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Image: Boxwork in Wind Cave
Boxwork in Wind Cave
Boxwork in Wind Cave
Boxwork in Wind Cave

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Image: Boxwork in Wind Cave
Boxwork in Wind Cave
Boxwork in Wind Cave
Boxwork in Wind Cave

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Image: Boxwork in Wind Cave
Boxwork in Wind Cave
Boxwork in Wind Cave
Boxwork in Wind Cave

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Image: Boxwork in Wind Cave
Boxwork in Wind Cave
Boxwork in Wind Cave
Boxwork in Wind Cave

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Image: Cave Popcorn in Wind Cave
Cave Popcorn in Wind Cave
Cave Popcorn in Wind Cave
Cave Popcorn in Wind Cave

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Image: Cave Formations in Wind Cave
Cave Formations in Wind Cave
Cave Formations in Wind Cave
Cave Formations in Wind Cave

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Wind Cave is the first cave national park and currently, the 6th most extensive cave network in the world. It's most famous for its large concentration of a fairly rare cave formation known as boxwork. Boxwork is formed when dissolved calcium carbonate crystallized in cracks in surrounding rock.

Image: Flowstone Formations in Jewel Cave
Flowstone Formations in Jewel Cave
Flowstone Formations in Jewel Cave
Flowstone Formations in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

Image: Cave Bacon in Jewel Cave
Cave Bacon in Jewel Cave
Cave Bacon in Jewel Cave
Cave Bacon in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of the image, a formation known as cave bacon can be seen.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of the image, a formation known as cave bacon can be seen.

Image: Boxwork in Jewel Cave
Boxwork in Jewel Cave
Boxwork in Jewel Cave
Boxwork in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

Image: Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of the image, some of this coating of calcite crystals can be seen. These crystals are made up of two primary types: dogtooth spar and nailhead spar.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of the image, some of this coating of calcite crystals can be seen. These crystals are made up of two primary types: dogtooth spar and nailhead spar.

Image: Cross-section of Calcite Crystal Covering in Jewel Cave
Cross-section of Calcite Crystal Covering in Jewel Cave
Cross-section of Calcite Crystal Covering in Jewel Cave
Cross-section of Calcite Crystal Covering in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

A cross-sectional view of the crystal coating can be seen in the center of the image, with the surface of the calcite crystals at the top of the image.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

A cross-sectional view of the crystal coating can be seen in the center of the image, with the surface of the calcite crystals at the top of the image.

Image: Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of the image, some of this coating of calcite crystals can be seen. These crystals are made up of two primary types: dogtooth spar and nailhead spar.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of the image, some of this coating of calcite crystals can be seen. These crystals are made up of two primary types: dogtooth spar and nailhead spar.

Image: Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

On the righthand side of the image, some of this coating of calcite crystals can be seen. These crystals are made up of two primary types: dogtooth spar and nailhead spar.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

On the righthand side of the image, some of this coating of calcite crystals can be seen. These crystals are made up of two primary types: dogtooth spar and nailhead spar.

Image: Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave
Dogtooth and Nailhead Spar in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of the image, some of this coating of calcite crystals can be seen. These crystals are made up of two primary types: dogtooth spar and nailhead spar.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of the image, some of this coating of calcite crystals can be seen. These crystals are made up of two primary types: dogtooth spar and nailhead spar.

Image: Mule Ear Drapery in Jewel Cave
Mule Ear Drapery in Jewel Cave
Mule Ear Drapery in Jewel Cave
Mule Ear Drapery in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of this image, a cave formation known as mule-ear drapery can be seen.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

In the center of this image, a cave formation known as mule-ear drapery can be seen.

Image: An Iron Deposit in Jewel Cave
An Iron Deposit in Jewel Cave
An Iron Deposit in Jewel Cave
An Iron Deposit in Jewel Cave

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

Jewel Cave is currently the 3rd most extensive cave network in the world. It is believed to have formed completely underwater, thus leading to the extensive coating of calcite crystals.

Image: Plague Vaccine Bait
Plague Vaccine Bait
Plague Vaccine Bait
Plague Vaccine Bait

The USGS developed an oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague. The SPV is administered via a brightly colored, peanut butter flavored bait.

The USGS developed an oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague. The SPV is administered via a brightly colored, peanut butter flavored bait.

Image: Wild Prairie Dog
Wild Prairie Dog
Wild Prairie Dog
Wild Prairie Dog

A prairie dog sits outside its burrow at the Pitchfork Ranch near Meteetsee, Wyoming.

A prairie dog sits outside its burrow at the Pitchfork Ranch near Meteetsee, Wyoming.

Image: Tagged Prairie Dog
Tagged Prairie Dog
Tagged Prairie Dog
Tagged Prairie Dog

This wild prairie dog has been tagged by scientists in an effort to study the efficacy of a USGS-developed oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague.

This wild prairie dog has been tagged by scientists in an effort to study the efficacy of a USGS-developed oral sylvatic plague vaccine (SPV) to help immunize prairie dogs against plague.

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