There actually aren't tar pits on Wilshire Blvd. 
They are called tar pits, the La Brea Tar Pits, but in fact they are asphalt pits or "seeps". Tar is a man-made commercial by-product. Asphalt is a naturally formed substance.
There are asphalt pits bubbling up along Wilshire Blvd. It's pretty amazing, especially among the office buildings and self absorbed hubbub of downtown LA. The pits contain millions of bones from creatures and plant skeletons from the last Ice Age and the asphalt itself is the gooey remains of ancient sea life that flourished when the Los Angeles Basin was still submerged in the sea.
A sad scene that plays out on this exact spot to this very day.
In geologic time we are currently 65 million years into the Cenozoic Era but the asphalt didn't start sucking in its victims until a mere 40,000 years ago. I didn't know all this until today when we visited the La Brea Tar Pits but it helps put things in perspective, especially with so many fundamentalist wanks doing everything they can to usher in their pet version of the End Times.
The La Brea excavation site is well worth a visit. Definitely put visiting them on your short list.
Unfortunately, it appears that we are its most current victims.
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