La Brea Tar Pit Riker Box Specimens
La Brea Tar Pit Riker Box Specimens
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Above: The front of the Specimen Card for the Tar Pit Specimen. (Source: Smilodon californicus and Canis dirus fight over a Mammuthus columbi carcass in the La Brea Tar Pits, Robert Bruce Horsfall, 1913)
The La Brea Tar Pits are among the most well-known petroleum seeps in the world. Over millennia, such seeps can become lake-like formations and trap unwary wildlife. Excavated animal remains at La Brea comprise nearly 700 different species, some dating back 40,000 years to the Late Pleistocene.

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