Canyons, ravines, gullies, buttes, mesas, hoodoos and other such geologic forms are common in badlands. Geological features include canyons, volcanic rock features, and sandstone buttes. The Colorado plains are mostly prairies but also include deciduous forests, buttes, and canyons. Hillocks are similar in their distribution and size to small mesas or buttes. However, there is no agreed size limit that separates mesas from either buttes or plateaus. They are occasionally interrupted by buttes and escarpments. This comprises yellowish open marine sandstones that form most of the cliffs and buttes. Volcanic rocks of Mount Baker and Black Buttes rest on a foundation of non-volcanic rocks. The Sutter Buttes contain many species of flora and fauna. The Cougar Buttes desert in California was ultimately chosen to represent Tunisia. Numerous flat-topped buttes with rich soil stand high above the chaotic scablands. The Salton Buttes are volcanoes in the geothermal field of the same name. Unincorporated areas include Allendale, Dempsey Acres, Red Buttes, Indian Springs, and several others. The Spaniard Gabriel Moraga was the first European to see the Sutter Buttes in 1806. It remains known as the Sutter Buttes massacre.