La Brea Tar Pits

La Brea Tar Pits are a group of tar pits around which Hancock Park was formed in urban Los Angeles. Natural asphalt (also called asphaltum, bitumen, pitch, or tar—brea in Spanish) has seeped up from the ground in this area for tens of thousands of years. The tar is often covered with dust, leaves, or water. Over many centuries, the tar preserved the bones of trapped animals. The George C. Page Museum is dedicated to researching the tar pits and displaying specimens from the animals that died there. La Brea Tar Pits is a registered National Natural Landmark. The tar pits were also referenced in a Weezer song of the same name.[2]

For the tar pit in La Brea, Trinidad and Tobago, see Pitch Lake.

La Brea Tar Pits
Gas bubble slowly emerging at La Brea Tar Pits
Location in Los Angeles
LocationHancock Park, Los Angeles
Coordinates34°03′46″N 118°21′22″W
Official nameHancock Park La Brea[1]
Reference no.170
Designated1964
Illustration of several species getting mired in the tar pits

Formation

Tar pits are composed of heavy oil fractions called gilsonite, which seeps from the Earth as oil. In Hancock Park, crude oil seeps up along the 6th Street Fault from the Salt Lake Oil Field, which underlies much of the Fairfax District north of the park.[3] The oil reaches the surface and forms pools, becoming asphalt as the lighter fractions of the petroleum biodegrade or evaporate. The asphalt then normally hardens into stubby mounds. The pools and mounds can be seen in several areas of the park.

La Brea Tar Pits display of mammoths trapped in tar

The tar pits visible now were all created by human excavations: the lake pit was originally an asphalt mine; and the other visible pits were produced as a result of explorers excavating more than 100 sites between 1913 and 1915 in search of large mammal bones. (Since then, these excavations have gradually been filled in by an accumulation of asphaltum, dust, leaves, and water, but the tar pits they produced remain.)

This seepage has been happening for tens of thousands of years, during which the asphalt sometimes formed a deposit thick enough to trap animals. The deposit would become covered over with water, dust, or leaves. Animals would wander in, become trapped, and die. Predators would enter to eat the trapped animals and would also become stuck. As the bones of a dead animal sink, the asphalt soaks into them, turning them dark-brown or black in color. Lighter fractions of petroleum evaporate from the asphalt, leaving a more solid substance, which then encases the bones. Dramatic fossils of large mammals have been extricated from the tar, but the asphalt also preserves microfossils: wood and plant remnants, rodent bones, insects, mollusks, dust, seeds, leaves, and even pollen grains. Examples of some of these are on display in the George C. Page Museum. Radiometric dating of preserved wood and bones has given an age of 38,000 years for the oldest known material from the La Brea seeps. The pits still ensnare organisms today, so most of the pits are fenced to protect humans and animals.

History
The Tar Pits in 1910. Oil derricks can be seen in the background.

The Native American Chumash and Tongva people living in the area built boats unlike any others in North America prior to contact by settlers. Pulling fallen Northern California redwood trunks and pieces of driftwood from the Santa Barbara Channel, their ancestors learned to seal the cracks between the boards of the large wooden plank canoes by using the natural resource of tar. This innovative form of transportation allowed access up and down the coastline and to the Channel Islands. The Portolá expedition, a group of Spanish explorers led by Gaspar de Portolá, made the first written record of the tar pits in 1769. Father Juan Crespí wrote,

While crossing the basin, the scouts reported having seen some geysers of tar issuing from the ground like springs; it boils up molten, and the water runs to one side and the tar to the other. The scouts reported that they had come across many of these springs and had seen large swamps of them, enough, they said, to caulk many vessels. We were not so lucky ourselves as to see these tar geysers, much though we wished it; as it was some distance out of the way we were to take, the Governor [Portolá] did not want us to go past them. We christened them Los Volcanes de Brea [the Tar Volcanoes].[4]

Harrison Rogers, who accompanied Jedediah Smith on his 1826 expedition to California, was shown a piece of the solidified asphalt while at Mission San Gabriel, and noted in his journal, "The Citizens of the Country make great use of it to pitch the roofs of their houses".[5] The La Brea Tar Pits and Hancock Park are situated within what was once the Mexican land grant of Rancho La Brea, now part of urban Los Angeles in the Miracle Mile district. For some years, tar-covered bones were found on the Rancho La Brea property, but were not initially recognized as fossils because the ranch had lost various animals–including horses, cattle, dogs, and even camels–whose bones closely resemble several of the fossil species. The original Rancho La Brea land grant stipulated that the tar pits be open to the public for the use of the local Pueblo. Initially, they mistook the bones in the pits for the remains of pronghorn (Antilocapra americana) or cattle that had become mired.

