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Monica

Hi everyone!

 

I found this piece yesterday at my new spot along Etobicoke Creek here in Mississauga, Ontario (Georgian Bay Formation, Upper Ordovician).  It's a bryozoan of some sort with some crinoid stems on it, along with an imprint that I think is either a Cruziana ichnofossil or a weathered crinoid stem imprint - what do you all think?  I've boxed the imprint in red.

 

Thanks in advance!

 

Monica

 

Views of the imprint:

DSC02438.thumb.JPG.017e06ca4b2dc1107dd14d68492c6e3b.JPGDSC02439.JPG.afc11961133f40a191ef266bf9cccebf.JPG

 

View of the other side of the rock/bryozoan:

DSC02440.JPG.99fb9da6ee88e081cde4d84a3ef0a703.JPG

 

Close-up of the bryozoan:

DSC02442.thumb.JPG.1380a1a55b9d9575550da6426a269e79.JPG

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digit

Yup. My thoughts as well. Of course, I must preface that with mentioning that neither cruziana nor crinoids are found in Florida (our surface geology doesn't go back even a fraction of the necessary age). The symmetry seemed much too consistent with the lines aligning on either side too perfectly to be cruziana. Mike's photo above is much more what I'd expect from the scurry of little feet. :)

 

 

Cool fossil association.

 

 

Cheers.

 

-Ken

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Fossildude19

What is the size of the imprint, Monica?

Can we get a straight on shot of the imprint?

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Tidgy's Dad

I would also lean towards crinoid. :)

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Monica

Hi guys - thanks for your input!

 

Tim @Fossildude19 - here is another picture of the imprint:

DSC02449.thumb.JPG.0687068be3fb0cf0ac210b47627c32d9.JPG

Re: size - it's about 3 cm long and 0.5 cm wide.

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Tidgy's Dad

Hmmm. 

I have to say it doesn't look very much like a crinoid in the new piccie. :headscratch:

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Fossildude19
8 minutes ago, Monica said:

Hi guys - thanks for your input!

 

Tim @Fossildude19 - here is another picture of the imprint:

DSC02449.thumb.JPG.0687068be3fb0cf0ac210b47627c32d9.JPG

Re: size - it's about 3 cm long and 0.5 cm wide.

 

 

Thanks for the pic and measurements, Monica. 

With this, I would lean towards a crinoid imprint as well - measurements are well within crinoid range.

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Monica

First of all, a big thank-you to everyone who has looked in and given their thoughts re: the identity of this unknown item - I really do appreciate it!!!

 

I was doing a little internet research and am wondering if rather than Cruziana (furrowing behaviour), could this be a Diplichnites (walking/striding behaviour)?  Or, of course, it might still be a crinoid imprint!  The reason why I'm still looking into things is because the specimen in question appears to be raised in the centre (see photos below) which is a bit odd.  However, perhaps this raised area can be attributed somehow to the underlying bryozoan?

 

Here are a few more photos of the item...

 

The first two photos show what the imprint/trace looks like from the side.  The red arrows indicate where the indentations/"tracks" are - notice that the imprint/trace is raised in the centre:

DSC02458.thumb.JPG.f1983849c1962e5b7a1c7ba4a69b69c7.JPGDSC02459.thumb.JPG.c0baf619f02997b4532b27f930e5cdaf.JPG

 

This is just another photo of the imprint/trace with my thumb/hand for scale:

DSC02460.thumb.JPG.65830519a1b6e74270d4a69d4118837c.JPG

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