Not solid rock Bill, but a conglomerate of rock, gravel and coarse sand, cemented by caliche.
If you're talking about the QC/US 60 spot ?
But the Black Point "Punta Negro" spot on the map Frank had posted some time ago, likely has similar geology.
And that's where I'll agree that the small maps were found.
It's hard, and not exactly "shovel ready" , but can be broken up with a pick and then shoveled or scraped out.
You must have noticed the piles of rock and dirt all around the holes when you were out there, didn't you ?
Those piles were very close to the edges of the holes, unlike what a backhoe operator would do, or any kind of blasting.
So they were dug by hand, and whatever was put in the holes originally is now long gone.
There was a nice black heart that I kicked out of the rubble pile last October.
View attachment N S hole.bmp
BTW: There are some layers of limestone/tuffa/sandstone visible along the old creek bank below.
About 20-30 ft. down from the top of the eroded cliff. So that's about how far down you would have to dig, before you hit any kind of bedrock.
BTWW: Also came across some "junk" you and all the others must have missed...or maybe dropped out there.
At the base of this saguaro, and in it's 11:00 shadow, there was an unusual marker which pointed towards BP.
Probably pointed at some treasure before someone else got into it. But it had the glint of gold, so I went and had a looksee anyway.
Left it there though, since it obviously wasn't meant for me.
Left the black heart by the hole in the other photo as well.
View attachment Lopped saguaro wi gold junk.bmp