巨大岩石上留有脚印三叶虫化石留有脚印地质学家看到脚印我们知道,人类的出现是200~300万年前才有的事情,可一些考古学家在他们的研究过程中,却在两亿年前的化石上发现了人类的足迹,而且脚印上还带着鞋子!这让所有人都大为吃惊。是谁留下了这些脚印呢?难道两亿年前还有人类活动的足迹吗?于是,有人提出了大胆的设想。在现有人类之前,地球上会不会曾经活跃过另一个人类文明?毕竟我们的地球母亲拥有45亿年的高龄,而人类的历 Footprints leave on huge rocks Trilobite fossils leave footprints Geologists see footprints We know that the appearance of mankind is only 2-3 million years ago, something that some archaeologists in their study, but Humans were surprised at the discovery of human footprints on fossils 200 million years ago, with shoes on the footprints! Who left these footprints? Did there still be a footprints of human activity two hundred million years ago? So, some people put forward bold ideas. Before the present mankind, will Earth have ever been active in another human civilization? After all, our Mother Earth has 4.5 billion years old, while the human calendar