butchndad Posted September 22, 2020 Share Posted September 22, 2020 I am clueless as to what this is (more so than usual). It doesn’t look like the usual concretions. It doesn’t look like the usual shells. It doesn’t look like a fossil and I’ve never seen coral from Big Brook. It’s 1.75 x 1 inch and the bottom is concave Link to comment Share on other sites More sharing options...
martwad Posted September 22, 2020 Share Posted September 22, 2020 That 2nd picture is making me want to say oxidized cast iron. Link to comment Share on other sites More sharing options...
Fossildude19 Posted September 22, 2020 Share Posted September 22, 2020 Slag was my first impression. Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
FossilDAWG Posted September 22, 2020 Share Posted September 22, 2020 I agree with slag. Not a fossil coral for certain. Don Link to comment Share on other sites More sharing options...
The Jersey Devil Posted September 23, 2020 Share Posted September 23, 2020 This is actually Cliona sponge stuck to the remnants of a steinkern of a shell 4 “You must take your opponent into a deep dark forest where 2+2=5, and the path leading out is only wide enough for one.” ― Mikhail Tal Link to comment Share on other sites More sharing options...
Pippa Posted September 23, 2020 Share Posted September 23, 2020 Backside looks like cast iron. Or could be a shell, as The Jersey Devil suggests. I'd hold a magnet to it, see if it reacts. Link to comment Share on other sites More sharing options...
Plax Posted September 23, 2020 Share Posted September 23, 2020 12 hours ago, The Jersey Devil said: This is actually Cliona sponge stuck to the remnants of a steinkern of a shell Shell dissolved away; cliona representation still there as Jersey Devil says. 2 Link to comment Share on other sites More sharing options...
TqB Posted September 23, 2020 Share Posted September 23, 2020 I agree with filled Cliona borings in a dissolved shell. There are infills of the narrow galleries connecting the chambers. 3 Tarquin Link to comment Share on other sites More sharing options...
erose Posted September 23, 2020 Share Posted September 23, 2020 Yep, sponge steinkern Link to comment Share on other sites More sharing options...
DPS Ammonite Posted September 23, 2020 Share Posted September 23, 2020 I agree with Tarquin. This is the infillings of sponge borings that show galleries and interconnected passages such as that from Entobia. It is a trace fossil and not a body fossil. Thus, it is not a steinkern of a body fossil. See: 3 My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
butchndad Posted September 23, 2020 Author Share Posted September 23, 2020 On 9/22/2020 at 1:45 PM, martwad said: That 2nd picture is making me want to say oxidized cast iron. On 9/22/2020 at 1:57 PM, Fossildude19 said: Slag was my first impression. On 9/22/2020 at 2:16 PM, FossilDAWG said: I agree with slag. Not a fossil coral for certain. Don 16 hours ago, The Jersey Devil said: This is actually Cliona sponge stuck to the remnants of a steinkern of a shell 6 hours ago, Pippa said: Backside looks like cast iron. Or could be a shell, as The Jersey Devil suggests. I'd hold a magnet to it, see if it reacts. 4 hours ago, Plax said: Shell dissolved away; cliona representation still there as Jersey Devil says. 4 hours ago, TqB said: I agree with filled Cliona borings in a dissolved shell. There are infills of the narrow galleries connecting the chambers. 1 hour ago, erose said: Yep, sponge steinkern 51 minutes ago, DPS Ammonite said: I agree with Tarquin. This is the infillings of sponge borings that show galleries and interconnected passages such as that from Entobia. It is a trace fossil and not a body fossil. Thus, it is not a steinkern of a body fossil. See: Thank you all. I appreciate your input. Are you sure this is not a dinosaur egg? LOL Link to comment Share on other sites More sharing options...
abyssunder Posted September 23, 2020 Share Posted September 23, 2020 To be honest, I can see the possible variants of your specimen listed, but, probably, I'm not the expert who will be expected to answer to your question. Trace fossils like Entobia might be a good candidate in my thinking. " We are not separate and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way. " Thomas Mann My Library Link to comment Share on other sites More sharing options...
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