volcanic sediment

Volcanic sediment in the surrounding region's soil and the huge volume of fresh water coming down the slopes makes the area particularly favorable for agriculture.

"It apparently was covered by volcanic sediment that protected it from high temperatures, erosion and decay."

This rock fell back to Mars, creating a divot, or "bomb sag," in the volcanic sediment.

These are two lithologies, one a graphite-rich metamorphosed volcanic sediment and the other a more gray-green version.

The coastal edge of the city has volcanic sediments, in contrast to the formation of hills of sand.

In 1995, Cabalantian was completely buried when a typhoon turned volcanic sediment into lahars, or mud flows, killing hundreds more.

On one excursion near Pasasagua, Kennet noticed a beautiful contact between serpentinite and volcanic sediments.

It comprises a 5-km thick oceanic plateau sequence of submarine komatiite-basalt lava and volcanic sediments.

Prehistoric volcanic sediment at Candi Ijo (south of Prambanan temple area).

In the past, alum was obtained from alunite, a mineral mined from sulfur-containing volcanic sediments source.

The mobility of the debris flows was due to the high content of fine, weathered volcanic sediment and the availability of sufficient water.

But the volcanic origins of the rock have always been questioned because there are no volcanic vents or other volcanic sediments nearby.

This is an area of barren hills, with a color ranging from white to dark gray, where mud volcanoes around one meter high stand on a volcanic sediment.

Vishnu rocks are a type of volcanic sediment found in the Grand Canyon, Arizona, USA.

Various professional geologists agree that the Klerksdorp spheres originated as concretions, which formed in volcanic sediments, ash, or both, after they accumulated 3.0 billion years ago.

To reach our first target, an area of green metamorphosed volcanic sediments, we need to head steeply up a dirt road that is well walked by indigenous Chorti.

Because metamorphism creates minerals based entirely upon the chemistry of the protolith, certain 'dirty marls' and volcanic sediments may actually metamorphose to an amphibolite assemblage.

The heat flow, 72 mW m−2 for the Penticton Tertiary outlier, and the insulating layers of volcanic sediments produce particularly high temperatures within this basin.

These deposits grade laterally into the shallow water volcanic sediments which include silceous sinter and cherts and also host intrusive rhyolites and later dolerites.

Some of the rivers in this zone transport volcanic sediments to be deposited along the coast and contributes to coastal flooding due to reduced depths of tidal marshes.

The mountain is made of volcanic sediments from the Triassic making it one of the few fossiliferous sequences from the Mesozoic in Zona Sur.

The town's geography is influenced by the San Juan River delta with volcanic sediment deposits from Costa Rican volcanoes interacting with ocean currents and winds.

The occurrence and fission-track ages of Late Neogene and Quaternary volcanic sediments, Siwalik Group, N. Pakistan.

The geography of the land is very similar to that of the interior Patagonian Desert, with volcanic sediments, piedmont plains, large mountain blocks and many usually dry salt lakes.

In contrast to the Proterozoic, Archean rocks are often heavily metamorphized deep-water sediments, such as greywackes, mudstones, volcanic sediments, and banded iron formations.

Volcaniclastic sediments are extremely susceptible to alteration and dissolution.

The initial basin fill was a variable sequence of sandstones and minor volcaniclastic sediments.

The reef was finally overwhelmed by volcaniclastic sediment, was uplifted, and developed paleokarst.

The base of the Yemislicay is characterized by a red pelagic limestone interlain with volcaniclastic sediments.

The andesitic volcaniclastic sediments of the Yemislicay support the subduction of oceanic crust in the region during this time.

A new zone of mineralisation is also evident on the west side of the feldspar porphyry in the footwall volcaniclastic sediments.

Epithermal quartz veins occur at Pajingo within relatively flat-lying andesites, tuffs, volcaniclastic sediments and sandstones.

The thermal expansion of the area is likely to have assisted the formation of a sedimentary basin in which such volcaniclastic sediments accrued and were later folded.

The Group represents an assemblage of both volcanic rocks - lavas, tuffs, breccias - and volcaniclastic sediments - mudstones, siltstones sandstones and conglomerates.

Lower Palaeozoic formations in Wales and the Lake District consist of early basic to acid volcanics and volcaniclastic sediments with later thick basinal greywacke turbidites.

The Tarlac Formation north, east and southeast of Pinatubo consists of marine, nonmarine and volcaniclastic sediments formed in the late Miocene and Pliocene.

Two new formations are proposed, for the mafic volcaniclastic sediments (Big Head Formation) and for the overlying pillow lavas (Barry–Cunningham Formation) above the ophiolite complex.

The rocks, which are chiefly breccias, agglomerates, flows, and volcaniclastic sediments, represent both subaerial and submarine eruptions and in part were redeposited in fluvial and nearshore marine environments.

The sediments and volcaniclastic sediments are of Precambrian Uriconian age and were deposited in rifts and basins that would have been sub-parallel to the back arc basin as subduction continued.

The group comprises about 1800 m thickness of lavas, breccias tuffs and associated volcaniclastic sediments laid down in the marine Welsh Basin during the Llanvirnian stage of the Ordovician Period.

One terrain is characterized by sulfide-facies iron formation in association with volcanic flows and volcaniclastic sediments, whereas the other is dominated by oxide-facies iron formation intercalated within submarine-fan clastic sediments.

The Group comprises around 1400m thickness of ash flow tuffs, flow-banded rhyolites and breccias with a variety of volcaniclastic sediments erupted or sedimented during the Caradocian epoch of the Ordovician period.

Depths in the basin are distributed asymmetrically, being greater adjacent to the West Mariana Ridge than next to the active arc, due to a westward-thinning wedge of volcaniclastic sediments derived from the active arc, and also less thermal buoyancy of the mantle.

Several thousand years ago (during the late Pleistocene to mid-Holocene), the Magadi basin held a freshwater lake with many fish, whose remains are preserved in the High Magadi Beds, a series of lacustrine and volcaniclastic sediments preserved in various locations around the present shoreline.

The greater part of Santa Isabel has been confirmed as an uplifted marginal portion of the Ontong Java Plateau, an elevated area of anomalously thick oceanic crust, here overlain by pelagic limestones and andesitic volcaniclastic sediments derived from an adjacent island arc.

Collaborative research with the University of London on exceptionally well-preserved conifers from volcaniclastic sediments in the Etruria Formation of Westphalian C age, has been the subject of external publications and has featured on BBC Radio 4's Natural History Programme.