潮间海滩单元含有一些生物潜穴。
在燕山地区中元古代常州沟组中发育有大量的潜穴化石，潜穴产于常州沟组中部的泥质粉砂岩中。
A large amount of burrow fossils are found in pelitic siltstone in the middle Changzhougou Formation of the Mesoproterozoic in the Yanshan area.
蛇鳗科鱼类广布于各大洋的热带和亚热带大陆架水域，可依靠尖突的头部和尖秃骨化的尾端在沙土或珊瑚礁后潜穴。
Distributed in continental shelf depths of all tropica and subtropical oceans, Ophichthidae can burrow in sand and mud substrates or coral reefs by pointed rayless tail tips or acute snouts.
黄土潜蚀是黄土地区水土流失的重要原因，同时潜蚀作用形成的黄土暗穴是黄土地区主要工程地质问题之一。
The subsurface erosion of loess is a critical problem that causes the loss of water and soil in loess area.
黄土潜蚀是黄土地区水土流失的重要原因，同时潜蚀作用形成的黄土暗穴是黄土地区主要工程地质问题之一。
The subsurface erosion of loess is a critical problem that causes the loss of water and soil in loess area.
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