ARENACEOUS ROCK • DICCIONARIO INGLES.COM • Definition of Arenaceous rock

... broad bottom on both sides of the river, comprising about twelve hundred square miles, bounded on the north and east by the Black Hills, on the south by a "divide" of arenaceous rock, embedded in marl and white clay, almost barren of verdure, while on the west are the beautiful Medicine Bow Mountains. The southern portion of these plains is watered by a succession of streams which rise in the mountains, some of them discharging their volume into the Laramie ...

— The Great Salt Lake Trail • Colonel Henry Inman