VAN CHAI ROCK BOOK
VAN CHAI ROCK BOOK

Introdution

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Time to visit a place: 30 phút

Open Time: 7:00 AM - Close Time: 4:00 PM

Email: ubnddongvan@hagiang.gov.vn

Address: xã Vần Chải, huyện Đồng Văn, tỉnh Hà Giang Xã Vần Chải, Huyện Đồng Văn, Tỉnh Hà Giang

A magnificent scene with hundreds of karst cones ridging the terrain. But the cones have their own internal peculiarity - consisting of hundreds of thin layers of limestone, which are all tilted steadily in one direction. One side of the cones is quite gentle while the opposite side is quite steep. Scientists call it “skewed roof” or “hogback” landform. Others call it a rock book - thin layers being the giant pages of the book on the "History of the Earth." More than 380 million years ago, in the Devonian period, the area was still submerged below sea level. Clay-rich carbonate rocks that form the landscape we now admire were formed at the sea bottom. If the sedimentation conditions were stable, then the layers would be thick, reaching sometimes up to tens or hundreds of meters. Otherwise the layers would be thin, sometimes only a few centimeters, lying initially quite horizontal. As the tectonic context changed, oceans became continents and vice-versa, rock layers at the seabed emerged to become mainland. Furthermore, due to collisions one end of the layers was raised more than the other, causing them all inclined evenly toward one side. Subsequent geological processes such as erosion, faulting ... View more

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Introdution

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A magnificent scene with hundreds of karst cones ridging the terrain. But the cones have their own internal peculiarity - consisting of hundreds of thin layers of limestone, which are all tilted steadily in one direction. One side of the cones is quite gentle while the opposite side is quite steep. Scientists call it “skewed roof” or “hogback” landform. Others call it a rock book - thin layers being the giant pages of the book on the "History of the Earth." More than 380 million years ago, in the Devonian period, the area was still submerged below sea level. Clay-rich carbonate rocks that form the landscape we now admire were formed at the sea bottom. If the sedimentation conditions were stable, then the layers would be thick, reaching sometimes up to tens or hundreds of meters. Otherwise the layers would be thin, sometimes only a few centimeters, lying initially quite horizontal. As the tectonic context changed, oceans became continents and vice-versa, rock layers at the seabed emerged to become mainland. Furthermore, due to collisions one end of the layers was raised more than the other, causing them all inclined evenly toward one side. Subsequent geological processes such as erosion, faulting etc. have gradually formed the cones, exposing the "rock pages". Scientists are flipping through these "rock pages" to restore the past environmental, climatic and biologic etc. characteristics, to shed light on the history of evolution of the Earth in the region.

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