I found a petrified not from digging. It seems to be like a rock but im not sure where to turn it in? I also saw one person have another artifact so i think theres multiple objects to get.
:0 ok, i figured it out. If you find an artifact, hold it up to that guy that says to dig. He'll go to the place where you found your artifact, so go back there. He then will give you the translation notes so you can talk to the native people. I'm not sure if you need to turn in the book, but as long as you have it, you may but furnitures and interact with the native people, etc.