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Echinoids And Finds Frome The Big Hole


Fossil Foilist

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Found alot of stuff this last trip. here is some pics of the finds. :D :eat popcorn:

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Fossil Foilist
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looks like a real productive site FF, sweet echs!!!

"Your serpent of Egypt is bred now of your mud by the operation of your sun; so is your crocodile." Lepidus

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Wow! That's a lot of echies!

That dark colored one(Sweet!) is a HONKER!

Nice finds!

Thanks for posting them.

Regards,

    Tim    -  VETERAN SHALE SPLITTER

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"In every walk with nature one receives far more than he seeks."

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That sure is a lot of echinoids. Just curious, what is the "star" shaped pattern on some of the echinoids? What purpose does it serve in real life? Is that part of the echinoid the "top" or "bottom"?

Daryl.

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That sure is a lot of echinoids. Just curious, what is the "star" shaped pattern on some of the echinoids? What purpose does it serve in real life? Is that part of the echinoid the "top" or "bottom"?

Daryl.

Great fossils. I'm jealous. I don't know much about the fossil echinoids but I'm trying to learn more. Isn't this forum great?

On many living echinoderms, especially the sand dollars and a few urchins, the star-shaped pattern on the top of the animal is made by tiny holes which lead to modified tube feet. On the seastars, and many sea urchins, the tube feet are on the bottom (oral) surface, along the sides of an ambulacral groove. (The feet make the animal ambulatory, hence the name.) On modern sand dollars the ambulacral area, with modified tube feet, is found in a star-shaped petal pattern on the top surface of the animal's "test". In modern sand dollars, these modified feet are actually respiratory organs, and not for locomotion. \

Thanks for sharing your excellent finds!

Mike

Start the day with a smile and get it over with.

 

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Noticed several fossils with (drilled holes) parasite attacks

Which holes? Are those periproct holes (anus)?

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Hi,

The mouth is always under the sea urchin, and often in the center. The periproct (anus) is the other one !

coco

----------------------
OUTIL POUR MESURER VOS FOSSILES : ici

Ma bibliothèque PDF 1 (Poissons et sélaciens récents & fossiles) : ici
Ma bibliothèque PDF 2 (Animaux vivants - sans poissons ni sélaciens) : ici
Mâchoires sélaciennes récentes : ici
Hétérodontiques et sélaciens : ici
Oeufs sélaciens récents : ici
Otolithes de poissons récents ! ici

Un Greg...

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None of these echies look cretaceous. Am I wrong?

They are Hardouinia mortonis and Hardouinia kellumi. They are late Cretaceous from the Peedee Formation.

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Hi,

The mouth is always under the sea urchin, and often in the center. The periproct (anus) is the other one !

coco

You are right, of course, Coco, that the mouth is always on the bottom. Many of the echinoids in these photos also show a hole at the top, where the anus (and the madreporite) had been when the animal was living. I am curious, though, about the holes in the sides of many of these fossils. These might be the holes that Indy noticed too. They look like holes made by a predatory gastropod, but I've never seen that in modern urchins. Does anyone know if these are part of the original structure of the animal? Some modern sand dollars have holes from top to bottom, but of course they are much more compressed than the urchins.

Edit: OK, I should have looked this up before I wrote the message above. I see that these critters have periprocts on the side, and that's what the holes are. The live urchins I'm familiar with have them at the top. Fossils rule!

Edited by Pagurus

Start the day with a smile and get it over with.

 

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The echnoids you find in your pit are amazing. You have a great spot for hunting there, if you ever need any company I am sure one or two of us from a little further up the coast would be more than glad to make sure you don't get bored!!! :P :P :P

Bulldozers and dirt Bulldozers and dirt
behind the trailer, my desert
Them red clay piles are heaven on earth
I get my rocks off, bulldozers and dirt

Patterson Hood; Drive-By Truckers

 

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The echnoids you find in your pit are amazing. You have a great spot for hunting there, if you ever need any company I am sure one or two of us from a little further up the coast would be more than glad to make sure you don't get bored!!! :P :P :P

Yep. I'd like to find a few nice ones. I have a few from a sand pit, but they are in poor shape.

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