Nautiloid size : 4.1cm X 3.7cm (1.61" X 1.46")
Origin : Fall River county, South Dakota, USA
I looked through the websites recommended by some very kind fossil collectors. However, identifying an Eutrephoceras still a difficult task for me even with references; they all look pretty much the same, ie. E.elegans and E.dekayi. Here's some link to Eutrephoceras references that I mentioned.
E.elegans WMNH - Ammonites
E.dekayi 1: http://www.yale.edu/ypmip/taxon/ceph/30394.html
E.dekayi 2: http://www.clemson.edu/public/geomu...phalopods/nautiloid_eutrephoceras_dekayi.html
Both of the E.dekayi seems a little different from its suture but they are the same species; i'm confused and I still had a few Eutrephoceras to be identified.
Can someone tell me what species is this nautiloid? Many thanks to those who contribute~
Origin : Fall River county, South Dakota, USA
I looked through the websites recommended by some very kind fossil collectors. However, identifying an Eutrephoceras still a difficult task for me even with references; they all look pretty much the same, ie. E.elegans and E.dekayi. Here's some link to Eutrephoceras references that I mentioned.
E.elegans WMNH - Ammonites
E.dekayi 1: http://www.yale.edu/ypmip/taxon/ceph/30394.html
E.dekayi 2: http://www.clemson.edu/public/geomu...phalopods/nautiloid_eutrephoceras_dekayi.html
Both of the E.dekayi seems a little different from its suture but they are the same species; i'm confused and I still had a few Eutrephoceras to be identified.
Can someone tell me what species is this nautiloid? Many thanks to those who contribute~