Bunter Sandstone
one of the three great divisions of Triassic formation. It is the lowest, i. e., the oldest, of the series. It corresponds to the grès bigarré (variegated freestone or grit) of the French. In the Hartz it is more than 1,000 feet thick; in Cheshire and Lancashire, England, about 600. The footprints of old called chirotherium, now known to be labyrinthodont, are found in the bunter; the plants are chiefly ferns, cycads, and conifers.