squalicorax Posted September 23, 2012 Share Posted September 23, 2012 Hey all. My dad found this along the Milwaukee River, not even looking, and gave it to me to figure out what it is. This is Middle Devonian Marine dolomite. I have collected at various other river cuts less than a mile up. Never seen anything like this. The texture is killing me. It looks like it weathered away, with only some of it left exposed, and a cast left. thanks for looking. My Flickr Page of My Collection: http://www.flickr.com/photos/79424101@N00/sets Link to comment Share on other sites More sharing options...
pleecan Posted September 23, 2012 Share Posted September 23, 2012 Quite possible... I am leaning towards a yes..... For comparison... This is protitanichthys placoderm armor from Arkona,Mid Devonian. Link to comment Share on other sites More sharing options...
RCFossils Posted September 23, 2012 Share Posted September 23, 2012 I would agree with Peter. Looks like placoderm material. Great find! Link to comment Share on other sites More sharing options...
Missourian Posted September 24, 2012 Share Posted September 24, 2012 (edited) I think it could be a piece of an eurypterid. Segment detail for comparison: Edited September 24, 2012 by Missourian Context is critical. Link to comment Share on other sites More sharing options...
Auspex Posted September 24, 2012 Share Posted September 24, 2012 I think it could be a piece of an eurypterid. This example is a better match for the 'chevron' pattern of the mystery specimen. "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! Link to comment Share on other sites More sharing options...
pleecan Posted September 24, 2012 Share Posted September 24, 2012 The first photo upper apex suggest bone texture rather than eurypterid chitin ... still think it is placoderm armor of some sort.... not protitanichthys. Suspect if you lift the bone there will be ornamentation raised bumps on the bone structure. The bone should be resistant to acetic acid..... Link to comment Share on other sites More sharing options...
Malcolmt Posted September 24, 2012 Share Posted September 24, 2012 Does not look like eurypterid chitin to me Link to comment Share on other sites More sharing options...
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