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Mainefossils

Fossil forum, 

This is another fossil from the Leighton fm. I have just uncovered it, and at first thought it was a trilobite cheek. On closer inspection I realized that the external and internal mold are not smooth, but appear slightly porous. As well as this, the ridge appears too high in both molds. Any help on its id would be appreciated. Here are some pictures of it (internal mold on the left, external on the right):

1159323607_unknown1.thumb.jpg.ff04efd49a568d4bf7cf0155f74ae61f.jpg     1114706746_unknown2.thumb.jpg.586886eed7fed47ca9acd25492eac7cb.jpg

 

304235230_unknown3.thumb.jpg.36687bbb2dd1c73653aa560bd6ffee8f.jpg

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Fossildude19

Not sure there is enough there to make a determination, but it looks more like where the thorax meets the cephalon

Occipital lobe/or posterior border? 

 

trilomorph2007.gif

Image from Trilobites.info.

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Nautiloid

I agree with Tim that it looks like either a piece of a thoracic segment or the occipital lobe

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Mainefossils

That makes sense. I was really puzzled by the porosity of the surface on the external mold - is that normal?

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1 minute ago, Mainefossils said:

That makes sense. I was really puzzled by the porosity of the surface on the external mold - is that normal?

It is for some species, and for certain types of preservation.

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Mainefossils
33 minutes ago, Kane said:

It is for some species, and for certain types of preservation.

Thank you! 

 

 

 

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