Grains are coated by hematite and clay giving the sandstones a characteristic red-bed appearance. Prosauropod bones were found in two beds of trough cross-bedded sandstone in the lower part of the ...

In May 2023, four friends and I hiked to "the Wave," an awe-inspiring Navajo sandstone cross-bedded rock formation in northern Arizona consisting of 190-million-year-old sand dunes that calcified ...