The problem was that while they were well documented at some sites, usually the ones with the very nice animals, there was also a large number of them where it was very vague -- there wasn't a lot of description or detail.
尽管某些遗迹对这些符号进行了很好的记录， 通常是那些发现了漂亮动物图形的遗址， 但相当数量的记录都非常模糊不清， 缺失了大量描述和细节。