Coasts abrasion-depositional

Abrasion-depositional coasts form a transitional type they are widely distributed at the northern and south-eastern margins of the sea. They are distinct... 

Genetically, the Aralian coasts may be classified into three types, namely, abrasion coasts (modeled by marine erosion), depositional and abrasion-deposition-al ones [25]. Coasts of the first type (abrasion) are most common at the western, northern and part of the southern margins of the sea. They are built of compact calcareous marls and sandy-clayey Paleogene and Neogene rocks. Typically, they form high (up to 200 m) abrasion cliffs with wave-cut notches and a narrow strip of sandy beach. In areas where loose rocks occur, coasts are rather low, with a shallow notch and broader beach. There exist varieties of abrasion coasts, such as abrasion-denudation ones and abrasion coasts with slumps, with material from screes, rockfalls, and slumps present in the nearshore zone in abundance. 

Abrasive coasts are mostly composed of clayey deposits, poorly-cemented rocks, or limestones. The cliff heights range from 15 to 35 m. The abrasion rate is controlled by the composition of the coastal rocks and the cliff heights. The recession of the cliffs is also caused by the development of landslide and caving processes, especially under the conditions of strong storms. The length of individual sliding blocks reaches 500 m at a width of up to 15 m. Deep surf niches are formed in the lower parts of the cliffs. 

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