- GeoRef, Copyright 2008, American Geological Institute. Reference includes data from Bibliography and Index of Geology Exclusive of North America, Geological Society of America, Boulder, CO, United States
Two sets of ripple marks, one at right angles to the other and differing in wave length and amplitude, have been observed in the sandstone. Both sets are slightly asymmetric. Whether they are of contemporaneous origin or formed at different times is not yet known.