Here is what the park web site says
With a downcutting action, tributary drainages of the Little Red River have exposed geologic layers in the park down to the Permian age Quartermaster formation, formed approximately 280-250 million years ago. These layers are commonly referred to as “red beds” because of the red coloration of their constituent shales, sandstones, siltstones and mudstones. Each of the geologic ages exposed by this headwater drainage erosion is characterized by different colorations including shades of red, orange and white. The park’s steep and colorful canyons and bluffs are the breathtaking result of this powerful natural process
To me the white bands appeared to be a type of very soft white sand stone but could easly been ash I'm no geologist, very brittle with very definded grain up close it was very pretty white with red streaks running through it. The river bed was covered in pieces that had broken off and were very easly to break with your hands. Thought they would look very nice cleaned up and sealed with sometype of clear polymer and made into a paper wieght.
Had to be carefull on the Haynes Ridge overlook trail as the stone easly broke under foot and hand making the hike more challenging that it first appeared.
The area is far enough away from cities and towns that there is very little light polution and made for some wonderfull star and moon glazing through my telescope.
F-150 Lariat 2012 T12BH 2012
Camping RenFaire 42 days
Non RenFaire camping 34 days