When you drive Pacific Coast Highway or the 101, there are signs that designate the separation of Los Angeles and Ventura Counties. There is no such sign on Little Sycamore Canyon Road. However, as you drive up the road toward the posted coordinates, it is VERY CLEAR where the separation is....you can even see it in Google Earth.
There is a bison tube tied outside a post at this location. Unscrew the bottom to get to the log, then fit the log onto the top when replacing.