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Undichna simplicitas : ウィキペディア英語版 | Undichna simplicitas
''Undichna simplicitas'' is a fish-fin, or fish-swimming fossil trackway left as a fossil impression on a substrate; this type of fossil is an ichnofossil, and in this case an ichnospecies. The ichnogenus for the fish-fin, or fish tracks is named ''Undichna''. Fossil trackways of ''Undichna simplicitas'' have been found in Alabama, USA, in the Pottsville Form, (Westphalian A, Upper Carboniferous, coal mine and tailings); also Indiana, Kansas, and Spain, (El Montsec and Las Hoyas). ==See also==
*Fossil trackway *Trace fossil
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