Dick and Mardy Zimmerman kindly provided some of the original full sized material to photograph for further investigation. On the adjacent ridge, where we found extensive beds of stromatolites, and three mining tunnels were found into the Mescal Limestone. The tailings indicated that hundreds of feet into the ridge, they first encountered the paleo karst Terra Rosa material, then several beds of hematite. The occurrence is located about 75 feet above the floor of a valley next to a dry wash. They are typically 3 to 6 inches long, and are densely packed.
Some tubes extend into the lower half of the chert bed as well.
They do not seem connected to them in any way. On the adjacent ridge, just above the same green chert zone, we found abundant calcified stromatolites. Images from our Expedition Click on the image label for an enlarged view. Image 1 Parked at the base of the ridge with the outcrop on the extreme left, and just above center in this picture. Note the dip of the Mescal on the right of the ridge.