Union Oil geologist W. W. Orcutt is credited, in 1901, with first recognizing that fossilized prehistoric animal bones were preserved in pools of asphalt on the Hancock Ranch. In commemoration of Orcutt's initial discovery, paleontologists named the La Brea coyote (Canis latrans orcutti) in his honor.[6]

Scientific resource
Columbian mammoth skeleton from the tar pits, displayed in the George C. Page Museum

Contemporary excavations of the bones started in 1913–1915. In the 1940s and 1950s, public excitement was generated by the preparation of previously recovered large mammal bones.[7] A subsequent study demonstrated the fossil vertebrate material was well preserved, with little evidence of bacterial degradation of bone protein.[8] They are believed to be some 10–20,000 years old, dating from the last glacial period.[9]

Bacteria

Methane gas escapes from the tar pits, causing bubbles that make the asphalt appear to boil. Asphalt and methane appear under surrounding buildings and require special operations for removal to prevent the weakening of building foundations. In 2007, researchers from UC Riverside discovered that the bubbles were caused by hardy forms of bacteria embedded in the natural asphalt. After consuming petroleum, the bacteria release methane. Around 200 to 300 species of bacteria were newly discovered here.[10]

George C. Page Museum
The La Brea Tar Pits Museum in Hancock Park

The George C. Page Museum of La Brea Discoveries, part of the Natural History Museum of Los Angeles County, was built next to the tar pits in Hancock Park on Wilshire Boulevard. Construction began in 1975, and the museum opened to the public in 1977.[11]

However, the history of the fossil museum began in 1913, when George Allan Hancock, the owner of Rancho La Brea, granted the Natural History Museum of Los Angeles County exclusive excavation rights at the Tar Pits for two years. In those two years, the museum was able to extract 750,000 specimens at 96 sites, guaranteeing that a large collection of fossils would remain consolidated and available to the community.[12] Then in 1924, Hancock donated 23 acres to LA County with the stipulation that the county provide for the preservation of the park and the exhibition of fossils found there.[12]

The museum tells the story of the tar pits and presents specimens excavated from them. Visitors can walk around the park and see the tar pits. On the grounds of the park are life-sized models of prehistoric animals in or near the tar pits. Of more than 100 pits, only Pit 91 is still regularly excavated by researchers and can be seen at the Pit 91 viewing station. In addition to Pit 91, the one other ongoing excavation is called "Project 23". Paleontologists supervise and direct the work of volunteers at both sites.[13]

Excavation of "Project 23" and newly uncovered pits

On February 18, 2009, George C. Page Museum formally announced the 2006 discovery of 16 fossil deposits that had been removed from the ground during the construction of an underground parking garage for the Los Angeles County Museum of Art next to the tar pits.[14] Among the finds are remains of a saber-toothed cat, dire wolves, bison, horses, a giant ground sloth, turtles, snails, clams, millipedes, fish, gophers, and an American lion.[14][15] Also discovered is a nearly intact mammoth skeleton, nicknamed Zed; the only pieces missing are a rear leg, a vertebra, and the top of its skull, which was sheared off by construction equipment in preparation to build the parking structure.[15][16][17]

These fossils were packaged in boxes at the construction site and moved to a compound behind Pit 91, on Page Museum property, so that construction could continue. Twenty-three large accumulations of tar and specimens were taken to the Page Museum. These deposits are worked on under the name "Project 23". As work for the public transit D Line is extended, museum researchers know more tar pits will be uncovered, for example near the intersection of Wilshire and Curson.[14] In an exploratory subway dig in 2014 on the Miracle Mile, prehistoric objects unearthed included geoducks, sand dollars, and a 10-foot limb from a pine tree, of a type now found in Central California's woodlands.[18]

Flora and fauna
Further information: List of fossil species in the La Brea Tar Pits
La Brea Tar Pits fauna as depicted by Charles R. Knight

Among the prehistoric species associated with the La Brea Tar Pits are Pleistocene mammoths, dire wolves, short-faced bears, American lions, ground sloths, and, the state fossil of California, the saber-toothed cat (Smilodon fatalis).

The park is known for producing myriad mammal fossils dating from the last glacial period. While mammal fossils generate significant interest, other fossils, including fossilized insects and plants, and even pollen grains, are also valued. These fossils help define a picture of what is thought to have been a cooler, moister climate in the Los Angeles basin during the glacial age. Among these fossils are microfossils, which are retrieved from a matrix of asphalt and sandy clay by washing with a solvent to remove the petroleum, then picking through the remains under a high-powered lens.

Tar and wild flower run within La Brea campus

Tar pits around the world are unusual in accumulating more predators than prey. The reason for this is unknown, but one theory is that a large prey animal would die or become stuck in a tar pit, attracting predators across long distances. This predator trap would catch predators along with their prey. Another theory is that dire wolves and their prey may have been trapped during a hunt. Since modern wolves hunt in packs, each prey animal could take several wolves with it. The same may be true of saber-toothed cats known from the area.

Human presence

Only one human has been found, a partial skeleton of the La Brea Woman[19] dated to around 10,000 calendar years (about 9,000 radiocarbon years) BP,[20] who was 17 to 25 years old at death[21] and found associated with remains of a domestic dog, so was interpreted to have been ceremonially interred.[22] Nevertheless, later, in 2016, the dog was determined to be much younger in date.[23]

John C. Merriam of the University of California led much of the original work in this area early in the 1900s.

