tuffs in English
Among the 30 different types of stone recognized are varieties of diorite, granite, bedded tuff , sandstones, limestones, and tufa.
Use "tuffs" in a sentence
1. It is probably an alteration product of volcanic tuffs of rhyodactitic composition.
2. Alluvial pyroclasts and reworked tuffs Because the surface of recently deposited tuffs is devoid of vegetation, they are exposed to erosion, and their particles may be transported by local streams toward lower-lying areas, where they accumulate to varying thicknesses.
3. Other tuffs can satisfactorily be used as plaster, while all the materials form acceptable building stone.
4. Accretionary and cored lapilli in the tuffs and pillows in the lavas suggest emplacement in a shallow marine environment.
5. Schellkopf, Brenk, Brohltal, Ahrweiler District, Rhineland-Palatinate, Germany : Active phonolite quarry (selbergite, selbergite tuffs, Devonian schists) on Schellkopf mountain
6. K-Ar ages of Biotites from tuffs in Eocene rocks of the Green River, Washakie, and Uinta basins, Utah, Wyoming, and Colorado R
7. The tuffs differ chemically from the average composition of intermediate to acidic volcanic rocks by their lower alkali and higher H2O and CO2 values.
8. The main rock types present are monzonite and Banatite (a rock of intermediate composition between quartz diorite and quartz monzonite) plus basic and andesitic lavas and tuffs
9. After a compressive phase, the northeastern border of the basin shows high mobility, characterized by superposed alluvial fans. Within the basin, the coarse grained sediments are associated with volcanic tuffs.
10. Mud-flow and laharic tuffs Mud flows and lahars are catastrophic phenomena that may occur regularly at some locations, giving rise to important accumulations of poorly sorted sediments below volcanic slopes.
11. The series consists of silty sericite schists, ordinary and conglomeratic greywackes, arkosic sandstones, thinly banded slates of varvitic type, conglomerates and volcanites, i. e. spilitic porphyrites and amygdaloids, tuffs and quartz keratophyres.
12. A variety of volcaniclastic facies are recognized on the basis of bed geometry, sedimentary structures, and textural characteristics, and include: thinly bedded tuffs and lapillistones that were deposited by fallout from vertical ash columns (some tuffs contain accretionary lapilli and hence originated from subaerial eruption columns); pillow talus deposits (hyaloclastites) resulting from the rapid quenching of lava in water; volcaniclastic turbidites representing relatively deep-water resedimented tephra; and a single massive pyroclastic flow that was emplaced during a single depositional event, and may have been derived from a Plinian eruption or series of Surtseyan eruptions.
13. Acid lavas are found in the area surrounding the High Island Reservoir and the south islands such as Kau Sai Chau, Tiu Chung Chau and Basalt Island, banded acid lava with some welded tuffs are found in the central and southern shore of Pak Tam Chung area.
14. ‘The main slivers of Devonian rocks found within the fault zone in the Rhynie area are sandstones and Andesite in the Rhyme block and the Longcroft Tuffs in the Windyfield block.’ ‘The volcanic strata consist of sheet-like flows of Andesite, dacite, basalts, and trachybasalts that are …