Search results
Results from the WOW.Com Content Network
The Formation is associated with deposits of the Chalk Group, subsequent Palaeogene and Neogene strata, and occasionally Upper Greensand. [2] It occurs in sheets or patches of various sizes over a large area in the south of England, from Hertfordshire on the north to Sussex on the south, and from Kent on the east to Devon on the west.
Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [1] [2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.
Flint fields (German: Feuersteinfelder) are large natural deposits of flint.They are found in numerous Jurassic and Cretaceous beds across the whole of Europe. [1]Such deposits may be found in Aachen-Lousberg, Kleinkems, Schernfeld, Osterberg bei Pfünz, Baiersdorf, Abensberg-Arnhofen and Lengfeld as well as the German island of Rügen.
The original soil surface is buried, and the formation process must begin anew for this deposit. Over time the soil will develop a profile that depends on the intensities of biota and climate. While a soil can achieve relative stability of its properties for extended periods, [ 117 ] the soil life cycle ultimately ends in soil conditions that ...
Upper Mercer flint or Upper Mercer chert is a type of flint, or a pure form of chert, found in Coshocton, Hocking, and Perry counties of Ohio. Made of forms of silica and quartz , the hard and brittle stone was used by prehistoric people to make tools and weapons.
Another clay associated with coal beds is a smooth, flint-like refractory clay or mudstone composed predominantly of kaolin, called "flint clay". Flint clay breaks with a pronounced conchoidal fracture and resists slaking in water. [1] Flint clay can be either detrital or authegenic in origin.
Deposition is the geological process in which sediments, soil and rocks are added to a landform or landmass. Wind, ice, water, and gravity transport previously weathered surface material, which, at the loss of enough kinetic energy in the fluid, is deposited, building up layers of sediment.
Depending on the environmental conditions present at the time of their formation, concretions can be created by either concentric or pervasive growth. [11] [12] In concentric growth, the concretion grows as successive layers of mineral precipitate around a central core. This process results in roughly spherical concretions that grow with time.