Fossil identification from Comox valley

[Martianskyes]

Hi folks, I found these two fragments on the Puntledge River in Courtenay, British Columbia, Canada. These are from shale rock of Upper Cretaceous age. 

 

I think the one on the right might be a heteromorph ammonite and but I have no idea on the left one. Perhaps a thick shell? The pieces are about 5cm in length in the photo. 

 

I would really appreciate any ideas on what type of fossils these are.

 

Cheers,

Martin

Edited September 2, 2018 by Martianskyes

[ynot]

I think the one on the right is a heteromorph, but it could be orthocones also.

The left one looks like a chert nodule. The hollow area could be a fossil, but I am unsure of that. Close ups of that area may help.

[Fossildude19]

The left one looks like it was split and cross sectioned whatever may be there. 

Agree it looks like chert. 

[FossilDAWG]

The specimen on the left is a fragmented inoceramid bivalve in a broken  carbonate nodule.  The fibrous nature of the shell is characteristic of inoceramids.  The one on the right is an impression of a heteromorph ammonite, most likely Glyptoxoceras subcompressum.

 

Don

[Martianskyes]

Thanks very much FossilDAWG for your description. That makes a lot of sense and I have subsequently found more in the river beds since. 

 

Thanks also, ynot and Fossildude19!