博格达山北缘的石炭系柳树沟组岩层为准噶尔南缘东段前缘坳陷的主要物源。
The carboniferous Liushugou Formation in the northern area of the Bogda Mountain was the main source area of frontal depression.
冠状沟前缘多较模糊，冠状沟后缘一般较清晰、容易识别。
Generally, the anterior line of the coronal sulcus was indistinct, whereas the posterior line was clear and easy to be identified.
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