Ha Long Bay

Geological history geomorphology of Ha Long Bay was recognized scientists to undergo at least 500 million years old geographical circumstances are very different, many times to create painting, marine degradation; lost sink, the sea advances. Ha Long Bay but retains the mark of the paint, place great troughs of the earth, is composed of local savings, boasts ancient sites . Ha Long Bay area was a deep sea in the century Odovic - Silua (about 400-500 million years ago) , a shallow sea in the Carbon century - Perm (about 200-300 million years ago), sea shore in the late Paleogene Neogene (about 20-26 million years ago) and spent some time in the Age of Human Miserere ( about 2 million years ago). In the century Triassic (190-240 million years ago) when the earth in general, in particular the European hot dry climate, the region is Halong Bay with the marshes wet forests minnows, giant ferns accumulate many generations .

Ha Long Bay with Karst evolution a full year spent 20 million through a combination of factors such as the time between the limestone is thick, hot and humid climate and tectonic processes increase slowly overall. Ha Long Bay contains many types of Karst topography bohemian style, Linh Phong. Karst topography bohemian style: Includes a cluster of limestone are often contiguous with pyramidal peak around 100 meters, 200 meters the highest. Karst topography Linh Phong model: characterized by peaks separated forming steep cliffs tower. Most of the tower height from 50 - 100m .Ratio between the height and width of about 6m. Karst Plain is a large basin development in the Karst region have relatively flat surfaces. Karst Plain is formed by different methods like: The tectonic related slump pits local pride; by the drop ceiling of the underground river valleys, underground caves, the existence of rocks as being insoluble erosion strong erosion between the Karst topography that surrounded the city higher ... Karst Field Halong frequently flooded.

As the cave system diversity on the Bay, is divided into three groups: Group 1, are relics of ancient underground cave, Sung Sot cave is typical, Tam Cung dynamic, long term, Thien Cung cave Top Wood, Dragon, etc. .. Group 2, a typical Karst caves are the Virgin, Bo Nau, Tien Ong, Hang Drum, etc.. Group 3, a system of marine palate, typically as three other caves in this cluster Ba Ham lake, cave Luon, Ba Hang ...

Ha Long Bay Karst global significance and nature of scientific basis for geomorphology. Geological environment is the foundation of values generated by the Ha Long Bay as biodiversity, archaeological cultures and other human values.