tuffaceous

The Owyhee Uplands and Canyons ecoregion is a sagebrush steppe containing deep river canyons, barren lava fields, badlands, and tuffaceous outcrops that are riddled by caves.

Ecoregions of Oregon (EPA) 2009

It is mostly underlain by volcanic ash, rhyolite, and tuffaceous rocks.

Ecoregions of Nevada (EPA) 2009

The Owyhee Uplands and Canyons ecoregion contains deep, precipitous river canyons, barren lava fields, badlands, and tuffaceous outcrops that are riddled by caves.

Ecoregions of Idaho (EPA) 2008

The rocks of the western peaks are typically volcanic or plutonic, with peaks above 1,500 consisting of hard tuffaceous lavas, rhyolite and granite.

Mount Wuyi, China 2008

The islands, all of which are ice-free, are composed of basaltic lava and tuffaceous material, resulting from eruptions of volcanic vents near sea level.

Heard Island and McDonald Islands, Australia 2008

Now we pass the masses of tuffaceous breccia that "Pap" Church, the old stage-driver used to call the Devil's Pulpit, and the devil's this and that or the other, until many a traveler would wish they were all with the devil.

The Lake of the Sky Lake Tahoe in the High Sierras of California and Nevada, its History, Indians, Discovery by Frémont, Legendary Lore, Various Namings, Physical Characteristics, Glacial Phenomena, Geology, Single Outlet, Automobile Routes, Historic Towns, Early Mining Excitements, Steamer Ride, Mineral Springs, Mountain and Lake Resorts, Trail and Camping Out Trips, Summer Residences, Fishing, Hunting, Flowers, Birds, Animals, Trees, and Chaparral, with a Full Account of the Tahoe National Forest, the Public Use of the Water of Lake Tahoe and Much Other Interesting Matter George Wharton James 1890

The high-grade mineralization is hosted in intensely silicified, veined, and hydrothermally brecciated sedimentary and tuffaceous volcanic rocks.

unknown title 2011

Those in the lower sides of the layers were most thickly encrusted with tuffaceous matter; those in the upper surfaces on the contrary were very white and free from the red ferruginous ochre which filled the cavities of those in the breccia, although they contained minute transparent crystals of carbonate of lime.

Three Expeditions into the Interior of Eastern Australia, Volume 2 Thomas Mitchell 1823

The large bone projected from the upper part of the breccia, the only substance which supported as well as separated several large blocks, as shown in the accompanying view of the cave (Plate 45) and it was covered with a rough tuffaceous encrustation resembling mortar.

Three Expeditions into the Interior of Eastern Australia, Volume 2 Thomas Mitchell 1823

This target consists of two stacked flat-lying disseminated gold zones hosted by tuffaceous rocks, with true thicknesses of about

The Earth Times Online Newspaper 2010