They will use some science in order to figure out when did this skull enter into the ground? They might use a technique like radiocarbon dating. Radiocarbon dating. Which could be used for things up to around 50,000 years old. So around that time span on our timeline. And it's based on this idea that you have this atmospheric carbon-14 that actually comes from nitrogen-14 that gets between interactions with the solar wind and these cosmic particles becomes this radioactive carbon-14 and that carbon-14, which can become part of carbon dioxide, incorporated into plants through photosynthesis, which then get eaten into animals. So while something is living, they will have a certain amount of carbon-14 in their tissue.