人类社会行进到今天,人类对自身的发展已有不少的认识。但考古学家们在自己的考古探索中还在不断提出一些新的问题,其中一些嵌在岩石当中的古人类足迹就已足够让科学家们绞尽脑汁、皓首穷经了。上亿年前的脚印1968年6月,在美国犹他州羚羊泉,当探险者用地质锤轻轻敲一块石片,奇 Human society has traveled to this day, and human beings have got a lot of understanding of their own development. However, archaeologists are still constantly asking new questions in their own archaeological exploration. Some of the ancient human footprints embedded in the rocks are sufficient for scientists to rack their brains. Hundreds of millions of years ago, the footprints in June 1968, in the United States Utah antelope Springs, when explorers gently knock a stone with a geological hammer, odd