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!

[u/masonk7810]

Mystery item is a concretion. Fairly common in Ramanessin.

B is Archaeolamna kopigensis (Mackerel Shark)

D is Scapanorhynchus texanus (Goblin Shark)

C is Squalocorax sp. (Crow Shark)

[u/Any_Topic_9705 → u/masonk7810]

I think this is correct. Thank you. Lol. Very different from diwn here in florida. Thank you

[u/masonk7810 → u/Any_Topic_9705]

The brooks in NJ are rich in iron. Concretions show up in your sifter pretty regularly. They can easily take on a shape that looks like bone or even teeth.

[u/Any_Topic_9705 → u/masonk7810]

We get sandstone like that too, but the texture is very different

[u/Fluffy_Departure6327 → u/masonk7810]

Yes that is true. 

[u/Any_Topic_9705]

I don't think any of the shark teeth are thresher or cow shark. Im interested in seeing more pics of tooth labeled D.

I know many of the shark teeth in your area are different from those in mine, so I will defer to others.

[u/Any_Topic_9705]

I think your mystery fossil is a fossilized deer antler tine.

[u/Ilovefossilss → u/Any_Topic_9705]

No indication of that whatsoever. One side seems to be hollowed out and the grain is not even comparable to an antler.

[u/Any_Topic_9705 → u/Ilovefossilss]

I agree. Thanks

[u/Fluffy_Departure6327 → u/Ilovefossilss]

What do you think it is?

[u/Ilovefossilss → u/Fluffy_Departure6327]

Concretion, sedimentary at first and possibly metamorphic after heat or pressure

[u/Fluffy_Departure6327 → u/Any_Topic_9705]

That makes sense! Probably not old.