The Tham Khuyen is a
palaeontological formation located in
Vietnam
Vietnam, officially the Socialist Republic of Vietnam (SRV), is a country at the eastern edge of mainland Southeast Asia, with an area of about and a population of over 100 million, making it the world's List of countries and depende ...
. It dates to the
Jurassic
The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately 143.1 Mya. ...
period. The cave is located in
Lang Son province, about 125 kilometers northeast of
Hanoi
Hanoi ( ; ; ) is the Capital city, capital and List of cities in Vietnam, second-most populous city of Vietnam. The name "Hanoi" translates to "inside the river" (Hanoi is bordered by the Red River (Asia), Red and Black River (Asia), Black Riv ...
.
See also
*
List of fossil sites
References
* (1993); ''Wildlife of Gondwana''. Reed.
*
Mesozoic paleontological sites of Asia
Caves of Vietnam
Landforms of Lạng Sơn province
Jurassic paleontological sites
{{LangSon-geo-stub