Starfish fossil association ID

[JohnO]

I bought this fossil at a fossil show yesterday. Seller said it was a Starfish from Morocco. He had a few but only this one had another fossil next to it. He didn't know what it was. Does anyone know what is next to starfish? Was he even right about this being from Morocco? Also anyone know what type of starfish it is?

[JamieLynn]

It looks like Favosites coral, but I am not very familiar with Moroccan stuff. Perhaps @Tidgy's Dad can help with that.

The Starfish might be Petraster as it is a common one from Morocco. 

[JohnO]

Thanks for the reply coral makes sense. I couldnt even come up with a starting point to start looking for something similar.  

[Tidgy's Dad]

A lot of starfish from the Ordovician of Morocco are labelled "Petraster". but they often look very different to each other, so for me this is Asteroidea indet. 

Sometimes the starfish are found with edrioasteroids and cystoids, but I'm not sure this is a cystoid.

Maybe some form of algal colony?  

[JohnO]

Thank you so much for the info, was so clueless about what other lifeforms have been found along side them . The only ones I've every come across were starfish by themselves or in groups.