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Matthew Gramling posted a new activity comment 2 years, 11 months ago
2 years, 11 months ago2 years, 11 months agoGreetings @diane-soderman ! These appear to be mineral intrusion into a porous rock matrix. Possibly silica crystals like quarts, but it’s difficult to tell for sure.
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Matthew Gramling posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months agoGreetings@diane-soderman ! I agree with @mackenzie-ross-2 about those being a sedimentary rock. Also, if you are in Kingsbury County then you are in the Pierre Shale Formation. The Pierre Shale covers most of eastern SD and in primarily marine late Cretaceous sediments. Ferruginious nodules, like the one you found, are common in the PSF. I have…[Read more]
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Matthew Gramling posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months agoGreetings @diane-soderman ! As @leonardo-miranda said fossils can be a number of different colors depending on the kind of matrix and mode of their preservation. I will say that depending on where you are collecting in South Dakota the fossils will likely match the common colors of the sediments of the geological formation you’re at. If you want…[Read more]
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Matthew Gramling posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months ago@diane-soderman Another rock, probably quartzite or quartz.
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Matthew Gramling posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months agoGreetings @diane-soderman ! This looks like an iron nodule and possibly ferruginious sandstone.
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MacKenzie Smith posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months ago@diane-soderman and @mackenzie-ross-2 I agree with @bill-heim that there is wood in the second picture. I also think that there is wood impression in the first. But because there is no cellular detail we won’t know what type of plant it was.
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Mackenzie Ross posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months ago@diane-soderman@mackenzie-smith might be able to help identify if this is petrified wood!
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Mackenzie Ross posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months agoHi @diane-soderman this might just be a sedimentary rock. Do you have any more specific location information? This can help with ID!
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Sam Ocon posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months agoHi, @Diane-Soderman, could you use https://macrostrat.org/map/#/z=1.5/x=16/y=23/bedrock/lines/ to learn more about how old this is and what geological units it comes from?
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MacKenzie Smith posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months ago@i-edwards and @diane-soderman Yep. I think it could be either bone or wood. It’s entirely replaced so there’s no structure to go off of.
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Sam Ocon posted a new activity comment 3 years, 7 months ago
3 years, 7 months ago3 years, 7 months agoHi all! @Diane-Soderman, Macrostrat might be a useful tool if you are trying to figure out the age of this specimen: https://macrostrat.org/map/#/z=1.5/x=16/y=23/bedrock/lines/