noun
definition
A light porous rock, now especially a rock composed of compacted volcanic ash varying in size from fine sand to coarse gravel.
synonyms
Examples of tuff in a Sentence
Where lava has been piled up in successive nearly horizontal sheets, with occasional layers of tuff or other softer rock between them, it offers conditions peculiarly favourable for the formation of escarpments, as in the wide basalt plateaus of the Inner Hebrides.
Like the rest of the cluster, the island is of volcanic origin, with tuff, trachyte and obsidian among its ordinary rocks.
The rocks on the verge of the Kisumu province of East Africa are mainly volcanic (basalt, tuff, lava, kenyte).
In the middle of Iceland, where the geological foundation is tuff and breccias, large areas are buried under ancient outflows of lava, which bear evidences of glacial scratching.
In the Rudolf province there and are the basalt, lava, tuff and kenyte of the volcanic mineralogy.
At the base there is frequently a conglomerate or tuff of porphyritic rocks.
It 's a tuff job but seems like all is well.
The remarkable stability of the mountain appears to be due to the innumerable dikes which penetrate the lava flows and tuff beds in all directions and thus bind the whole mass together.
The lavas are usually porphyrites, which occur in sheets, with intercalated bands of volcanic tuff that are sometimes strongly felsitic. One of the vents by which such materials were ejected occurs in the Braid Hills on the south side of Edinburgh.
Made of "Poly Tuff" 150 denier texturized poly-mesh and super-reinforced.
The Legend still offers Viking's well known "Dura Tuff" roof support, which provides the most protection even when the elements surprise you with high winds or other harsh weather.
The latter are represented by large contemporaneous deposits of tuff and felsitic lava which in the Snowdon District are several thousand feet thick.
Tuff and travertine are calcareous deposits found in volcanic districts.
In the vicinity of the Ullughmuz-tagh there exist numerous indications of former volcanic activity, the eminences and summits frequently being capped with tuff, and smaller fragments of tuff are scattered over other parts of the Arka-tagh ranges.
They consist, in most parts of the country, of unconsolidated sediments, consisting of gravel, sand, clay, &c., together with large quantities of tuff, volcanic agglomerate, &c. Some of the sedimentary formations are of marine, some of brackish water, and some of terrestrial origin.
Basalt and tuff, probably of Tertiary age, form the great mass of the Cameroon mountain, also the island of Fernando Po.
The top of the heads of the images is cut flat to receive round crowns made of a reddish vesicular tuff found at a crater about 8 m.
Occasional beds of tuff are intercalated among these lavas, and likewise seams of fine clay or shale which have preserved the remains of numerous land-plants.
Nearly allied are the rock-wallabies of Australia and Tasmania, constituting the genus Petrogale, chiefly distinguished by the thinner tail being more densely haired and terminating in a tuff.
Tuff A type of pyroclastic rock which is derived from the collapse of volcanic ash clouds.
There's also a side roof that creates a nice shaded area near the camper, and of course Viking's standard "Dura Tuff" roof for all weather conditions.
Large areas are overlain with trachyte, basalt, obsidian, tuff and pumice.
Flowing in a deep bed cut in the tuff strata, the river is not navigable.