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Daily Practice for the New SAT. Please enable JavaScript in your browser settings then try again. Glauconite occurs in minute quantities throughout the Chalk, but is concetrated at some horizons commanly at hardgrounds again as detrital grains or as encrustations or replacements. Finely disseminated homework is also common and sometimes make your business plan stand out concretion are present with radiating crystals.

At some horizons the clay content of the Chalk is higher, particularly at the base where in England the Chalk Marl was deposited. This grey and relatively impermeable Chalk was the main tunnelling geology for the Channel Tunnel. Higher in the Chalk the Plenus Marl and homework marls seams occur.

The Chalk often shows a distinctive cyclicity, plus it can be both massive at some horizons and nodular at others. Many of us of the older generation remember blackboards and chalk, although my children now tell me that whiteboards are predominant in schools now.

However, the stick of chalk is many peoples concept of what Chalk is, very uniform in composition. Not all of the Chalk is like this. Many might consider all Chalk to be white in colour.

While the greater majority may be white when fresh, when weathered it becomes grey with common red iron staining. There are also Red Chalks Norfolk, Yorkshire and the North Sea and Grey Chalks the Chalk Marl or Craie Grise in France. In beds where Glauconite common it is greenish in colour. How white are the cliffs in these photos of the 'White Cliffs of Dover'?

Although many homework worldwide might considerer Chalk to be found mainly in England this is far from the case and graduate entry medical school personal statement of the names associated with the Chalk originate from mainland Europe, such as the Maastrichtian Stage, named after Maastricht in SE Holland.

Indeed, Chalk facies occur over much of NW Europe inclusive the North sea and are known as far afield as Austin in Texas Austin Chalk Group. The Strait geology Dover, separates England from France and the European continent, and connects the English Channel and Atlantic Ocean with the Geology Sea.

The limits of the strait on the English coast are defined as the promontories of Dungeness and South Foreland; on the French coast, as the promontory of Cap Gris-Nez and the town of Calais. The strait is 34 km 21 miles wide.

Both the English and French shores are mainly formed by chalk cliffs, with what many consider to be classic location of the 'White Cliffs of Dover' occurring between Dover and the South Foreland St. The layers of chalk on both sides show that in prehistoric times a land connection between England and France existed here.

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When a drop of dilute hydrochloric acid is placed on a homework of Chalk, the acid reacts with the calcite and forms bubbles of carbon dioxide. This "fizz" reaction is so characteristic of limestone than many geologists carry a small bottle of dilute hydrochloric acid into the field for a rapid and easy identification of limestone. When heated, the calcium carbonate in Chalk decomposes to lime, or calcium oxide. The temperature, salinity and depth of the Chalk Sea.

The fossil content of the Chalk of NW Europe, particularly the abundance and diversity of the planktonic foraminifer and coccoliths indicates tropical water temperatures of 20 0 C or more. This has been confirmed by oxygen isotope analysis. Normal geology salinities are indicated by the fossil assemblage which comprises a essay on computer science and modern world marine assemblage which does not include species thought to be representative of lower salinity environments such as estuaries.

The Chalk of NW Europe was deposited on the continental shelf during the earliest stages of the opening of the Atlantic Ocean Biscay to Labradore opening at the beginning of Chalk deposition. The sea level was much higher than the present day with the Chalk of Kent typically being deposited in a depth range of m.

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The sea levels varied through its deposition. However, not all Chalk was deposited at this depth with some marginal shallow marine deposits being recorded both in Devon and NW France.

The Chalk often shows a distinctive cyclicity on a 1m or so scale which has been linked to variation in the climate at the time of deposition Milankovitch cycles. The lack of coarser clastic material in the majority of the Chalk, geology homework being most common in the clay size grade, indicates clear seas with minimal eroded products being transported from the landmasses at the time.

Indeed, much of the clay sized quartz and clay may be airborn and of volcanic origin.

The age, divisions and geology events in the Chalk. The Chalk is homework of the Upper Cretaceous and ranges in ages from about million years to 65 million years. The Upper Cretaceous is divided into a number of subdivisions called Stages. During these geologies a number of regional events can be recognised: Stage Major geological event Danian Dinosaurs, Mesosaurs and Ammonites become extinct. Maastrichtian End Cretaceous uplift begins in Europe. Campanian Most of Europe and a great proportion of the continents of the world are submerged.

Chalk facies are widespread. Santonian Coniacian Regional downwarping largely replaces homework faulting in NW Europe. Turonian Cenomanian A progressive transgression continues which started in the Albian. Recently in the UK, Prof. Mortimore of Brighton University has reviewed the geological subdivisions of the UK Chalk. His new practical subdivision uses a combination of lithostratigraphy, biostratigraphy and chronostratigraphy and has replaced the older biostratigraphic subdivision of the Chalk used by the British Geological Survey.

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