tuffaceous

Rock that has more than 50% tuff is called tuffaceous.

A tuffaceous monument has been erected in memory of Tatul.

Red roundstone conglomerate is common and all beds are tuffaceous.

It forms the rolling tuffaceous plateau.

This plant only grows in tuff, a soil composed of volcanic ash, or tuffaceous sandstone.

The tuffaceous composition of some rock layers show that this was a volcanic area, occasionally experiencing heavy ashfalls from eruptions.

The group contains volcanogenic conglomeratic sandstone, fine-grained tuffite and tuffaceous sediment.

The old lake's bottom layers are now volcanic ash hardened into sedimentary rock, becoming fine-grained tuffaceous shale.

The Urquhart is 1,000 metres thick and is a grey dolomitic shale with tuffaceous horizons.

It was from one of those tuffaceous outcrops on the side of the Bwlch Main ridge, away from the crowds.

Ferrierite typically occurs as an alteration mineral in basaltic rocks and in tuffaceous sediments.

Next is the Bell Top Formation, which consists of rhyolite, basalt flows, and tuffaceous sandstones.

Most islands are composed of ignimbrites township, rhyolitic tuff and tuffaceous sandstone-colored altered and distorted.

The eastern half of the province is largely covered by Jurassic Period acid volcanic rocks and Cretaceous tuffaceous sandstone.

There is a clear distinction between the tuffaceous rocks of the Uriconican Volcanics (dark brown/black/grey) and the intrusive granophyre which is pink.

In the Eocene the Shuangji Formation formed mostly from volcanic particles in the form of tuff and tuffaceous sandstone.

The rocks are grey, finely bedded, lacustrine, sandy mudstones mixed with tuffaceous mudstones formed from the intermittent ashfall of volcanic events.

Individual rock fragments appear to be from the middle and upper units of the Altamira Shale, consisting of tuffaceous and silty shale.

Cryolophosaurus was discovered in 1990-1991 in "tuffaceous" siltstone deposited in the Pliensbachian stage of the Early Jurrasic, approximately 182 to 190 million years ago.

It was discovered and collected in the tuffaceous siltstones and mudstones of the lower part of the Hanson Formation, in Mount Kirkpatrick.

In the Caballo Mountains, this can be seen in the Palm Park Formation, a thick layer of andesitic or tuffaceous mudstones, sandstones, and breccia.

The bench comprises the NW-most moraine-covered volcanic outcrops on the island, upon which occur tuffaceous conglomerate block and shell fragments of the Scallop Hill Formation.

These Paleozoic rocks are overlain by Late Cretacecous coal-bearing argillites and quartzite-like sandstones and basaltic lava and tuff with lenses of tuffaceous argillite.

The oldest of these sediments are Early Cretaceous alluvial clays, silts, and sands that contain layers of conglomerate, tuff, tuffaceous sandstone, coal, and, at top, rhyolite.

The lower section of the member consists of tuffaceous mudstone while the upper section consists of tuffaceous turbidites formed by underwater avalanches.