The GPS coordinates shown (40 42.06.96 / 79 59.42.19) prior to finding the time machine are for a wooded area outside of Mars, PA. This nowhere near NYC.
Carmine says that ". . They had the elephant carbon dated . . . We're looking at a four million year-old mastodon." The maximum age that can be determined by radioactive carbon dating is 10,000 years. Beyond an age of 5,000 years, the results become erratic.
They use a saw to separate the two hemispheres of a brain to expose a needle that joined the two above the corpus collosum which is the part that joins the two.