Pseudorthoceras???

[Nimravis]

I am again going through thing that I have in my collection and came across this little thing and I am thinking that it may be a Pennsylvanian cephalopod, maybe Pseudorthoceras. I do not know the location that it came from and I am guessing that it is Pennsylvanian. Any help would be appreciated.

 

 

[Tidgy's Dad]

That's a really nice specimen. 

I would say, yes, Pseudorthoceras, as the other orthocones I know of from the Pennsylvanian of the USA (if it is Pennsylvannian) all seem to be shorter and squatter. like Mooreoceras or Brachycycloceras.

But I'm a bit out of date these days. 

[Nimravis]

13 minutes ago, Tidgy's Dad said:

That's a really nice specimen. 

I would say, yes, Pseudorthoceras, as the other orthocones I know of from the Pennsylvanian of the USA (if it is Pennsylvannian) all seem to be shorter and squatter. like Mooreoceras or Brachycycloceras.

But I'm a bit out of date these days. 

Thanks Adam.

[doushantuo]

Revision_of_some_common_Carboniferous_genera_of_No.pdf

From 2005,but BK keeps revising species

 

from his 2004 JOP paper:

[doushantuo]

jp_78_03.pdf

outtakes above&below

Nice /instructive to see that Branco,Philippi and Hoernes had the right ideas in the earliest part of the previous century:early ontogeny counts bigtime

[doushantuo]

from:

 

R.H.Flowers old-fashioned thorough study of the Pseudorthoceratacea(link above)

edit (hours later):sorry,but I thought it wise to mention it is a large download(34,8 Mb or htereabouts)

From a while ago though(1939),so beware!!

[Nimravis]

@doushantuo you can always be counted on for good info- much appreciated.