Mignoffo Posted September 1, 2015 Share Posted September 1, 2015 These two rocks were collected grin the Rock River in Ogle County, Illinois. Near the popular road exposure of platteville limestone. The first i was wondering if it could be a pygidial spine from a Gabriceraurus trilobite? Second is a good sized impression roughly 5 cm. I blew it off as a cephalopod but my son really wants me to find out if it could be a good sized trilobite in the same genus. Link to comment Share on other sites More sharing options...
Raggedy Man Posted September 1, 2015 Share Posted September 1, 2015 (edited) First photo is definitely a trilobite pygidium(nice one too). The other one is highly worn. Best regards, Paul Edited September 1, 2015 by Raggedy Man ...I'm back. Link to comment Share on other sites More sharing options...
ZiggieCie Posted September 1, 2015 Share Posted September 1, 2015 I think 2 & 3 are a cephalopod. Link to comment Share on other sites More sharing options...
Raggedy Man Posted September 1, 2015 Share Posted September 1, 2015 I agree with Ziggie on 2 and 3. ...I'm back. Link to comment Share on other sites More sharing options...
snakebite6769 Posted September 1, 2015 Share Posted September 1, 2015 One is a ceraurus pygidium, and two and three, I would agree are worn cephalopod. Cool finds! Link to comment Share on other sites More sharing options...
Guguita2104 Posted September 1, 2015 Share Posted September 1, 2015 I agree with others...2 is an external mold and 3 an internal mold of a Paleozoic orthocone (straight-shell cephalopod). Link to comment Share on other sites More sharing options...
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