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More from France

Joined
Apr 8, 2004
Messages
602
hi all, here's another couple of the same species from down my way of the west coast of France. From the same site as my previous Oxycerites orbis & Oppelia aspidoides , therefore Bathonien unless you use Phil's timeline where they'd be from last weekend :razz: !

The good one is 100mm, 10cm, 0.1m or 4" in dia & exactly how it popped from a big rock. The other with the centre whorls missing has been hacked to free the calcite middle, as the rest were mashed, but it turned out that the centre had already gone :cry: . The backside was eroded out & home to a rather large hidden ragworm

Now it's your go Phil to tell me what it is as it ain't in me book !

Keef

 

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neuropteris

GPO
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Joined
Jun 25, 2004
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141
Great finds! Makes me want to pick up the hammer and get out there again - I've not been out looking for ammonites for ages. Haven't a clue on Bathonian ammonites myself so have you any ideas on species yet?

Andy
 
Joined
Apr 8, 2004
Messages
602
hi Andy, as Kevin & Phil gargle omega 3, I'd thought I'd leave it to them, test their powers of deduction & earn their considerable Tonmo salaries :twocents: !

Keef
 

AndyS

Cuttlefish
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Joined
Apr 13, 2004
Messages
27
Spartacus,

Oppelia aspidoides is from the upper Bajocian, if your other ammonites are from the same layer they could be Bigotites sp.

AndyS
 
Joined
Apr 8, 2004
Messages
602
hi Andy (S), confusion reigns ! I'm gonna bin my Vendée geo guide as I see where you're coming from, in it Oppelia is dated Bathonien !
Herve Chatelier also throws up Bajocisphinctes as another deadringer that would fit possibly ?
I may have to switch to stamp collecting as my head hurts.

Keef
 

Phil

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Nov 19, 2002
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spartacus said:
...earn their considerable Tonmo salaries :twocents: !

Er....as in $0?

Great finds as ever, Lord Spart.

Well having learnt a lesson or two in the past couple of years, I'm not going to spend two hours trying to work out what it could be and then get it completely wrong. To be honest, I have not got a clue what is!

According to my copy of Paleobase, Oppelia was confined to the Bajocian, i.e 176.5-169.2 mya. Not that's much help to you, mind.

As an Oppelia fact-o-bite, Hewitt in 1993 studied growth rates in Oppelia, and using growth increments in the jaws determined that they probably reached maturity in a year. This is the same as most living cephalopods which reach sexual maturity in a year or two, spawn, and abruptly die.

P.S. Don't knock gargling Omega 3. It's more fun than googling it.
 
Joined
Apr 8, 2004
Messages
602
hi guys ! you still not being paid then ?
Checked out Bigotites & it seems well to porky in the thickness dept. Bajocisphinctes is spot on proportionally but what do I know in comparison with Tonmo's three Magi ?
There again Prorsisphinctes does the job too, not forgetting Leptosphinctes & a host of others :cry:
I'll just catalogue it as an ammonite methinks :bonk:
 

Architeuthoceras

Architeuthis
Staff member
Moderator
Joined
Nov 19, 2002
Messages
2,445
It looked to me like Stemmatoceras of the family Stephanoceratidae :oops: but with a closer look I saw the constrictions so placing it in the family Perisphinctidae is best. Still dont know what genus.

What is Omega 3 ?
 

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