ah, here we go... some mammoths and mastodons, but mostly other stuff so far:
http://www.tarpits.org/research/pit91/pitfacts.html
The most common animal fossils that have been excavated from the La Brea Tar Pits are dire wolves (more than 3,000 found) and California's official state fossil, the saber-toothed cat (more than 2,000 found). Other fossils include mammoths and mastodons, ground sloths, camel, short-faced bears, horses, bison and birds. Since Page Museum paleontologists and volunteers began excavating Pit 91 in 1915, more than 250,000 fossils have been recovered. Over 650 different species of animals and plants have been recovered from the tar pits. Of these, most of the fossil plants, insects, snails and small mammals have come from Pit 91.
http://www.tarpits.org/research/mamtooth.html
Mammoth Tooth Replacement
Mammoths, like elephants, grew their teeth in a process much like a conveyor belt. As one tooth was being used and worn, the next was forming and was ready when needed, right behind the one being used. In the case of this fossil from a Columbian mammoth (Mammuthus columbi) discovered in Pit 9, one can easily see the replacement tooth still forming in the jaw behind the existing tooth.
http://www.paleodirect.com/lm8-009.htm
"Truly HIGH quality mammoth tusks from the North Sea are infinitely more rare than mammoth tusks from the Siberian tundra (Russia). Most North Sea mammoth fossils are so badly eaten up and rotted by the harsh elements of the salt water. They exist on and below the ocean floor and are often accidentally brought up in fishing nets, sustaining even further damage and breakage. On the contrary, mammoth fossils in Russia, like most Pleistocene Russian fossils, are found in the ground in massive bone beds that extend for considerable distances. These fossils are blasted out of the tundra with water cannons and so many are found that woolly mammoth tusks are a commodity and sold by the pound at fossil shows! The nature of their burial and method in which they are extracted has produced vast quantities of exceptionally preserved woolly mammoth teeth, bones, tusks, etc. so much so, that it seems like supply is inexhaustible with each year bringing a greater flood of these Russian specimens."