Also, some even older fossils showed possible tool marks, indicating humans active in the area at the time. Saber-toothed cat bones from La Brea showing signs of ‘artificial’ cut marks at oblique angles to the long axis of each bone were radiocarbon dated to 15,200 ± 800 B.P. (uncalibrated).[24]

If these cuts are in fact tool marks resultant from butchering activities, then this material would provide the earliest solid evidence for human association with the Los Angeles Basin. Yet it is also possible that there was some residual contamination of the material as a result of saturation by asphaltum, influencing the radiocarbon dates.[25]

See also
  •  Los Angeles portal
  •  Paleontology portal

References
  1. "Hancock Park". Office of Historic Preservation, California State Parks. Retrieved October 7, 2012.
  2. "La Brea Tar Pits". YouTube.
  3. Khilyuk, Leonid F.; Chilingar, George V. (2000). Gas migration: events preceding earthquakes. Gulf Professional Publishing. p. 389. ISBN 0-88415-430-0.
  4. Kielbasa, John R. (1998). "Rancho La Brea". Historic Adobes of Los Angeles County. Pittsburg: Dorrance Publishing Co. ISBN 0-8059-4172-X..
  5. Smith, J. S., & Brooks, G. R. (1977). The Southwest expedition of Jedediah S. Smith: His personal account of the journey to California, 1826–1827. Glendale, Calif: A. H. Clark, p. 239. ISBN 0-8706-2123-8
  6. "Horticulture Centers and Gardens | City of Los Angeles Department of Recreation and Parks". www.laparks.org. Retrieved June 20, 2020.
  7. "Animal Bones 50,000 Years Old Found In Tar". Los Angeles Times. Los Angeles. June 17, 1946. Retrieved January 27, 2010.
  8. McMenamin, M.A.S.; et al. (1982). "Amino acid geochemistry of fossil bones from the Rancho La Brea Asphalt Deposit, California". Quaternary Research. 18 (2): 174–83. Bibcode:1982QuRes..18..174M. doi:10.1016/0033-5894(82)90068-0.
  9. Ley, Willy (December 1963). "The Names of the Constellations". For Your Information. Galaxy Science Fiction. pp. 90–99.
  10. Jia-Rui Chong, "Researchers learn why tar pits are bubbly", Los Angeles Times, May 14, 2007.
  11. Page Museum. "About the museum". Page Museum web site. The Natural History Museum of Los Angeles County Foundation. Retrieved January 25, 2016.
  12. "La Brea Tar Pits History | La Brea Tar Pits". tarpits.org. Retrieved June 20, 2020.
  13. Page Museum. "Page Museum—La Brea Tar Pits". Page Museum web site. The Natural History Museum of Los Angeles County Foundation. Retrieved December 15, 2006.
  14. "Cache Of Ice Age Fossils Found Near Tar Pits". Los Angeles: KCBS-TV. Associated Press. February 18, 2009. Archived from the original on February 20, 2009. Retrieved February 18, 2009.
  15. Thomas H. Maugh II (February 18, 2009). "Major cache of fossils unearthed in L.A." Los Angeles Times. Los Angeles. Retrieved February 18, 2009.
  16. "Workers Unearth Mammoth Discovery near La Brea Tar Pits". Los Angeles: KTLA. February 18, 2009. Retrieved February 18, 2009.
  17. "Nearly intact mammoth found at L.A. construction site". USA Today. February 18, 2009. Retrieved September 1, 2010.
  18. Malkin, Bonnie (March 7, 2014). "Prehistoric objects unearthed in LA subway dig". The Telegraph (UK). AP. Retrieved March 18, 2014.
  19. J.C. Merriam (1914) Preliminary report on the discovery of human remains in an asphalt deposit at Rancho La Brea, Science 40: 197–203
  20. F.R. O'Keefe, E.V. Fet, and J.M. Harris (2009) Compilation, calibration, and synthesis of faunal and floral radiocarbon dates, Rancho La Brea, California, Contributions in Science 518: 1–16
  21. G.E. Kennedy (1989) A note on the ontogenetic age of the Rancho La Brea hominid, Los Angeles, California, Bulletin, Southern California Academy of Sciences 88(3): 123–26
  22. R.L. Reynolds (1985) Domestic dog associated with human remains at Rancho La Brea, Bulletin, Southern California Academy of Sciences 84(2): 76–85
  23. Fuller, Benjamin T.; Southon, John R.; Fahrni, Simon M.; Harris, John M.; Farrell, Aisling B.; Takeuchi, Gary T.; Nehlich, Olaf; Richards, Michael P.; Guiry, Eric J.; Taylor, R. E. (2016). "Tar Trap: No Evidence of Domestic Dog Burial with "La Brea Woman"". PaleoAmerica. 2: 56–59. doi:10.1179/2055557115Y.0000000011. S2CID 130862425.
  24. Moratto, M. 1984. California Archaeology. Florida: Academic Press, p.54
  25. Technical report for power plant construction. CULTURAL RESOURCES. California Energy Commission, Sacramento, California, December 2000
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