For tens of thousands of years, the warm, sticky natural asphalt that occasionally bubbled to the Earth’s surface in the area now called Los Angeles was a death sentence for some ice age animals. Woolly mammoths, camels, rabbits, horses, bison, sloths, rodents, snails, turtles, birds and saber-toothed cats perished after becoming mired in the liquid read more Gill examines plants encased in tar pits to reconstruct ice age ecosystem