deep below the limestones are petroleum reserves (part of the Mid-Continent Oil Field). At a time near the end of the Cenozoic, hydrogen sulfide (H2S) began to seep upwards from the petroleum into the groundwater. The combination of hydrogen sulfide and oxygen from the water formed sulfuric acid: H2S + 2O2 → H2SO4. The sulfuric acid then continued upward, aggressively dissolving the limestone deposits to form caverns. The presence of gypsum within the cave is a confirmation of the occurrence of this process, as it is a byproduct of the reaction between sulfuric acid and limestone.

Once the acidic groundwater drained from the caverns, speleothems began to be deposited within the cavern. Erosion processes occurring above ground created the natural entrance to the Carlsbad Caverns within the last million years. Exposure to the surface has allowed for the influx of air into the cavern. Rainwater and snowmelt percolating downward into the ground pick up carbon dioxide; once this water reaches a cavern ceiling, it precipitates and evaporates leaving behind a small calcium carbonate deposit. Growths from the roof downward formed through this process are known as stalactites. Additionally, water on the floor of the caverns can contain carbonic acid and generate mineral deposits by evaporation. Growths from the floor upward through this process are known as stalagmites. Different formations of speleothems include columns, soda straws, draperies, helictites, and popcorn. Changes in the ambient air temperature and rainfall affect the rate of growth of speleothems, as higher temperatures increase carbon dioxide production rates within the overlying soil. Color of speleothems is determined by the trace constituents in the minerals of the formation.

From a young age, Jim White explored the cavern with his homemade wire ladder. When he grew older, most people did not seem to believe such caves existed. He gave many of the rooms their names, including the Big Room, New Mexico Room, Kings Palace, Queens Chamber, Papoose Room, and Green Lake Room. He also named many of the cave's more prominent formations, such as the Totem Pole, Witch's Finger, Giant Dome, Bottomless Pit, Fairyland, Iceberg Rock, Temple of the Sun, and Rock of Ages.

The town of Carlsbad, which lends its name to the Cavern and National Park, is in turn named after the Czech town formerly known by the German name Karlsbad (English spelling Carlsbad) and now known by the Czech name Karlovy Vary, both of which mean "Charles' Bath[s]."

Until 1932, visitors to the cavern had to walk down a switch back ramp-sidewalk that took them 750 feet below the surface. The walk back up was tiring for a lot of visitors. In 1932 the National Park opened up a large visitor center building that contained two elevators that would take visitors to the caverns below. The new center included a cafeteria, waiting room, museum and first aid area.

Carlsbad Caverns sees an average of 407,211 visitors every year. The highest attendance seen in a year was 876,500 visitors in 1976. As of 2011, a total 41,654,278 visitors have entered the park. Peak visitation typically occurs on the weekends following Memorial Day and the Fourth of July. Free admittance for self-guided tours is often granted on holidays such as Martin Luther King, Jr. weekend, National Park Week, and Veterans Day weekend. Camping is permitted in the back country of the park, but a permit is required from the visitor center.

One of the extra events hosted by the park is the viewing of a bat flight. A program is given in the early evening at the amphitheater near the main entrance prior to the start of the flight, which varies with the sunset time. Flight programs are scheduled from Memorial Day weekend through the middle of October. Optimal viewing normally occurs in July and August with the arrival of the bat pups in addition to the normal migratory bats. Morning programs are also hosted pre-dawn to witness the return of bats into the cave. Once a year, a bat flight breakfast is held where visitors can eat breakfast at the park prior to the morning return of bats.

At various times throughout the year, star parties are hosted by the park at night. Rangers host informational programs on the celestial night sky and telescopes are also made available. These parties are often held in conjunction with special astronomical events, such as a transit of Venus.

