Fish bone or tectonics??

[hauyn888]

Yesterday a collague found while he was fishing in a little river nearby Koblenz called ´Nette´ this plate. The slate or greywacke is devonian age. The first time when I saw the pics yestrerday on whatsapp I was really exhausted - maybe a big fish - something like Dunkleosteus or something like this. But today I got the plate, cleaned it and now I think that he found some tectonic marks or microtectonic structures - perhaps somebody has seen something like this before - I´m happy for some further informations ....

thanks 

Chris

[Rockwood]

1 for tectonics

[ynot]

Looks like quartz veins - so agree with tectonic.

[Wightlight]

Looks like a mineral vein (quartz?)

 

Picture from here: https://natureinfocus.blog/2017/12/30/polurrian-rocks-3/

Edited August 6, 2018 by Wightlight

[hauyn888]

Thanks for the comments, they support my guess