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Malcolmt

First Phyllocarid

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Malcolmt

I spent the day Friday hunting for Eurypterids. I was pleasantly surprised when I found what I believe to be the tail and last segment of a phyllocarid. Definately looks like the picture in my book "Fossil Ecosystems of North America" This was found in Bertie Dolestone of the Williamsville formation. This is late Silurian in age. Based on the commonest phylocarid in this formation being ceratiocaris acuminata, I suspect that is what I have here. The tail spike appears to be adjsacent to the last segment which is outlined with a black fine sharpie. The tail section itself is 67 millimeters in length. Basically unprepped just a quick dust to get some of the crud off.

post-4886-0-37191000-1333392556_thumb.jpg

Here is a close up of the tail

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Here is a diagram I found

post-4886-0-13116600-1333394290_thumb.jpg

Edited by Malcolmt

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Auspex

That's a BIG one! Congratilations!

Compare with Peter's: LINK

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Malcolmt

Yes the tail on Peter's is tiny by comparison...

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Missourian

Very cool.

Here's a Pennsylvanian phyllocarid telson for comparison:

post-6808-0-16016100-1333416484_thumb.jpg

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Malcolmt

Again very small by comparison

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Missourian

Again very small by comparison

I should take another look at my concretions. What I thought were fish spines very well could be pieces of large phyllocarids.

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