Genus from Middle Jurassic - Lusitanian Basin

[JoanaS.]

Had this walk around Mondego Cape and the Serra da Boa Viagem Mountain range, which are close of Murtinheira section, a Global Boundary Stratotype Section and Point from the Aalenian-Bajocian Stage.

This section has argilite, sandstone and limestone, among others.

 

I believe the formation is Cabo Mondego.

 

The area is known by having ammonites like Macrocephalites, which is a bit confusing because the genus I found does look like a shell.

Can you help ID?

Edited November 21, 2024 by JoanaS.

[Fossildude19]

I think some preparation would be required, to hazard a confident guess. 

I do see a possible shell, but can't make out enough detail to say more.

[JoanaS.]

3 minutes ago, Fossildude19 said:

I think some preparation would be required, to hazard a confident guess. 

I do see a possible shell, but can't make out enough detail to say more.

That was my thought but I’m a bit unskilled and afraid to damage it!

 

[Fossildude19]

1 hour ago, JoanaS. said:

That was my thought but I’m a bit unskilled and afraid to damage it!

 

 

Best way to learn is to try. 

Nothing ventured, nothing gained.

[JoanaS.]

29 minutes ago, Fossildude19 said:

 

Best way to learn is to try. 

Nothing ventured, nothing gained.

Oh gosh, but it’s so fragile 

It seems it’ll deteriorate and lose parts, each time one cleans it.

But you have a point!

[Ludwigia]

That's the luck of the game sometimes. Like Tim says, nothing ventured, nothing gained.

[JoanaS.]

59 minutes ago, Ludwigia said:

That's the luck of the game sometimes. Like Tim says, nothing ventured, nothing gained.

So my next question must be, 

any tips to whom seems worried to ‘break’ it? 
Thank you so much!

[Ludwigia]

3 hours ago, JoanaS. said:

So my next question must be, 

any tips to whom seems worried to ‘break’ it? 
Thank you so much!

 

I'd first have a go at the cracks above and then below and around the fossil, tapping a penknife into them carefully using a rubber hammer until the matrix splits away.

[Fossildude19]

[JoanaS.]

On 11/21/2024 at 1:31 PM, Ludwigia said:

 

I'd first have a go at the cracks above and then below and around the fossil, tapping a penknife into them carefully using a rubber hammer until the matrix splits away.

I believe I’ll venture myself, just gaining the momentum to go through this ‘operation’.

I have them both (the tools you’ve mentioned) and I believe that’s actually a great advise.

Much thank you 

[JoanaS.]

On 11/21/2024 at 2:15 PM, Fossildude19 said:

This is such a great help, thank you so much for all this directions and the effort you’ve made, to answer my worries!

Will grab the ‘courage’ and will carefully make the incisions has pointed by you.

 

Meanwhile, one is still looking on this side,

and I found this Mondegia limica, a brachiopoda, that resembles a little with the supposed shell I believe there is.