I was actually exploring the many slots canyon of Palm Wash in the vicinity of the Calcite Mine road but it's also listed under this hike in the book. According to some beta online, many of these canyons on the SE side of the Santa Rosas have slotty narrows sections.
Started by hiking up the South Wash a fair ways up passing thru a couple sweet narrow sections before climbing the ridge and finding a sane way to drop into the slot of the middle fork.
The rock in here is very crumbly and you can't trust any of it with you life...
The brief slot section of this middle fork had 100-200ft tall walls and is probably one of the best in the area. Kept working my way north and hit the mine road and the mine area and found a sane way into the narrows of the North Fork. The way downstream was quickly stopped by a 35ft dryfall so I headed back upstream a fair ways until the canyon widened up. Headed back and up to the mine and saw a cool butte to climb and get a good windy overlook of the area and Salton Sea to the east. 4x4 vehicles were clogging up the mine road, so I dropped down another middle fork and made my way down that finding a couple more cool narrow sections before it hit the larger lower North fork and made my way back to the mine road and back out to the highway. Wow, what a sweet collection of narrow canyons! There's prob many more in the area to be found but I think I got my fill for the day.