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noun. geology layering within one or more beds in a series of rock strata that does not run parallel to the plane of stratificationAlso called: false bedding.
Inclined layers in sediment or sedimentary rocks that rocks that reveal the direction of wave or wind transport. What do cross beds represent. The moving front of a ripple or dune. What is the relationship between water currents and cross beds. Cross bed sit at an angle to current direction.
The cross-beds reflect the steep faces of ripples and dunes. These steep faces tilt down-current and thus indicate current flow direction. Cross-beds are commonly curved at the base; this gives a handy way of determining right-side up in complexly deformed rocks.
The sedimentary “bed” is the basic unit,or fundamental building block of stratigraphy (Campbell, 1967). The lithologic composition of beds, their geometry, their trajectory, stacking patterns and hierarchies are used to interpret their depositional setting.
Cross bedding forms on a sloping surface such as ripple marks and dunes, and allows us to interpret that the depositional environment was water or wind. Examples of these are ripples, dunes, sand waves, hummocks, bars, and deltas.
Two broad types of chert form, nodular and bedded, with abundant variations in between. Bedded chert typically forms in clastic starved basins (i.e. those with little sediment influx), along the edge of continents (such as divergent continental margins) where strong upwelling occurs.
Flint is gray to black and nearly opaque (translucent brown in thin splinters) because of included carbonaceous matter. Opaque, dull, whitish to pale-brown or gray specimens are simply called chert; the light colour and opacity are caused by abundant, extremely minute inclusions of water or air.
In some areas, chert is ubiquitous as stream gravel and fieldstone and is currently used as construction material and road surfacing. Part of chert’s popularity in road surfacing or driveway construction is that rain tends to firm and compact chert while other fill often gets muddy when wet.
Chert has four diagnostic features: the waxy luster, a conchoidal (shell-shaped) fracture of the silica mineral chalcedony that composes it, a hardness of seven on the Mohs scale, and a smooth (non-clastic) sedimentary texture.
Biochemical chert is formed when the siliceous skeletons of marine plankton are dissolved during diagenesis, with silica being precipitated from the resulting solution. Chert can also form through direct precipitation from silica rich fluids, e.g. agate is formed by the precipitation of silica in voids within a rock.
The Rhynie Cherts in Scotland contain remains of the oldest land ecosystem from nearly 400 million years ago early in the Devonian Period. And the Gunflint Chert, a unit of banded iron formation in western Ontario is famous for its fossil microbes, dating from the Early Proterozoic time some two billion years ago.
Flint can be found in the wild spaces of Colorado, Connecticut, Florida, Georgia, Indiana, Iowa, Kentucky, Maryland, Michigan, Mississippi, Missouri, Nebraska, New Jersey, New York, North Dakota, Ohio, Rhode Island, Tennessee, Texas, West Virginia, Wisconsin and Wyoming.
Some limestone contains chert, which is very, very hard silica (like flint). Chert: Chert is a rock composed of very small microscopic quartz crystals. Potassium or Plagioclase Feldspar Limestone fizzes in dilute hydrochloric (HCl) acid, because it is composed of the mineral calcite, CaC03.
Chert is a sedimentary rock consisting almost entirely of silica (SiO2), and can form in a variety of ways. Replacement chert forms when other material is replaced by silica, e.g. petrified wood forms when silica rich fluids percolate through dead wood and the silica precipitates to replace the wood.
It is found in all forms of rock: igneous, metamorphic and sedimentary. Quartz is physically and chemically resistant to weathering. When quartz-bearing rocks become weathered and eroded, the grains of resistant quartz are concentrated in the soil, in rivers, and on beaches.
Rose quartz is a macrocrystalline variety of the mineral Quartz (SiO2). Quartz is the most abundant single mineral on earth. It makes up about 12% of the earth’s crust, occurring in a wide variety of igneous, metamorphic and sedimentary rocks.
Rose Quartz is the perfect stone to keep under your pillow for a good night’s sleep. Due to its unique properties and characteristics, sleeping with a Rose Quartz crystal can have a great effect with regards to feeling more rested, relaxed and inspired.
Like Clear Quartz, Rose Quartz can be impersonated by taking glass and adding a rose-colored dye. In this case, you can look for bubbles in the rose-colored glass. If you see them, this is a good sign that your Rose Quartz is not real.
Another way to sound test the glassware is to lightly run a wet finger in a circular motion around the rim. If it’s crystal, you will be able to hear a subtle tone that emanates from it. With a close eye, inspect the sharpness or smoothness of the cut. The smoother it is, the more likely it’s crystalware.
Rose Quartz is known as the symbol of love. People who lack love in their married should wear this substitute. Rose Quartz looks transparent but it is translucent. Transparent Rose Quartz is very rare to get whereas, translucent is easily available.
So the starting price for this gemstone is around $100 per carat.
“As a necklace, rose quartz is especially powerful because it’s worn close to the heart and heart chakra. This enables the heart center to open and release any tensions or stresses held there,” Birch claims.
Place the natural, rough or raw pieces of rose quartz in the south west direction in the bedroom, to attract romance in your life. South-west direction is the ideal direction for bedrooms as it represents romance, love and marriage.