Lava Beds National Monument
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Lava Beds National Monument, located in Siskiyou and Modoc Counies, California, is the site of the largest concentration of lava tube caves in the United States. It was established as a United States National Monument on November 21, 1925.
The monument lies on the northeast flank of the Medicine Lake shield volcano, the largest volcano (total area covered) in the Cascade Range. The region in and around the monument is unique because it lies on the junction of the Sierra-Klamath, Cascade, and Great Basin physiographic provinces. In addition, the monument is geologically outstanding because of its great variety of "textbook" volcanic formations; i.e., lava tube caves, fumaroles, cinder cones, spatter cones, maar volcanoes, and lava flows. Over 30 separate lava flows located in the park range in age from 2,000,000 years BP to 1,110 years BP. Some of the major Lava Flows within Lava Beds National Monument include: Callahan Flow, Schonchin Flow, Mammoth Crater Flow, Modoc Crater Flow, and Devils Homestead Flow. Schonchin Butte is an example of a cinder cone.
The high elevation, semi-arid desert environment of Lava Beds receives an average of 15 inches (381 mm) of annual precipitation. The climate is characterized by warm, dry summers and cold winters. The average annual high temperature is 60° F (16 C) and average annual low temperature is 35° F (2 C). Temperature extremes range from 18° F ( -28 C) to 102° F (39 C). Average annual snowfall is 44 inches (1118 mm). The lava tube collapse systems and lava outcrops support a great diversity of plant life, from an impressive variety of lichens and mosses to plants such as desert sweet (Chamaebatiaria millefolium) and the aromatic desert (purple) sage (Salvia dorrii carnosa). An impressive variety of fern species are present in cave entrances including the spreading wood fern (Dryopteris expansa) and the western swordfern (Polystichum munitum). These species are well outside of their normal range 90 - 125 miles away on the northern California coastline.
Volcanic eruptions on the Medicine Lake shield volcano have created an incredibly rugged landscape punctuated by cinder cones, lava flows, spatter cones, lava tube caves and pit craters. During the Modoc War of 1872-1873, the Modoc Indians used these tortuous lava flows to their advantage. Under the leadership of Captain Jack, the Modocs took refuge in "Captain Jack's Stronghold," a natural lava fortress. From this base a group of 53 fighting men and their families held off US Army forces numbering up to ten times their strength for five months. Gen E. R. S. Canby was killed here by Captain Jack at a peace meeting on April 11, 1873.
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Wildlife
Despite harsh, semi-arid conditions, native wildlife has adapted to the environmental constraints present in the region. There are no terrestrial water resources in Lava Beds National Monument. Some animals obtain water from caves, while others fly about twenty miles (12 km) north to Tule Lake. Federal and state animal species of special concern in the monument include: Cooper's Hawk (Accipiter cooperii), Fringed Myotis (Myotis thysanodes), Long-eared Myotis (Myotis evotic), Long-legged Myotis (Myotis volans), Pallid Bat (Antrozous pallidus), Silver-haired Bat (Lasionycteris noctivigans), Townsends Big-eared Bat (Corynorhinus townsendii), Western Small-footed Myotis (Myotis ciliolabrum), and American Badger (Taxidea taxus).
Because of a lack of surface water, amphibian presence in the monument is limited. The most common species found in the monument is the pacific tree frog (Hyla regilla). This species is also found in the biologically rich cave entrances in the monument. Reptile species found in the monument include: Northern Sagebrush Lizard (Sceloporus graciosus graciosus), Great Basin Fence Lizard (Sceloporus occidentalis biseriatus), Western Skink (Eumeces skiltonianus skiltonianus), Rocky Mountain Rubber Boa (Charina bottae utahensis), Gopher Snake (Pituophis melanoleucus), Desert Night Snake (Hypsiglena torquata deserticola), Western Rattlesnake (Crotalis virdis).
