Abstract

The nature and evolutionary history of Hạ Long karst can be generalized as follows: In addition to the basic conditions to Hạ Long karst formations such as limestone of Bắc Son Formation, dissolved phenomenon, rainfall in the humid tropical conditions, the role of marine, mechanical corrosive effects of the sea to play important role; Neotectonic movement to trend downward, the decision for the formation and development of the karst landscape of Hạ Long; Continental development phase of Hạ Long lasting and continuous throughout MZ-KZ and has created the landscape with the style karst peak-cluster-valley, characteristic for Hạ Long karst; Marine incursion in Hạ Long karst early, about 40,000 years ago and went through several stages of sea level change to the composition of the sea level on the limestone scarp and terraces; The nature and evolutionary history Hạ Long karst distinct nuances differ karst southeast of China, so do not use the terms of China karst as "Fenglin, Fengcong" for the karst in Việt Nam.