Three methods dating fossils

Posted by / 15-Mar-2018 10:44

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(In fact, even at this length, this post is still only a summary! Marsh published a description of newly discovered horse fossils from North America.

) People who are in a hurry may just want to read the intro and summary and look at the tree. At the time, very few transitional fossils were known, apart from Archeopteryx.

But the 3,500-year-old treasures include their most stunning historical ...(See the horse tree for a lovely ASCII depiction.) Small preface: All equids (members of the family Equidae) are perissodactyls -- members of the order of hoofed animals that bear their weight on the central 3rd toe.(Other perissodactyls are tapirs and rhinos, and possibly hyraxes.) The most modern equids (descendents of Parahippus) are called "equines".All the names on the tree are genus names, so recall that each genus encompasses a cluster of closely related species.The is a brief description of the tree for those who are visually impaired. There are many branches alive during most times until two million years ago when only the various species of Equus remain.

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I apologize in advance for the length; I didn't want to cut it down any more than this, because horse evolution has been oversimplified too many times already.

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