Two possible fossils

[Eimaise]

Hello,

I found what I think may be two fossils but I’m not totally sure. I’m really not terribly knowledgeable with all this. The first appears to be a bivalve impression fossil with at least 3 different shell imprints in the sample. I found this rock washed up on the beach at Amelia Island Florida (Atlantic side). It has several nice impressions in it. Is this a legit fossil or do you think something like concrete amalgamation? I don’t know… it just seemed really easy to find. If legit, any guess as to it’s age?

 

The second sample was also found washed up on the beach at Amelia Island Florida.  It looked bony to me based on its appearance and symmetry. Not sure if this represented some sort of fish or whale bone. 
 

Thanks again for any help!

[Thomas.Dodson]

1 hour ago, Eimaise said:

 Is this a legit fossil or do you think something like concrete amalgamation? I don’t know… it just seemed really easy to find. If legit, any guess as to it’s age?

It is legitimate. As for age, that depends on the bedrock it came from. Thankfully, in this day and age most places in the US have had the stratigraphy previously mapped. Here is one for Nassau county. https://ngmdb.usgs.gov/Prodesc/proddesc_27272.htm

 

Based on this map it is likely Miocene to Pleistocene in age. A species might be difficult with the preservation but we have a lot of Florida members here who might be familiar with the area.

 

The second sample looks like an alligator osteoderm.