Tim,
Thanks for posting on the blog. Good Stuff! I found that same map online and decided to go exploring and figured I'd 4x4 on the trail from Graveyard Point to Succor Creek. Just a word of caution, it's little more than an ATV trail. Although decent 4x4 can manage the whole way, once you get in to Succor Creek canyon, when you get toward the bottom the trail is washed out by a tributary creek. I went literally through the creek down a steep grade about 100 yards with a lot of big rocks and deep ravines. There was no going back up in my vehicle. When I got to the bottom, the bridge over succor creek at the big X on the map is actually a foot bridge less than 6 ft wide. Luckily I was barely able to cross it but not without scratching up my fenders on the sides of the bridge and getting a lot of stares from the campers there.
On the plus side, there's still lots of nice Plume Agate around Graveyard Point and found some interesting Jasper and petrified wood on a gravel bar in Succor Creek.