Stop 9: Triassic Cuesta
The last stop on the tour displays rock from a huge ancient river.
Stop 9: Triassic Cuesta

Late Triassic sandstone and conglomerate form a ridge here, also known as a cuesta. These 230-million-year-old rocks represent huge, Mississippi-size rivers that flowed from what is now Texas to a seashore near what is now the Utah-Nevada border.