Please ID this odd little ball of fossils from Vancouver Island, BC Canada.

[Nomayne]

My mom picked up this oddity of a rock at the mouth of Chemainus River, one Vancouver Island  BC. The River carves away the surrounding sedimentary hills. Is this a part of bivalves or ammonites???

Edited August 24, 2021 by Nomayne
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[Rockwood]

25 minutes ago, Nomayne said:

Is this a part of

Ya. I think it's part of. But what ? Just part of is as far as I get. 

[Ludwigia]

I'd say we're dealing with the outer whorls of ammonites here.

[caterpillar]

Looks like ammonite. Do you know the epoch?

[Rockwood]

Please, no one take me too seriously here. I'm going to just throw out a concept for illustration. It may not be well applied.

Early Jurassic ? Based on the relatively simple (unornamented) shell form.  

[Plax]

I'm seeing ribbed pelecypod steinkern and exterior impression together.

[JamieLynn]

Also thinking bivalve. It looks very similar to a Rastellum carinatum oyster we have in Central Texas Cretaceous. 

 

[fossisle]

Looks to me like a worn Bostrychoceras heteromorph ammonite in concretion

[Wrangellian]

On 8/24/2021 at 5:32 PM, fossisle said:

Looks to me like a worn Bostrychoceras heteromorph ammonite in concretion

I'm always late to the party...

Can you tell me what about it makes it a Bostrychoceras as opposed to Glyptoxoceras, Rick? For years I've been calling these smaller/finer-ribbed ones Glyptoxoceras, but then again Jim Haggart posited Bostrychoceras sp. for a specimen I showed him of the kind that whorls around in a couple of broad circles, so maybe that's it, but I gather the taxonomy is not clearly understood.

[fossisle]

On 8/27/2021 at 2:02 AM, Wrangellian said:

I'm always late to the party...

Can you tell me what about it makes it a Bostrychoceras as opposed to Glyptoxoceras, Rick? For years I've been calling these smaller/finer-ribbed ones Glyptoxoceras, but then again Jim Haggart posited Bostrychoceras sp. for a specimen I showed him of the kind that whorls around in a couple of broad circles, so maybe that's it, but I gather the taxonomy is not clearly understood.

Just my opinion based on the first 2 photos, ribbing doesnt look that fine and the whorl goes on a different plane than Glyptoxoceras. Then again it could be Ainoceras.

[Wrangellian]

I wasn't familiar with Ainoceras but the pics I see in an image search look nothing like this, to me, and I've never found any like it (have you?).

Not sure what you mean about the whorl going on a different plane - it looks flat (not including the other portions visible which could be broken/displaced pieces, no?)

Here's a couple pieces I found a little upstream from there they were... I think theirs is the same as this. But what are these, and are the two pieces the same (marcoconch/microconch?) or different species?

 

[fossisle]

Nice examples of Glyptoxoceras(left) and Bostrychoceras (right)

[Plax]

so are we looking at the living chamber in the OP or do these ammonites not have complex sutures?