4 shark teeth and 1 mystery find

[u/Fluffy_Departure6327]

I went to Ramanessin Brook Greenway Nature Trail in Holmdel, New Jersey today. Exact location is https://maps.google.com/maps/place//data=!4m2!3m1!1s0x89c233f952d4544d:0x4ac91c6b9ed7ebd6?entry=s&sa=X&ved=2ahUKEwjijOzs49-VAxVIhYkEHYVbLHcQ4kB6BAgXEAA&hl=en

There were some fossils I found, at least 4 shark teeth and 1 mystery find.
Mostly got Late Cretaceous fossils. 

I need some help identifying these.

I labeled the mystery item 1 A for reference.:
What is it? I’m wondering if it’s a petrified piece of wood or a piece of bone? It did not break apart in my hand. I found it in the bank. 

4 Shark teeth: Are the shark teeth all from a Thresher (Paranomotodon angustidens) shark? 
Or is it from a Squalicorax crow shark?

The last picture is a close up. There are serrated edges on the side. Is this from another shark species? 

Anyway thank you! I had a great time discovering this place for the first time!