The contact relationship between Silurian and Devonian is parallel unconformity.
2
故本区早泥盆世晚期腕足动物地理区应属老世界域的中国北方区。
Thus, this area shOuld belong to North China Region(otprovince )of the Old World Realm in respoct to reginalism of brachiopod zoogeography during lateEaly Devonian time.
3
矿床产于中川岩体东外接触带内，处于中石炭统与中泥盆统的接触带附近。
The deposit occurred in the exocontact of east Zhongchuan rock body, and is near the stratigraphic contact belt between Middle Carboniferous and Middle Devonian.
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