Sentences with word «siliceous»

The smoking — or in this case, oozing — gun is a layer of siliceous microfossils called diatoms.

3.48 billion year old siliceous rocks of the Dresser Formation, Pilbara craton, Western Australia, preserve evidence for having formed in hot springs on land — the earliest life on land yet known, and about the same age as when life may have been present on Mars (a wetter time in its past, with heating from once active volcanoes and bolide impacts).

Going into a little more detail, the diatomaceous earth is formed from algae with siliceous shells.

Science lesson of the day: The colour of the water in the Whitsundays is caused by fine particles of suspended siliceous sediment reflecting light.

Sea - surface temperature and sea ice distribution of the Southern Ocean at the EPILOG Last Glacial Maximum — a circum - Antarctic view based on siliceous microfossil records

Your interesting article on the origins of bananas mentioned mineral formations known as siliceous phytoliths in plant tissue, and said...

One of the Spirit rover team geologists, Dr. Steve Ruff, a proponent of the Home Plate (Columbia Hills) silica site on Mars having been formed by an ancient siliceous hot spring, came along on a geothermal field trip I led in February 2016 to the Rotorua area with Australian geologists who work on Archean rocks.

As evolving diatom populations expanded, a more efficient biological pump buried more CO2 at depth that is now detected as siliceous ooze or as biogenic opal deposits.

Pumice is a highly vesicular pyroclastic igneous rock of intermediate to siliceous magmas including rhyolite, trachyte and phonolite.

«These are actually siliceous replacements of roots and stems of plants like petrified wood,» Sharp says.

Kathy Campbell is showing the group her research rock collection and discussing similarities with Archean and Columbia Hills siliceous rocks.

It also calls for diatomaceous earth (DE), a naturally occurring siliceous rock that is easy crumbled into a fine white powder.

PHYSICAL FEATURES & CLIMATE This lowland area on the northern coastal plane is an extensive complex of shallow lagoons streams, rivers and marshes, overlying alluvial deposits of siliceous sand and beds of impermeable clay.

Both areas are on shallow siliceous soils of low fertility and high erodibility formed on primarily granitic rocks.

As discussed in Natural Cycles of Ocean Acidification, diatoms are large, produce siliceous shells, and more rapidly shuttle CO2 from the surface to ocean depths.

Porosity formed by leaching in siliceous carbonate rocks gives the reservoir low permeablity, but relatively homogeneous composition for miscible displacement.

During the early Miocene, calcareous biogenic sediments began to be displaced northward by siliceous biogenic sediments with higher rates of sedimentation reflecting the beginning of circulation related to the development of the Antarctic Convergence.

The Columbia Hills site is nearly pure silica and has a close spectral match to siliceous hot spring deposits (sinter) from the high - elevation, Mars - analogue geothermal system at El Tatio in Chile.

This dust, I am sure, is made of the siliceous skeletons of diatoms that have died in the upper stratum of the sea and fallen slowly to the bottom.

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At any rate, when «normal» rain containing natural carbonic acid falls upon silicon - containing sedimentary rocks formed over eons from the shells of tiny marine creatures — radiolarians, diatoms and some sponges — this «siliceous» rock combines with the carbonic acid to form ions of bicarbonate.

Granite A popular countertop choice because of its appearance and durability, granite is a siliceous stone made from an extremely hard volcanic rock.