I have see the your message,and i know that this cephalopods are rare in your zone .
I have a old and rare book that is published with alls particular contents,about the cephalopods in the zone of W. of Eocene age.
I write you the title,if you want a copy of this old book,write me and we can,if you want,exchange the copy for some your fossils find,thanks.
The name is :
Palmer K.,
A new nautiloid, Eutrephoceras eyerdami, new species from the Cowlitz formation upper Eocene of Washington.
1961 In 8vo, offp., pp. 4 + 1 tav.