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Cryptocrystalline quartz concretions (flint) of different density, size, morphology and abundance, occur isolated and concentrated in layers in the Late Cretaceous (Tuffaceous) Chalk of NW Europe. Concretions started to grow during early diagenesis at sites of elevated authigenic silica-polymorph concentrations, a result of bacterial metabolism in an anoxic mixture of skeletal carbonate, skeletal opal, organic matter and pore fluid. The late diagenetic growth of flint nodules has been investigated with the help of a numerical model that simulates the dissolution, diffusion and precipitation of different silica polymorphs in a medium of changing porosity/permeability. It is suggested that the occurrence of various flint types reflects the distribution of the early diagenetic, authigenic silica polymorphs, rather than the distribution of detrital skeletal opal. The model results imply that flint nodules can be used to reconstruct the depositional and early diagenetic conditions during the genesis of sequences of Chalk with flint.
What else can I help you with?
What are the 3 types of rock in the south downs?
The downs themselves are made of Chalk. However the rock type associated with the "Wealden Dome" are:ChalkGault ClayLower GreensandAshdown sandsTonbridge Wells sandOf cause the Chalk is not a homogeneous rock type and contains flint layers.
Where to find flint?
Flint is a type of chert. You can find chert all over Washington. Where do you live? If you live near Bellingham there are large nodules of green chert by the water on Chuckanut drive, especially around Blanchard mountain. Do you want to make stone tools or are you interested in fire making? bluepoetspub@yahoo.com
Is flint naturally occurring?
Yes, flint is a naturally occurring sedimentary rock composed primarily of silica. It is often found in chalk or limestone deposits and forms through the lithification of microscopic marine organisms. Flint typically appears as nodules or layers and is known for its hardness and ability to produce sharp edges when fractured, making it historically significant for tool-making.
What is the rock that makes up white cliffs of dover?
chalk
Why are the White cliffs of Dover white?
Because they are made from chalk (calcium carbonate) which is a white material. The truth is that they are really not that white. If you looked closely you would find that some parts are absolutely full of plant growth and flint. The effect that causes them to be "so white" also has to do with reflection of light. The calcium carbonate form coccolith structures that can reflect light. The (south-)western orientation of the cliffs in combination with the rising sun generate the reflection and "light up" the cliffs.
What was the late Paleolithic hand ax made from and where did they find the materials?
You will probably need to be more specific about the exact location and time period you mean. However, the "lith" part of "paleolithic" means "rock", so it was probably made from a type of rock that can be worked to form a sharp edge, such as flint. In which case they would most likely have found flint nodules on the shore near chalk cliffs; flint occurs in chalk, and wave action can wear away the much softer chalk leaving the flint nodules strewn about the base of the cliff.
What are the 3 types of rock in the south downs?
The downs themselves are made of Chalk. However the rock type associated with the "Wealden Dome" are:ChalkGault ClayLower GreensandAshdown sandsTonbridge Wells sandOf cause the Chalk is not a homogeneous rock type and contains flint layers.
Where is flint naturally found?
Flint is naturally found in sedimentary rocks, such as limestone and chalk, as well as in gravel deposits and riverbeds. It is commonly found in regions with ancient seabeds or where glaciers have deposited rocks.
Where can one find flint in the wild?
Flint can typically be found in rocky areas, such as riverbeds, quarries, and exposed cliffs. It is often associated with sedimentary rocks like limestone and chalk. Look for smooth, hard rocks with a glassy appearance, as these may contain flint.
Where can I find flint for making fire-starting tools?
Flint can be found in certain geological formations such as limestone or chalk. It can also be purchased from outdoor stores or online retailers for making fire-starting tools.
Is flint soft?
Flint is a very hard rock and forms very sharp glassy flakes when hit with another flint. Flint was used to make knife blades by early man and is the ancient remains of sea sponges and are found in layers in chalk. Flint was also used to generate a spark in tinder boxes(a predecessor to matches) and to ignite gunpowder in early firearms.
How is flint formed?
Flint is unique to chalk, and chalk is entirely composed of the remains of tiny sea creatures called coccolithophores and diatoms. Their various shells and skeletons were composed of mainly calcium carbonate, with some species utilising silica. After the chalk was deposited, decompositional bacteria began to feed on organic matter and released sulphur-rich compounds. These compounds mixed with water and formed a weak acid which began to locally dissolve the calcium carbonate proto-chalk. The resulting void filled with a silica rich solution, which over time hardened along with the strata, forming the flint nodules within chalk bedding we see today.
Where is flint rock typically found in nature?
Flint rock is typically found in sedimentary rocks, such as limestone and chalk, as well as in gravel deposits and riverbeds. It is commonly found in regions with ancient seabeds or where glaciers have deposited rocks.
Where is flint typically found in nature?
Flint is typically found in nature in sedimentary rocks, such as limestone and chalk formations. It is commonly found in regions with ancient seabeds, where it forms as a result of the deposition and compression of silica-rich materials.
What is dover sea front made of?
The white cliffs of Dover are mostly chalk (white calcium carbonate) with some small layers of black flint.
How common is the presence of flint in geological formations?
Flint is a relatively common mineral found in geological formations, particularly in sedimentary rocks like limestone and chalk. It is often associated with ancient marine environments and can be found in various parts of the world.
Where can you find flint rock for making tools and starting fires?
Flint rock can typically be found in areas with sedimentary rock formations, such as riverbeds, quarries, or exposed cliffs. It is often found in regions with limestone or chalk deposits. Flint can also be found in gravel beds, beaches, and areas where glaciers have deposited rocks.
