tuffaceous


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Related to tuffaceous: Volcanic Tuff

tuffaceous

[tə′fā·shəs]
(geology)
Pertaining to sediments which contain up to 50% tuff.
References in periodicals archive ?
1980) recognized a unit of dacitic tufts and breccias (their 'Bluff tuff-breccia') overlain by andesitic sedimentary and tuffaceous rocks (the term 'possibly' is used here because descriptions of rock units by different authors are comparable only in a general sense, not in detail).
018), this is due to the fact that coastline 11 has similar geologic characteristic to coastline I but also, it is influenced by the Marine phase of the Panama Formation where there is showed up tuffaceous sandstone and tuffaceous siltstone, generating a coastal area with less ruggedness and as a result, a smaller level of complexity in comparison to coastline I.
The bioclastic limestones are overlain through a sharp conformable contact by a section of tuffaceous light yellow to gray mudstones at least 100 m thick, alternating with distinct 5 to 50 cm-thick volcaniclastic tempestites.
where a tuffaceous lacustrine sequence broadly similar in lithology to
The sharp and abrupt nature of the contact between the Lameta sediments and the overlying tuffaceous layers aptly corroborates that the Deccan volcanic activity in western India initiated immediately after the Lameta sedimentation ceased .
Geologically, the mine area is quaternary alluvium, the overburden consisting predominantly of arkosic sand, arkosic sandstone interbedded with tuffaceous clays, and caliche with cobble and boulder lenses.
A second round of work, which included surface sampling, delineated northwest and northeast trending veins up to 5 m wide and 3 km long hosted by tuffaceous rocks within the zone of alteration.
Silica may have been derived from bentonite, tuffaceous rock, and silicate minerals.
Unlike the ash that covered Pompeii, however, what fell on Herculaneum formed a compact mass of hard, tuffaceous matter 60 feet deep that preserved the town embedded within almost as perfectly as amber preserves an insect.
Sediments in the Lizigou Formation are chiefly composed of tuffaceous shale, sandstone, tuff and thin coal seams of one or two layers with a limited distribution.
East of the Howard Peak Granodiorite are Ordovician tuffaceous volcanic and sedimentary rocks of the Turnbull Mountain Formation (Fig.