Fossil and Cartilage? ID Help Needed

[Out4uv8]

Hello everyone. I just found out about these forums and so trying my luck on a couple mystery pieces that I have. I'm really excited to participate on the forum as we have been hunting for a year and have been on both US coasts, Sharktooth Hill and have had some great finds along the way.

 

Fossil (pictures of the black piece) - My Fiancée found this in Venice, FL a few weeks ago. It is clearly bone based on the side view. The "bottom" side is flat with a couple of "scratches in it". The other side is very clearly ridged with 6 protruding parallel ridges. This piece was broken off on both sides, so I don't know if it had more ridges as a complete piece. Any help would be greatly appreciated. 

 

Cartilage (pictures of the white piece) - (size of a nickel) This is not a fossil and my guess is part of a crab or something similar, but I've been unable to find a graphic to confirm it. It does have small ridges along the top of the "V" and it is not a symmetrical piece.  My guess is this is something that many have seen before and someone will recognize it. 

 

Thank you in advance for the help and support. 

 

Derek and Sarah

[val horn]

The first looks like a fish tail and the second a piece of turtle

 

[Brett Breakin' Rocks]

2 hours ago, Out4uv8 said:

My Fiancée found this in Venice, FL a few weeks ago. It is clearly bone based on the side view. The "bottom" side is flat

Hi there .. these are colloquially called "sand dollar doves" but are actually the functional teeth of the Enchinoderm. 5 jaw sections that resemble "birds" I think that's what I'm seeing in the image. The other black fossil might looks like a bit of turtle shell. 

 

Cheers,

Brett

Edited December 6, 2021 by Brett Breakin' Rocks

[Fossildude19]

I agree with Brett. 

[Out4uv8]

Thank you both! It does look identical to Brett's picture. Very cool. Excited on the turtle shell piece as we have another piece that we were able to more easily identify as turtle shell. Thank you!

 

Derek

[Coco]

Hi,

 

About the 1st pic, these aren't the teeth of a sea urchin per se, but oral parts. I couldn’t find my teeth pictures.

 

Coco

[ClearLake]

Just to add to what others have said, the first one is a part of what is often called the “Aristotle lantern” of sea urchins. Take several of what you found along with some other pieces and it forms the feeding apparatus. See the picture below off the web.