The Burgess Shale Faun1

The Burgess Shale Faun1 - distinguishing characteristics...

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The Burgess Shale Fauna The Burgess deposits also yielded the oldest representative of the phylum Chordata, a small fossil known as Pikaia . Most specimens of Pikaia are between one and one and a half inches long. Chordates, the phylum to which humans belong, has three
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Unformatted text preview: distinguishing characteristics, all of which are present in Pikaia . The extant animal known as a lancet bears at least a superficial resemblance to Pikaia ....
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