The Rainbow Basin's foundation was formed long ago when the area was under water. Over time, layer upon layer of sediment blanketed the ocean floor that eventually turned into a lush marshy swamp. Animals of the Miocene period on earth lived and died here, including Sabre Tooth cats, Mastadons, camels , ground sloths. As layers of sediment covered them, it preserved the bones which eventually turned into fossils. (DUSA has published articles on the Rainbow basin/ Mud Hills region.
http://www.desertusa.com/mag02/may/rainbow.html)
Then came the faulting and tectonic plate drifting which slowly raised the limestone base creating a multicolored snapshot
of the Miocene period of the earth's history. It's spectacular beauty is reason enough for a visit however, we decided to set up a base camp nearby in Owl Canyon, which holds more of the same geology. The BLM has a campground there and the cost is $6 a night. Although it is legal to camp for free and alone on nearby BLM lands outside of the Area of Critical Environmental concern, we chose to stay at the campground as we sometimes like to meet other people with similar interests.
We started our journey with a drive through the loop, a one way road and were amazed by not only the colorful surreal geology, but also at the display of wildflowers that met us wherever we looked. As we were slowly meandering through, I looked ahead and spotted a tortoise along the side of the road. Very cool. We kept our distance and took a few photos and then traveled on feeling very good about the way our day was starting. Our destination that day was to drive a big loop exploring the Opal Mountain / Inscription canyon region and after an hour or so in the basin, we headed back out to Irwin Road and turned off on Copper City Road
We had heard that the military built a big ol fence up near the road that head out to Inscription Canyon and Black Mountain, Soon enough, we reached the fence line and headed west along the D9 super highway until we hit the trail we were looking for. Wildflowers carpeted the desert floor, turning the usual dusty brown into goldfields, hence the name of the flower. We saw a wide variety of different plants and flowers in bloom and the air was alive with the sweet smell of springtime. The day was sunny and warm, with temps in the low 80s and clear blue skies. A gentle breeze kept the day from getting too warm and we slowly meandered out way out to Inscription Canyon which we reached about lunch time...........