angeb20 Posted July 9, 2018 Share Posted July 9, 2018 I found this yesterday in a field in Southern Central Minnesota. The field borders a prairie pothole lake. I also found a small shell impression in a sedimentary rock there in the past. In the photos there are 2 like impressions that continue around the piece. Appreciate your thoughts. Thank you. Link to comment Share on other sites More sharing options...
GeschWhat Posted July 9, 2018 Share Posted July 9, 2018 I don't know what this is, but it is really, really interesting. I'm thinking it is geological, but there are plenty of people here that know way more than me. Lori www.areallycrappystory.com/fossils www.facebook.com/fossilpoo Link to comment Share on other sites More sharing options...
ynot Posted July 9, 2018 Share Posted July 9, 2018 Welcome to TFF! Can You retake the 3rd picture under better light? Does this "fizz" when You put a drip of vinegar? If yes, what part(s) fizz? I think it is calcite veins with limestone. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
angeb20 Posted July 9, 2018 Author Share Posted July 9, 2018 On the smooth areas it does fizz with vinegar. Here is a hopefully better picture although it is the more grey/white color than the yellowish the sun shows. Thanks! Link to comment Share on other sites More sharing options...
ynot Posted July 9, 2018 Share Posted July 9, 2018 Can You scratch a knife with the rough part? Fizzing indicates limestone for the gray (smooth) areas. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
angeb20 Posted July 9, 2018 Author Share Posted July 9, 2018 The rough part scratches easily with a knife. So, you think that this was a calcite material that settled into a space between a different kind of rock that created a strange pattern? (in a novice nutshell) Link to comment Share on other sites More sharing options...
Paciphacops Posted July 9, 2018 Share Posted July 9, 2018 The rough part looks like it could be gypsum. "Don't force it, just use a bigger hammer" Link to comment Share on other sites More sharing options...
LordTrilobite Posted July 9, 2018 Share Posted July 9, 2018 A very interesting shape. Looks geologic to me too though. Olof Moleman AKA Lord Trilobite Link to comment Share on other sites More sharing options...
fossilized6s Posted July 9, 2018 Share Posted July 9, 2018 2 hours ago, angeb20 said: The rough part scratches easily with a knife. So, you think that this was a calcite material that settled into a space between a different kind of rock that created a strange pattern? (in a novice nutshell) That is correct. Looks like a piece of a giant 'thunder egg' i find. Definitely calcite filled void. ~Charlie~ "There are those that look at things the way they are, and ask why.....i dream of things that never were, and ask why not?" ~RFK ->Get your Mosasaur print ->How to spot a fake Trilobite ->How to identify a CONCRETION from a DINOSAUR EGG Link to comment Share on other sites More sharing options...
angeb20 Posted July 9, 2018 Author Share Posted July 9, 2018 Link to comment Share on other sites More sharing options...
ynot Posted July 9, 2018 Share Posted July 9, 2018 3 hours ago, angeb20 said: The rough part scratches easily with a knife. So, you think that this was a calcite material that settled into a space between a different kind of rock that created a strange pattern? (in a novice nutshell) Limestone (grey parts) is a calcium carbonate. It is easily dissolved by acidic groundwater, leaving voids that can be filled with other minerals. These minerals can be layered (like a cake), and partially or wholly fill the void. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
angeb20 Posted July 9, 2018 Author Share Posted July 9, 2018 Do you think this find is along the same theory? Possibly a rock or petrified wood outer surface filled with a caked sediment.... (found along the same small lake) Thanks again Link to comment Share on other sites More sharing options...
ynot Posted July 9, 2018 Share Posted July 9, 2018 This looks more like a metamorphic sandstone called quartzite. Would like to see some close up pictures of different areas. Also- does it fizz? Can You scratch it with a knife? Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
abyssunder Posted July 9, 2018 Share Posted July 9, 2018 I'm thinking of a partial septarian nodule for the first specimen, considering the double-wall structure. picture from " 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...
ynot Posted July 9, 2018 Share Posted July 9, 2018 12 minutes ago, abyssunder said: I'm thinking of a partial septarian nodule for the first specimen, That does fit well with the piece. Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
angeb20 Posted July 9, 2018 Author Share Posted July 9, 2018 1 hour ago, ynot said: This looks more like a metamorphic sandstone called quartzite. Would like to see some close up pictures of different areas. Also- does it fizz? Can You scratch it with a knife? The outside of my 2nd piece is very hard and the inside is a much softer material like it settled there. I will try for closer pics, my camera hates close up pics though. I think I agree on quartzite.... Link to comment Share on other sites More sharing options...
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