Various studies have been done on the ancient vegetation found at or near T.rex sites. One study was done comparing the plant life at the "Sue" find, the largest T.rex skeleton uncovered, found in 1990 by Susan Hendrickson in western South Dakota. The second site was the "Stan" skeleton found by Stan Sarcrison in South Dakota. At the Stan site it was found that the plant life consisted of mostly flowering plants and less than ten percent conifer plants. The conifer species that were found only exist today in the southern hemisphere, and include species like the Monkey Puzzle tree.