Chapter eight discusses dating methods and how we look at the past.
Your Hunt and Gather assignment is to find something you can relatively date or shows the passage of time, and how it can be utilized in research.
For example, I have had past students take pictures of two houses and explain how architectures have changed, why you can tell one house is older than the other, and what it would mean to an anthropologist.
There are a lot of examples of dating techniques in your book. See if you can use some of them.
Make sure you explain your post in a paragraph or more.