What is rather amazing, you might think, is how similar some images are, whether you're looking at a rock face in South Africa or standing inside a cave in Spain.
可能更令人惊讶的是,某些图像的相似度非常高,不管是看南非的石像面具,还是身处西班牙的岩石洞穴里。
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Belknap discovered the bone while identifying the contents of ancient human feces excavated from a lower layer at a rock shelter known as Hinds Cavein Texas.
That fall into the cave happened 1.977 million years ago, according to dating based on the rate of decay of uranium in the rock layer that holds the fossils.