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Heavy nondescript fossil from Oakville, Canada


markjw

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This is bigger than a softball and heavy. I found it in the mud alongside 16 Mile Creek in Oakville, Ontario, Canada, an area that has few fossils.
I presume it is a petrified marine animal, with some kind of holdfast portion at the upper part in the photos.

Can anyone help with a more detailed guess?

aBigHeavyFossil.jpg

aTopPortion.jpg

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A few more angles and something for scale might help. I suspect that this will be a rugose coral, and that the lines you can see running down the sides are septa

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Thanks for insights colleagues. I'll see if I can conjure up some other angles and a size reference.

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A couple more photos from different angles would still be useful to confirm or refute my first impression.

 

Don

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Not sure what it is but the age of the bedrock at Oakville is Ordovician, if that helps.

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