After leaving Lincoln City, Dana and I came inland on OR Route 18, and headed to Erratic Rock Wayside. The parking and pathway from Oldsville Road are easy to miss- I've driven by at least once each time I've visited the spot, and this time was no exception. Hopefully, with the FlashEarth location and modern deally-boppers such as GPS, along with landmarks and cues I'll point out over the next few days, others will have an easier time with it.
A note about interpretive signs: take them with a grain of salt. I don't know who is responsible for designing them and writing them up. They aren't necessarily wrong- I see no outright errors in the one above. But neither are they authoritative. It's not at all uncommon to find misinformation and mistakes on them. I'm mightily glad I live in a place that cares enough to more-or-less permanently make this information available to the public, but for those who find it interesting, whether the sign is interpreting a natural or historical site, such information should be taken as jumping-off point, a start, and an impetus to find more thorough- and likely more accurate and complete- sources.