A few weeks ago I volunteered to help Bernie Taylor, a fellow member of Rose City Astronomers, to investigate whether the so-called “Hancock Woman” pictograph out near Fossil, Oregon might be a solar calendar.
Bernie wrote the book Biological Time and he was kind enough to give me a copy. I have only had time to skim it heavily at this point but I highly recommend it to anyone interested in biological rhythms and the way animal behavior changes during lunar and solar cycles in nature.