Hello, everyone. I'm studying an Aptian shallow marine succession (Western Tethys) and I have come across this strange structure in one of my samples. I originally thought it was some kind of serpulid colony, but it seems radically different from the serpulid remains that commonly occur in other samples. Me and my colleagues are at a loss...

For context, this sample was taken towards the top of a shallowing-upward sequence, near a sequence boundary with subaerial exposure.

Can somebody shed some light on the subject? :-)

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