GuidesMagazineShopBuy FossilsJoin Hunts
Scrumpy
55E93A9A-1223-45A3-9B57-3C6C2E4AEF96.jpeg  77D2212B-A78F-4ECF-A3FD-628BFC976816.jpeg  3BCA59B1-138C-48B2-AA4D-47FA6CD2B085.jpeg  Could someone please ID this ammonite for me it was found on the Holderness coast. It measures 9” across, is 3” wide and it has a very deep center at 2”
Thanks Rob
Quote 0 0
Barrow Museum
That's a super specimen.  My thoughts are that it is a Callovian (late Middle Jurassic) Erymnoceras coronatum or  E. ?argoviense, which occur in the Coronatum Zone, in the lower part of the Oxford Clay down south, but in Yorkshire, it is found in a more sandy facies when in situ.  It looks to have formed in a large mudstone concretion from which either you extracted it, or it was cracked out during transportation with the North Sea ice sheet.  I suspect it originated from somewhere offshore.  Whatever it is, you have a fine addition to your collection.
Quote 0 0
Scrumpy
Thank you very much Barrow Museum
I had a feeling its an erratic as the preservation  is like nothing else I have collected from the Yorkshire coast 
Cheers Rob 
Quote 0 0
TqB
Could it be a Polyptichites from the Speeton Clay? The preservation looks appropriate though I'm no ammonite specialist.
Tarquin
Quote 0 0
Barrow Museum
Tarquin makes a very valid point.  As I mentioned, the matrix wasn't really right for a Northern English Callovian ammonite and I was a bit uncomfortable with the ID.  But Polyptchites from the Speeton Clay, also quite possibly dragged to its location by ice (you don't say where on the Holderness coast it was found) is more than likely, particularly the preservation which is spot-on.  There's one illustrated online which is a dead-ringer...(see photo)


Polyptchites.jpg 
Quote 0 0
estwing
Scrumpy, you are one lucky guy!
That's a beauty!
Quote 0 0
TqB
Polyptichites certainly occurs on the Holderness from time to time (as an erratic, like everything else there), but that is a monster!
Tarquin
Quote 0 0
Write a reply...


Discussions on fossils, fossil hunting, rocks, locations, and identifying your finds.
(C)opyright 2019 - UKGE Ltd and UK Fossils - Contact us