Paleonet: Unusual trace fossil

David Kopaska-Merkel davidkm at
Thu Jul 16 00:22:32 GMT 2015

Undichna, and Tony Martin at Emory is something of an expert. See a few examples here: and


David C Kopaska-Merkel
Geological Survey of Alabama
Box 869999
Tuscaloosa AL 35486-6999
fax 205-349-2861
From: Paleonet [mailto:paleonet-bounces at] On Behalf Of Carl Mehling
Sent: Friday, July 10, 2015 8:32 AM
To: PaleoNet
Subject: Re: Paleonet: Unusual trace fossil

Undichnia is the most common ichnogenus for fish swimming traces. I think that would explain the parallel sinuous trails. But the circular impressions are anomalous!

-----Original Message-----
From: Paleonet [mailto:paleonet-bounces at] On Behalf Of Tony Wright
Sent: Friday, July 10, 2015 7:36 AM
To: 'PaleoNet'
Subject: Re: Paleonet: Unusual trace fossil

Hi Paul,

This is way out of my field, but the sinuous trace you showed immediately reminded me of something Ross Parkes showed me at Quidong in late Silurian rocks. He said the trace was caused by a fish! I had no reason to doubt him, but have really nothing to add. The parallel lines do nothing for me. I'm not sure where Ross ended up, perhaps at CSIRO or GA in Canberra. Someone at Macquarie might know if you want to contact him. It will be interesting to see what responses you get. One of our UoW PhD graduates (Kerrie Bann,

kerriebann at<mailto:kerriebann at>) would be my first stop for either an answer/opinion or guidance, but she probably does not do paleonet.



-----Original Message-----

From: Paleonet [mailto:paleonet-bounces at] On Behalf Of Paul Blake

Sent: Thursday, 9 July 2015 5:26 PM

To: 'PaleoNet'

Subject: Paleonet: Unusual trace fossil


I have an unusual trace fossil and I am wondering if people know what may have made it.  Photo 1 is a picture of the outcrop.  On the left you can see a sinuous trail and on the right is trail made up of two parallel lines then a circular impression followed by two parallel lines and a circular impression etc.  Picture 2 shows a close up of the trail.  The parallel lines are approximately 7cm long.  The trail continues for about 40m and crosses itself in at least one place

The trail is from the late Permian part of the Bowen Basin in Queensland, Australia and the environment is interpreted to be a shallow muddy river.

Any information on what type of creature may have made the trail would be appreciated.


Paul Blake


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