SamiCG Posted January 23, 2021 Share Posted January 23, 2021 This was found on the banks of a river bed around Locust Fork River in Blount County Alabama 1 Link to comment Share on other sites More sharing options...
Rockwood Posted January 23, 2021 Share Posted January 23, 2021 Not really petrified wood, but definitely a plant fossil. It appears to be either a pith cast, or an external mold, in a really cool looking concretion. 2 Link to comment Share on other sites More sharing options...
LabRatKing Posted January 23, 2021 Share Posted January 23, 2021 Wow. Very cool specimen! Link to comment Share on other sites More sharing options...
Kato Posted January 23, 2021 Share Posted January 23, 2021 Indeed a neat find! I occasionally find similar appearing concretions but never with a fossil! Link to comment Share on other sites More sharing options...
SamiCG Posted January 24, 2021 Author Share Posted January 24, 2021 2 hours ago, Rockwood said: Not really petrified wood, but definitely a plant fossil. It appears to be either a pith cast, or an external mold, in a really cool looking concretion. Thank you Rockwood!! Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 24, 2021 Share Posted January 24, 2021 Nice specimen, indeed. The concretion itself is an ironstone concretion, mainly composed of the iron mineral siderite (FeCO3). This mineral weathers / oxidizes to brown iron hydroxides ("limonite", roughly FeO(OH)) or red iron oxide (hematite, Fe2O3). Typical and indicative for siderite concretions is the conchoidal spalling due to volume loss during weathering. Franz Bernhard 3 Link to comment Share on other sites More sharing options...
SamiCG Posted January 24, 2021 Author Share Posted January 24, 2021 11 hours ago, FranzBernhard said: Nice specimen, indeed. The concretion itself is an ironstone concretion, mainly composed of the iron mineral siderite (FeCO3). This mineral weathers / oxidizes to brown iron hydroxides ("limonite", roughly FeO(OH)) or red iron oxide (hematite, Fe2O3). Typical and indicative for siderite concretions is the conchoidal spalling due to volume loss during weathering. Franz Bernhard FranzBernhard, I appreciate this immensely. This explanation is much more informative than it looks. I love learning this way. ☺️ Link to comment Share on other sites More sharing options...
SamiCG Posted January 24, 2021 Author Share Posted January 24, 2021 Thank you so much to all who have responded thus far. So much easier to learn as an adult sometimes. ☺️ My rock hound has been collecting rocks since he had pants with pockets and I have always wanted to log and confirm best I can to make him a proper collection or get close to it. You all are informative so much so I don’t need a geology degree to understand and I truly appreciate that. I love the hunt I have been on these last couple days. Your responses have lead me on some fascinating information. I am so glad I found this forum. 1 Link to comment Share on other sites More sharing options...
FranzBernhard Posted January 25, 2021 Share Posted January 25, 2021 9 hours ago, SamiCG said: Thank you so much to all who have responded thus far. So much easier to learn as an adult sometimes. ☺️ My rock hound has been collecting rocks since he had pants with pockets and I have always wanted to log and confirm best I can to make him a proper collection or get close to it. You all are informative so much so I don’t need a geology degree to understand and I truly appreciate that. I love the hunt I have been on these last couple days. Your responses have lead me on some fascinating information. I am so glad I found this forum. Your comment is highly appreciated, thank you! Franz Bernhard Link to comment Share on other sites More sharing options...
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