What I like about this cephalopod is that creature's shell is has lots of ridges making it easy to identify. Also it has sinusoidal grow lines that are neat. I think this only the third one I have found so far and maybe the second with the fossilized shell.
This specimen is about 6 cm long but has been dipped or was filled with concrete. Part of its shell is covered or has disintegrated leaving just a molded shape.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg8Xnxarmj-xqZ1WXfr_vYNsSm2XDaHlBhJPAJABkOmyicxsHKpUelB5xpQvd9Ue4hwF8R2o5ARWIP_NYQLhWRxsxsdorodtFGN15mSDzd24epzVLPTinj25_rhU64QgiPMeuzZbccphD7u/s400/Dawsonceras-annulatum.jpg)