Key animal species by habitat:
- Bunchgrass-sagebrush grasslands: Mule Deer, Coyote Gopher Snake, Prairie Falcon, Western Meadowlark, Anderson Larkspur, Yellow-bellied Marmot, Kangaroo Rat
- Porcupine juniper-brushlands: Pronghorn Antelope, Bobcat, Scrub Jay, Jackrabbit, Mountain Bluebird,
- Pine forest: Mountain Lion, Bald Eagle (winter resident), Golden-mantled Ground Squirrel, Rocky Lava Flows: Western Fence Lizard, Western Rattlesnake
- Cave mouths & interior passages: Violet-green Swallow, Brazilian Free-tailed Bat, Townsends Big-eared Bat, Pacific Tree Frog, Pika, Bushy-tailed Woodrat
- Lake shore areas: Skunk, Raccoon, Great Horned Owl, Short-eared Owl.
Geologic formations
Roughly ninety percent of the lava in the monument is basaltic. There are primarily two kinds of basaltic lava flows: pahoehoe and aa. Pahoehoe is smooth and ropy and is the type most common in Lava Beds. Aa is formed when pahoehoe cools and loses some of its gases. Aa is rough, sharp, and jagged; an excellent example is the Devils Homestead lava flow, which originated at Fleener Chimneys. Most of the rest of the lava in the monument is andesitic. Pumice, a type of rhyolitic lava, also is found covering the monument; this rained down around 900 years ago during the eruption of Glass Mountain.
The flows from Mammoth and Modoc Craters comprise about 2/3 of the lava in the monument. These flows have been dated to about 30,000-40,000 years ago; most of the caves in the monument were formed from these flows. As the hot basaltic lava flowed downhill, the top cooled and crusted over, insulating the rest of the lava and forming lava tubes. Lavacicles were formed when lava splashed up on the ceiling of the tube and dripped back down as it cooled. Dripstone was created when lava splashed on the inside walls of the tubes.
Cinder cones are formed when magma is under great pressure. It is released in a fountain of lava, blown into the air from a central vent. The lava cools as it falls, forming cinders that pile up around the vent. When the pressure has been relieved, the rest of the lava flows from the base of the cone. Cinder cones typically only erupt once.
The cinder cones of Hippo Butte, Three Sisters, Juniper Butte, and Crescent Butte are all older than the Mammoth and Modoc Crater flows (that is, more than 30,000-40,000 years old). Eagle Nest Butte and Bearpaw Butte are 114,000 years old. Schonchin Butte and the andesitic flow from its base were formed around 62,000 years ago. The flow that formed Valentine Cave erupted 10,850 years ago. An eruption that formed The Castles is younger than the Mammoth Crater flows. Even younger were eruptions from Fleener Chimneys (the Devils Homestead flow, 10,500 years ago) and Black Crater (3,025 years ago). About 1,110 years ago, plus or minus 60 years, the Callahan flow was produced by an eruption from Cinder Butte. Though Cinder Butte is just outside the boundary of the monument, the Callahan flow is in Lava Beds and is the youngest flow in the monument.
Spatter cones are built out of thicker lava. The lava is thrown out of the vent and builds, layer by layer, a chimney surrounding the vent. Fleener Chimneys and Black Crater are examples of spatter cones.
Gillem Bluff, a fault scarp, was created as the region stretched and a block of earth dropped down along this fault (see Basin and Range Province). The tuff layer on top of Gillem Bluff is 2,000,000 years old, inferring the rock layers beneath are even older. The oldest lava flow from the Medicine Lake Volcano within the monument is the Basalt of Hovey Point, near Captain Jacks Stronghold, which is 450,000 years old. Petroglyph Point was created about 275,000 years ago when cinders erupted through the shallow water of Tule Lake; violent explosions of ash and steam formed layers upon layers of tuff.
Recent activity
A series of small earthquakes in late 1988 has been attributed to subsidence in the caldera.
N-NE trending ground cracks, as well as N-NE trending vent series show relationships between tectonism and volcanism. One very prevalent ground crack exists along the northeastern boundary of the monument- "The Big Crack."
The leaching of minerals from pumice gravel, soils, and overlying rock provides for deposition of secondary speleothems in lava tubes.
External links
- National Park Service: Lava Beds National Monument (http://www.nps.gov/labe/index.htm) (adapted public domain text)
- Lava Beds National Monument (http://www.nationalparksgallery.com/parks/Lava-Beds-National-Monument) - National Parks Gallery