In 1985 a very distinctive method of exploration was invented. In a dome area 255 feet (78 m) above the Big Room floor not far from the Bottomless Pit, a stalagmite leaned out. Using a balsa wood loop with helium-filled balloons attached, the explorers—after several tries over several years—floated a lightweight cord that snagged the target stalagmite. Once the cord was in position up, over, and back to the ground, a climbing rope was pulled into position, and the explorers ascended into what they named The Spirit World. A similar, smaller room was found in the main entrance corridor, and was named Balloon Ballroom in honor of this technique.

In 1993, a series of small passages totaling nearly a mile in combined length was found in the ceiling of the New Mexico Room. Named "Chocolate High", it was the largest discovery in the cave since the Guadalupe Room was found in 1966.

The Bottomless Pit was originally said to have no bottom. Stones were tossed into it, but no sound of the stones striking the bottom was heard. Later exploration revealed the bottom was about 140 feet (40m) deep and covered with soft dirt. The stones made no sound when they struck the bottom because they were lodged in the soft soil.

The park contains over 118 caves. Three caves are open to public tours. Carlsbad Caverns is the most famous and is fully developed with electric lights, paved trails, and elevators. Slaughter Canyon Cave and Spider Cave are undeveloped, excepted for designated paths for the guided "adventure" caving tours.

Lechuguilla Cave is well known for its delicate speleothems and pristine underground environment. Guano mining occurred in the pit below the entrance in the 1910s. After gaining permission from the national park managers to dig into a rubble pile where wind whistled between the rocks when the weather changed, cavers broke through into a room in 1986. Over 120 miles of cave passage has been explored and mapped. It has been mapped to a depth of 1,600 feet (490 m), making it the deepest limestone cave in the U.S. To protect the fragile environment, access is limited to permitted scientific expeditions only.

Seventeen species of bats live in the park, including a large number of Mexican free-tailed bats. It has been estimated that the population of Mexican free-tailed bats once numbered in the millions but has declined drastically in modern times. The cause of this decline is unknown but the pesticide DDT is often listed as a primary cause. Populations appear to be on the increase in recent years but are nowhere near the levels formerly estimated to have been present. A study published in 2009 by a team from Boston University questions whether millions of bats ever existed in the caverns.

Many techniques have been used to estimate the bat population in the cave. The most recent and most successful of these attempts involved the use of thermal imaging camera to track and count the bats. A count from 2005 estimated a peak of 793,000.

The Mexican free-tailed bats are present from April or May to late October or early November. They emerge in a dense group, corkscrewing upwards and counterclockwise, usually starting around sunset and lasting about three hours. (Jim White decided to investigate the caverns when he saw the bats from a distance and at first thought they were a volcano or a whirlwind.) Every early evening from Memorial Day weekend to mid October (with possible exceptions for bad weather), a ranger gives a talk on the bats while visitors sitting in the amphitheater wait to watch the bats come out.

Three hiking trails and an unpaved drive provide access to the desert scenery and ecosystem. The developed portion around the cave entrance has been designated as The Caverns Historic District.

A detached part of the park, Rattlesnake Springs Picnic Area, is a natural oasis with landscaping, picnic tables, and wildlife habitats. As a wooded riparian area in the desert, it is home to remarkable variety of birds, over 300 species have been recorded About 500 species have been recorded in the whole state of New Mexico. Rattlesnake Springs is designated a historic district on the National Register of Historic Places. The National Audubon Society has designated Rattlesnake Springs an Important Bird Area (IBA). The natural entrance to the caverns is also an IBA because of its colony of Cave Swallows, possibly the world's biggest.

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Official Record

  • WDPA ID93291
  • NameCarlsbad Caverns National Park
  • Original NameParc national des grottes de Carlsbad
  • Country / TerritoryUSA
  • Sub locationUS-NM
  • IUCN CategoryNot ApplicableWhat is this?
  • English DesignationWorld Heritage Site
  • Designation TypeInternational
  • StatusInscribed
  • Status Year1995
  • Reported Area km2189.26
  • Marinefalse
  • Governance TypeNot Reported
  • International Criteria(vii)(viii)
  • Management AuthorityNot Reported
  • Management Plan URLNot Reported

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