地层尖灭

地层尖灭（pinch-out）是指沉積岩層向盆地边缘，逐渐減薄厚度直至消失的现象^[1] 向陸源方向的地层消失，是因爲沉積空間減少，沉積物顆粒較粗。向盆地中心方向的地层消失，是因爲沉積物減少。沉積物顆粒較細。^[2]根據地层尖灭點的沉積物顆粒，可推斷沉積物的陸源方向。若地层尖灭點層層向陸源方向推進造成上超，向盆地中心推進造成下超^[3]

參考文獻

^ Glossary of Geology, 5th Edition (American Geological Institute)
^ Boggs Jr (2014) Principles of Sedimentology and Stratigraphy. dc.identifier.isbn 1292021284 (https://lib.hpu.edu.vn/handle/123456789/28988 （页面存档备份，存于互联网档案馆）)
^ Gary Nichols,(2009) Sedimentology and Stratigraphy,Wiley-Blackwell ISBN 1405193794, 9781405193795)

[Glossary-1] Glossary of Geology, 5th Edition (American Geological Institute)

[”Boggs”-2] Boggs Jr (2014) Principles of Sedimentology and Stratigraphy. dc.identifier.isbn 1292021284 (https://lib.hpu.edu.vn/handle/123456789/28988 （页面存档备份，存于互联网档案馆）)

[”Gary”-3] Gary Nichols,(2009) Sedimentology and Stratigraphy,Wiley-Blackwell ISBN 1405193794, 9781405193795)

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