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.
砌体房屋顶层墙体在施工或使用初期，顶层墙体往往出现斜向及水平裂缝。
Diagonal and horizontal crack usually appears in the top layer wall of masonry structures building during construction and initial stages of using.
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