这一切都是在2004年9月到2005年3月的时间范围内发生的。
The time frame within which all this occurred was from September 2004 to March 2005.
这些变化在现代观测短时间范围内几乎是看不见的，而且，有人认为，这些变化常常被不完善的化石记录中的无数空白所掩盖。
Such changes are all but invisible over the short time scale of modern observations, and, it is argued, they are usually obscured by innumerable gaps in the imperfect fossil record.
同时，牲畜和人类的行动范围都受到了更大的限制，在很长一段时间内都要待在离永久水源更近的地方。
At the same time, both cattle and humans were more confined in their movements, staying much closer to permanent water supplies for long periods of time.
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