渐新世
渐新世（Oligocene）是地质时代中古近纪个最后一个主要分期，大约开始于3400万年前，终于2300万年前，介拉始新世（Eocene）搭新近纪个中新世（Miocene）之间。比起其他比较古老个地质时期，用岩床来确认渐新世比较准确，但精确个起始搭结束辰光仍弗确定。
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