Is it a fossil?

[seelly]

Is this big round thing a fossil? It is next to a rock with fossilized shells I found. 

Where: Las Llajas Canyon, Simi Valley, California - dating back to Eocene Period, known for many fossils as this whole area used to be under water.

Weight: 6.16 pounds 

Thank you

 

 

[trilobites_are_awesome]

Great pictures!

Next to the quarter I see what appears to be shell.

other then that I am seeing no fossils.

[Fin Lover]

Looks geological to me

[seelly]

OK, thank you for checking it out,  I appreciate your help.

[Ludwigia]

Looks very much like just a rock to me, but I couldn't say which type. Maybe someone will come along here who can.

[Baking Geologist]

The rounded rock appears to be quartzite.  
 

The shell is a bivalve, possibly a scallop.  But it’s in bad shape.  

[Danielb]

It the first picture you can see some partial shell fossils possibly brachiopods.

[Fin Lover]

8 hours ago, Danielb said:

It the first picture you can see some partial shell fossils possibly brachiopods.

I think they were just asking about the other item:

On 12/5/2023 at 5:21 PM, seelly said:

Is this big round thing a fossil? It is next to a rock with fossilized shells I found.