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The products of chalk weathering are dissolved in rainwater and are transported in stream flow. Chalk streams transport little suspended material (unlike most rivers), but are considered "mineral-rich" due to the dissolved calcium and carbonate ions. The surface water of chalk streams is commonly described as "gin clear".
River Chess watercress beds near Sarratt. Historically, the clear chalk stream water of the River Chess, together with the fertile land, was ideal for growing watercress, and this industry which flourished in both Chesham and Rickmansworth in the Victorian era supplied London, being transported on the newly constructed Metropolitan Railway.
Chalk is so common in Cretaceous marine beds that the Cretaceous Period was named for these deposits. The name Cretaceous was derived from Latin creta, meaning chalk. [10] Some deposits of chalk were formed after the Cretaceous. [11] The Chalk Group is a European stratigraphic unit deposited during the late Cretaceous Period.
An extensive Neolithic ritual complex, the main elements of which are four large cursus monuments and a henge, is situated near the eastern end of the Great Wold Valley. More than 1,400 Bronze Age round barrows, comprising one or more burials and accompanied by items of grave goods, are known to exist on the Yorkshire Wolds.
The stream also badly flooded the village of Burton Fleming in 2012 when the water was 2 feet (0.61 m) deep in places. [8] Villagers in Boynton have an annual duck race on the stream in May. Hundreds of yellow plastic ducks are paid for and race the Race in aid of funds for the village hall. [9]
As a massive winter storm is rolling through regions of the United States on Monday, see pictures of snow from across the Midwest and East Coast.
The Chalk Group is now divided into a White Chalk Subgroup and a Grey Chalk Subgroup, both of which are further subdivided into formations.These modern divisions replace numerous earlier divisions, references to which occur widely on geological maps and in other geological literature.
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