Spreite

Spreite (or spreiten in German) are tabular, curved laminae that are characteristic of certain trace fossils. They are formed by invertebrate organisms tunneling back and forth through sediment in search of food. The organism moves just enough on each back-and-forth pass so that it avoids reworking a previously tunneled area, thereby insuring that...
Found on http://en.wikipedia.org/wiki/Spreite
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