tkvancil
fully equipped rock polisher
Member since September 2011
Posts: 1,548
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Post by tkvancil on Sept 12, 2015 11:27:20 GMT -5
One of Illinois finest. A lot of the chert around here contains fossils. Mostly sponge spicules and crinoid stems but other surprises can be found as well. This one came from Sanauk Creek in DeKalb County Illinois. I think it's a cephalopod?  |
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Post by jakesrocks on Sept 12, 2015 16:57:38 GMT -5
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Deleted
Deleted Member
Member since January 1970
Posts: 0
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Post by Deleted on Sept 12, 2015 18:40:48 GMT -5
Looks shrimpy to me.
Perhaps amphipod is another path to follow
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Post by paulshiroma on Sept 15, 2015 7:53:53 GMT -5
Outstanding piece. That's a great find.
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Post by Noosh9057 on Sept 15, 2015 7:55:55 GMT -5
Nice.
Roger
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inyo
noticing nice landscape pebbles
Member since September 2014
Posts: 85
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Post by inyo on Sept 17, 2015 9:07:12 GMT -5
Looks superficially to demonstrate cephalopodic exterior ornamentation, admittedly; appears contorted horizontally by extensional quasi-metamorphic processes. Surficial rocks exposed in DeKalb County, Illinois, are exclusively Cambrian, Ordovician, and Silurian in geologic age. Since a crinoid ossicle is obviously preserved along with the mystery specimen, the rock is certainly of either Ordovician or Silurian age--too early for the cephalopod ammonoids and ammonites, whose paleontologic remains first appear in the geologic record during the mid Devonian and early Jurassic, respectively. If of genuine cephalopodic molluscan affinity, your mystery specimen would necessarily, therefore, be a nautiloid cephalopod.
One of my pages: A Visit To Ammonite Canyon, Nevada |
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Fossilman
Cave Dweller 
Member since January 2009
Posts: 20,718 
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Post by Fossilman on Sept 17, 2015 12:15:04 GMT -5
SCORE!!!!
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