Possible fin from unknown period

[Alexthefossilfinder]

Hey everyone,

I have this fossil I found along a beach when I was a kid. Unfortunately, I have no knowledge as to where I found it, other than it was an Ontario provincial park. I suspect it's a fish fin from either the Silurian or Devonian, but I want to get the thoughts of someone who knows more on fauna of this time. Thanks!

 

Ps. There's a little something on the side of the rock that may help with id, it's in the second pic. Looks to me like a part of a plant.

[Microraptorfan]

looks to be a coral

[Fossildude19]

+1 for Rugose coral.

Definitely not a fish fin.

 

Cropped, and backlit:

 

 

 

[Scylla]

I agree rugose coral, also called horn coral. Nice find!

[Alexthefossilfinder]

44 minutes ago, Fossildude19 said:

+1 for Rugose coral.

Definitely not a fish fin.

 

Cropped, and backlit:

 

 

 

Alright I did some research and I can now see it. Before I thought the lines went across horizontally, I didn't know they could also go vertical. You learn something new every day!

[Alexthefossilfinder]

18 minutes ago, Scylla said:

I agree rugose coral, also called horn coral. Nice find!

Thank you! I have another that I found I believe in the same trip that's the top section of the coral that's really cool! Any idea what the spiky thing could be?

[Scylla]

What spiky thing?

[Alexthefossilfinder]

18 minutes ago, Scylla said:

What spiky thing?

In the second picture. It's on the side of the same rock.

[Thomas.Dodson]

48 minutes ago, Alexthefossilfinder said:

In the second picture. It's on the side of the same rock.

You mean this? This is the septum from the calyx of a horn coral. I suspect it is the top of the one in the first picture.

[Scylla]

On 10/13/2022 at 12:58 AM, Thomas.Dodson said:

You mean this? This is the septum from the calyx of a horn coral. I suspect it is the top of the one in the first picture.

I agree

[Fossildude19]