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Could this be a trilobite fossil


MoRockHunter

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Found this yesterday at a creek in brown spring missouri and wonder if it was from a trilobite possibly?

And also was hoping to find out what this other piece of rock is because I find little ones often but never found one this big?

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What age are the rocks? My wild guess is Ordovician. Looks like possibly Isotelus thoracic segments or possibly even Gonioceras.

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The smaller one looks like a rugosa coral cross section. I lean towards trilobite on the other, but not enough present for me to say for sure. Figure 6. A-B, F-W: Breviphrentis cf. superstes sp. nov. Poty & Denayer. A: specimen PAULg-Sivry 66B/II from the Souverain-Pré Formation, Sivry, Belgium, transverse section IIa. B: Specimen PAULg-Sivry 66B/IV, transverse section IVa. F: Specimen PAULg-Badon/2 from the Souverain-Pré Formation, Badon, Belgium, transverse section 2b. G-H, N: Specimen PAULg-Badon/9, G: Transverse section 9c. H: Transverse section 9b. N: Transverse section 9e. I: Specimen PAULg-Badon/5, transverse section 5a. J-M, O-R: Specimen PAULg-Avesnes 50/75 from the Sains Formation, Avesnes-surHelpe, Avesnois, North France. J: Transverse section b. K: Transverse section c. L: Transverse section d. M: Transverse section f. O: Transverse section h. P: Transverse section i. Q: Longitudinal section e. R: Transverse section g. S-W: Specimen PAULg-Avesnes 57/50 from the Sains Formation, Avesnessur-Helpe, Avesnois, North France. S: Transverse section e. T: Transverse section d. U: Transverse section f. V: Transverse section g. W: Transverse section b. C-E: Catactotoechus sp. from the Souverain-Pré Formation (Upper marginifera Subzone), specimen PAULg-Chev.1993/1/I from, Chevetogne, Belgium. C: Transverse section Ic. D: Transverse section Ib. E: Transverse section Id. A-F: x4, scale bar : 2.5 mm, G-W: x2, scale bar: 5 mm. 

From semantic scholar

 

 Mike

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Not looking like a trilobite to me. 
But I'd be in your boat too, posting it on the fossil forum. If I was in my favorite site, I would guess it was a crab apron. <_<

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Before going any farther in my post, remember that I am a newbie in the identifying game when it comes to fossils.  My idea is undoubtedly way off as at this point, I still go primarily by matching fossils to images and then going from there.  That being said...:fear:

 

Is it possible that it is an impression fossil of some sort of plated mollusk similar to the image below.  The following image is from http://www.lakeneosho.org/Ozarks/fossils.html which is actually about Ozarks Paleontology.

 

18B.jpeg

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It is a chiton. Have a look on my signature (PDF library 2).

 

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...

Badges-IPFOTH.jpg.f4a8635cda47a3cc506743a8aabce700.jpg Badges-MOTM.jpg.461001e1a9db5dc29ca1c07a041a1a86.jpg

 

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