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...

ichnogenus, Undichna; the term "undichna" is composed of the words: 'und'–'ichna', for "wave-trace". At present, the oldest known Undichna were made by...

†Uncinulina lunata – type locality for species †Undichna †Undichna britannica †Undichna simplicitas †Urba – type locality for genus †Urba punctata –...

†Therates – type locality for genus †Treptichnus †Undichna †Undichna britannica †Undichna simplicitas †Urba – type locality for genus †Walchia †Wilkingia...