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Malcolmt

Its Not A Eurypterid

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Malcolmt

I was at my usual site near Niagara Falls hunting eurypterids on Friday with two other collecting friends from the USA and although it was not a great day for eurypterids, the day turned out pretty good. As far as eurypterids go all I found was the following specimen but it has excelent paddle preservation that is folded over the body like an egyptian mummy. The coxa from the underside are also folded over and visible which is very unusual for a dorsally preserved specimen.

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What turned out to be the find of the day was that I found a horseshoe crab.

As a pleasant surprise Peter from the forum( Pleecan) showed up just as I found this. Which was fortunate for me as after he ate his lunch he got out his rock and cut both of these out for me. I also have the counterpart to the crab but have not got a picture of it at this point, it is still in the trunk of my car.

This is an order of magnitude rarer than the eurypterids at this site. I am aware of about 50 eurypterids collected this year that were over 80% complete. I am only aware of this and one other horseshoe crab being found this year. The following pictures were taken in situ by a well known and respected collector at this site Sam and are quite hard to see. (Perhaps Peter will do some magic and post an enhanced version.) I was actually quite surprised to have noticed it. It was about 1 foot from the partial eurypterid that is shown above. It was on the same bedding plane as the eurypterid about 1 foot to the southwest. .

This was found in the Williamsville A formation of the Bertie waterlime. So the age is Upper Silurian

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At about 35 millimeters in length I am told that it is very large for this location where they are more normally 10 to 15 millimeters in size.

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My assumption at this point is that it is a Pseudoniscus clarkie Technically it is probably not correct to call it a horseshoue crab. Any other thoughts......

I have also heard of these called bunaia woodwardi but some believe these to be the same species. They are listed as separate in my book Fossil Ecosystems of North America.

Edited by Malcolmt

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erose

That is really cool. Does this quarry produce scorpions?

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Ludwigia

My assumption at this point is that it is a Pseudoniscus clarkie Technically it is probably not correct to call it a horseshoue crab. Any other thoughts......

...Both Pseudoniscus and Mesolimus (the horseshoe crab) are Merostomata belonging to the order of the Xiphocerida, so I think you're allowed to use the term at least in everyday language in the same way as we tend to lump everything that belongs to the subclass of the Ammonoidea under the name Ammonite.

Congratulations on this very rare find! The chances for such a find tend to increase proportionately in relation to the number of visits to a site, and you're getting up there, I would say! The folded up Eurypterid looked to me at first glance like a macrocephalic sitting Buddha sitting on a glass plate and photographed from underneath.

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Bullsnake

Very,very cool Malcolm! Congratulations!

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Scylla

Congrats Malcolm that is a beautiful fossil! Thanks for posting it.

...The folded up Eurypterid looked to me at first glance like a macrocephalic sitting Buddha sitting on a glass plate and photographed from underneath.

Um, yea. It looks like every macrocephalic sitting Buddha sitting on a glass plate photographed from below that I've ever seen. :blink::P

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Ludwigia

Congrats Malcolm that is a beautiful fossil! Thanks for posting it.

Um, yea. It looks like every macrocephalic sitting Buddha sitting on a glass plate photographed from below that I've ever seen. :blink::P

Good to see that you also have a flexible imagination B)

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Herb

Really nice. :envy:

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Missourian

Not a eurypterid.... darn. :) The consolation prize is a rare xiphosuran. Very nice catch.

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Auspex

This is an exciting find! I am very happy for you :)

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Wrangellian

Fascinating... Is this something that you will be able to work your prepping magic on? Can't wait to see the results..

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Malcolmt

Looked at the counterpart today with Peter when we were out hunting. The counterpart is musch better than the picture posted here. The counterpart has some nice detail. The fossil is really very delicate and other than a tiny bit of prep around the margins of the head shield I am not sure at this point that it is worth risking. I will get a better sense when I look at it under a scope this week sometime.

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Fossildude19

Malcolm -

Congratulations on the rare find - your collecting this year has been truly impressive.

Regards,

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trilobiteruss

Congrats on an awesome find

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Shamalama

Wow! that is really cool looking. Glad your hard work paid off again. :)

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pleecan

Malcolm: I would just leave it... the carapace is ultra thin... the air abrasion unit may cause damage.

PL

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Quarryman Dave

Darn! it sounds like I missed a terrific outing. Is it possible that the horseshoe crab could be a trilobite?

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Malcolmt

No it is definately a horseshoe crab , the counterpart that I will try to take a picture of today makes it quite obvious.

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pleecan

Reprocess Malcolm pics...

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