这些裂缝的活动在大约2.5-2.45亿年前，即中生代初期逐渐停止了。
The rift development slowly halted some 250 to 245 million years ago, around the beginning of the Mesozoic Era.
中生代是由恐龙主宰的世界，尽管哺乳动物也在距今2亿年前的化石记录中出现。
The Mesozoic saw the ascendence of dinosaurs, although mammals also appear in the fossil record about 200 million years ago.
云南楚雄盆地位于扬子陆块的西南边缘，为一典型的中生代周缘前陆盆地。
The Chuxiong basin in Yunnan on the southwestern margin of the Yangtze landmass is a Mesozoic peripheral foreland basin.
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