Fossil id (Calvert MD)

[Tyrannosaurus-wreck]

Hi! First, thank you to everyone who responded to my older post asking for fossil hunting tips- I used as many as I could and I found some great stuff! 

Here's what I found and can't ID myself from my latest trip to Flagponds (Calvert MD). I was thinking 11 might be snaggletooth shark, and 19 and 20 looked like they might be from some kind of white shark though I'm not entirely sure? In addition to those I'm especially interested in identifying 1, 3, 4, 5, 8-9, and 13 but haven't been able to so far. I'd appreciate any help identifying these and the other teeth I have pictured! 36-48 are possible bones and bone fragments which I thought might have some potential for ID. If different angles or views are needed for any of these I'm happy to take more pics! Lighting in my house isn't ideal so these are the best I could do without taking pics of each bone/tooth individually. 

Oh they posted all out of order, sorry about that! 

[Tyrannosaurus-wreck]

Forgot to include these guys! 

[jikohr]

Nice!

1 and 11 are Hemipristis curvatus 11 is an upper and 1 is a lower

5 and 9 are Tiger shark genus Galeocerdo, I'm thinking aduncus

47 and 39 appear to be ray teeth most likely Aetobatus but I need photos from different angles to be sure.

The other teeth appear to be a mixture of lemon and genus carcharhinus teeth which are a giant pain to tell apart

14 13 and 18 are kinda interesting looking, the stout root and prominent nutrient groove makes me think hammerhead but you might want to wait for a second opinion.

The big thing in your second post looks like it's probably a piece of whale bone, but I'll need several angles to be sure.

 

Hope that helps!

[Tyrannosaurus-wreck]

53 minutes ago, jikohr said:

Nice!

1 and 11 are Hemipristis curvatus 11 is an upper and 1 is a lower

5 and 9 are Tiger shark genus Galeocerdo, I'm thinking aduncus

47 and 39 appear to be ray teeth most likely Aetobatus but I need photos from different angles to be sure.

The other teeth appear to be a mixture of lemon and genus carcharhinus teeth which are a giant pain to tell apart

14 13 and 18 are kinda interesting looking, the stout root and prominent nutrient groove makes me think hammerhead but you might want to wait for a second opinion.

The big thing in your second post looks like it's probably a piece of whale bone, but I'll need several angles to be sure.

 

Hope that helps!

This is super helpful,  thank you!! That's cool about 1 and 11, I found an H. serra as well so that makes 3 hemipristis! Here are some more angles of 47, 39 and the big piece. I did think 47 was some kind of mouthplate, just wasn't sure from what  

[jikohr]

Now that I'm seeing more angles, I'm not sure what that first one is.

The second is a mouth plate from Aetobatus

the other one that I though was a bone is a rock.

[Coco]

Hi,

 

About Hemipristis, H. curvatus is known to the Eocene while in the tags it is inscribed Miocene. I am thinking more about H. serra for the two teeth indicated.

 

Coco

Edited August 30, 2021 by Coco

[jikohr]

1 hour ago, Coco said:

Hi,

 

About Hemipristis, H. curvatus is known to the Eocene while in the tags it is inscribed Miocene. I am thinking more about H. serra for the two teeth indicated.

 

Coco

Curvatus is found in the Miocene pretty frequently actually. I see it all over the east coast.

Also if you look at the lower you can see serrations (or what's left of them) all along it. Serra lowers typically don't have them that pronounced and except a few cusps at the base.

The upper one is pretty curved and has a wide root as one of the root lobes is still there, typical for curvatus not so much for serra.

I attached pics of an upper and lower serra from and an upper curvatus all found at bone valley, Florida which is Miocene.

Edited August 30, 2021 by jikohr
left out something

[bthemoose]

I would call those Hemipristis serra as well. I’m not aware of H. curvatus being reported from the Miocene-aged Calvert Cliffs. The amount of curve, serrations, root, etc. of H. serra teeth all change based on tooth position, as well as I’m sure just normal variation between individuals.

 

Elasmo.com lists H. curvatus as an Eocene to Early Oligocene species and H. serra as Late Oligocene to Neogene.

[Coco]

I agree with @bthemoose

 

Coco

[jikohr]

9 hours ago, bthemoose said:

I would call those Hemipristis serra as well. I’m not aware of H. curvatus being reported from the Miocene-aged Calvert Cliffs. The amount of curve, serrations, root, etc. of H. serra teeth all change based on tooth position, as well as I’m sure just normal variation between individuals.

 

Elasmo.com lists H. curvatus as an Eocene to Early Oligocene species and H. serra as Late Oligocene to Neogene.

Just checked elasmo, you're right it's serra.

Thanks for correcting me!

 

[Coco]

Bonjour,

 

 

Coco