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Isolated limestone hills and towers near the Gulf of Thailand coast, and granitic monadnocks that extend further inland, protrude through alluvial silts of the Mekong River delta in Vietnam and Cambodia. The form of the granitic monadnocks is guided by bedrock geometry and some exhibit extensive boulder mantles residual from deep weathering within which large boulder cave complexes occur, together with underground stream systems that feed permanent springs. The limestone hills vary in form according to differences in structure, rock purity and hill-base topographic setting and contain vertically-developed vadose invasion caves and basal floodwater stream caves. Evolution of the present day hillbase and stream cave morphology has been influenced by changes in the base level of vadose activity that have been related to changes in relative sea level, most recently as the Mekong delta has formed during the Holocene.

Item Type:	Refereed Article
Keywords:	Mekong delta; boulder caves; coastal karst; Holocene; Cambodia; Vietnam.
Research Division:	Earth Sciences
Research Group:	Physical Geography and Environmental Geoscience
Research Field:	Geomorphology and Regolith and Landscape Evolution
Objective Division:	Environment
Objective Group:	Environmental and Natural Resource Evaluation
Objective Field:	Environmental and Natural Resource Evaluation not elsewhere classified
Author:	Kiernan, K (Dr Kevin Kiernan)
ID Code:	73146
Year Published:	2011
Deposited By:	Geography and Environmental Studies
Deposited On:	2011-09-15
Last Modified:	2012-06-25
Downloads:	3 View Download Statistics