海西期是指晚古生代时期。晚古生代地壳运动总称为海西（Hercynian）运动，又称华力西（Variscan）运动。得名于德国海西山。其所形成的褶皱带，称海西或华力西褶皱带。
成矿时代属早—中海西期。
某铀矿床在空间上与一海西期花岗岩体伴生。
The ore deposit described in this paper is spatially associated with the Hereynian granite body.
早期（中海西期）形成的裂缝规模小、倾角低缓。
The fractures which were developed in early stage (the middle Hercynian stage ) have small scale and low obliquity.
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