Red Sandstone Cliff

I was walking along a cliff that was all smoothed out from water erosion.  It was red sandstone and had lots of designs in it.  I looked closer and it was full of tiny grooves from the water running over it.  I looked up the cliff and it looked like the map of a city from all the patterns that were grooved into it.  There was a small cave where I could rest.  I looked down and there was water everywhere.  There was a small outcrop of rock and my car keys were resting on it.  I was afraid to disturb them because they might slip and fall into the water below.