Curious finds

[Shellseeker]

Some more items that I found last Sunday with out with @DirtyHippie and @jcbshark..Had a few questions...

 

Much of this went into the collection bag,  with the view that I would figure it out later... I had previously found many rostral teeth in the Peace River of different types.  I only have one bigger than this one.  The grove on the bottom identifies the genus as Pristis and I thought it was P. lathami. What's confusing me is that P. lathami seems restricted to Eocene/Oligocene but I have found many in the Peace River.  So my question is what species of Sawfish possesses this tooth.  I also found the 1/2 Sawfish vert,  which I previously believed to be P. lathami.  I added to the photo a P. lathami Vert that I found years back in the Peace River for comparison purposes. I'm just a little confused about the age of the Sawfish fossils I found last Sunday....

 

There is another oddity in this last photo...

 

That 1st photo made me think Echinoid... Is this an Echinoid.. I have found pieces and a very few whole) Sand Dollars in the Peace River... never one of these.  I guess it might be a Tillybone.  Curious.  Please let me know what you think..   Jack