Sydneylh Posted March 22, 2015 Posted March 22, 2015 (edited) So I came across this while hiking along a reservoir (Polk county, Iowa) a few days ago. I'm not sure if they are any type of fossil or imprint of something or possibly caused from some type of water movement cycle? Any help would be great! Oh, the rock is about the size of my hand...Thanks! - Syd Edited March 22, 2015 by Sydneylh
Auspex Posted March 22, 2015 Posted March 22, 2015 They are surely something...what is their size? "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease!
Sydneylh Posted March 22, 2015 Author Posted March 22, 2015 They are surely something...what is their size? here is an image of the rock with a standard size sharpie marker.
Auspex Posted March 22, 2015 Posted March 22, 2015 Here's a wild guess: A weathered section through a straight-shelled cephalopod. The ridges could be the chamber septa, the solid red lines mark the edges of the tapering shell, and the dotted line is the siphuncle. Maybe. That's just what struck me while trying to make something of it. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease!
Sydneylh Posted March 23, 2015 Author Posted March 23, 2015 Here's a wild guess: A weathered section through a straight-shelled cephalopod. ~.jpg The ridges could be the chamber septa, the solid red lines mark the edges of the tapering shell, and the dotted line is the siphuncle. Maybe. That's just what struck me while trying to make something of it. That's a pretty great guess! Now I'm even more curious to find out what it could be!
Jeffrey P Posted March 23, 2015 Posted March 23, 2015 At first I was thinking maybe part of a trilobite thorax, but now I'm leaning towards a straight-shelled nautiloid (cephalopod). Either way, something new for the collection. Congrats!
Sydneylh Posted March 23, 2015 Author Posted March 23, 2015 I cam across this image of a trilobite. Do you think mine resembles some of that?
JimB88 Posted March 23, 2015 Posted March 23, 2015 I believe Auspex is right on; its a straight shelled cephalopod impression. A good find in any case!
bone digger Posted March 23, 2015 Posted March 23, 2015 Here is a site that lists some fossil localities in Iowa and what is found there. Maybe it will help you identify your fossil or help you find more! http://fossilsites.com/STATES/IA.HTM
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