主要物源来自北部的汉南古陆。
The major sediments originated from the northern Hannan Old Land.
最重要的是，我的父母和我去汉南洲，花了一个星期在那里。
The most important was that my parents and I went to Hannan Island and spent a week there.
奥陶纪时期，本区处于北为汉南古陆与巴山隆起，南为广阔的陆表海盆地的古地理环境。
The natural geography of the Ordovician period is that: the Hannan paleocontinent and the Bashan Mountain rise at the north, and the wide epicontinental sea basin lies in the south.
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