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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@rhonda-ellis Sorry, this is a rock. If you see shell or a repeating pattern, then it’s probably a fossil.
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@gail-chapman@corinne-daycross Chances are this came from a Pennsylvanian formation in the Douglas Group. This appears to be Alethopteris though Pecopteris can’t be ruled out entirely. I doubt there is any venation preserved but that would differentiate the two. It is not Sphenopteris because the pinnules are not lobed and it is not Neuropteris…[Read more]
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@rhonda-ellis Sorry, it’s a rock.
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@charles-du Yes. To my knowledge, both Lepidodendron and Sigillaria have Stigmaria type roots. Both are scale trees and lycopods with Lepidodendron having rhomboid leaf scars and Sigillaria having hexagonal leaf scars.
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@charles-du It’s a stem of some sort. Sadly, I can’t tell of what.
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@marion-marshall Very nice specimen!
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@jami-kerr I believe there is a branching bryozoan stem in the upper right and a crustose bryozoan in the center.
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@charles-du Yes! Stigmaria. Another one of those morphogenera where each organ gets ots own name. This name applies to the roots of scale trees (Lepidodendron).
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@charles-du These are great by the way. Enjoying this!
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@charles-du So the name given to this would be Artisia. It is the pith cast (inner part of the stem) of an early (but fully) seed plant called Cordaites. Plant fossil nomenclature is weird because we don’t always know what stem goes with what leaf or reproductive part and so although from the same plant, each organ gets its own genus (generic) name.
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@charles-du Ah, sorry just saw the comment. Yes, that is correct!
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@charles-du Calamites
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@charles-du Yes! 😁
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@charles-du What are the dimensions? I’m leaning towards some sort of stem but a Cordaites leaf is possible. This is too early for palm (palms evolved during the Cretaceous).
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MacKenzie Smith joined the group The Etches Collection – Museum of Jurassic Marine Life 2 years, 4 months ago
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Charles Du and MacKenzie Smith are now friends 2 years, 4 months ago
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months agoSorry @rhonda-ellis this is not a fossil.
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months agoSorry @rhonda-ellis these look like rocks.
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MacKenzie Smith replied to the topic Unidentified leaf – green river formation in the forum What Is It? 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months ago@scott-johansen@a-trilobite @corine Thank you for bringing this to my attention! I did not know what this was either and so I showed the picture to my advisor. This is a leaf from a plant called Quereuxia though it has also been referred to as Trapago in the literature. The name Quereuxia has priority though. It’s an aquatic flowering plant that…[Read more]
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MacKenzie Smith posted a new activity comment 2 years, 4 months ago
2 years, 4 months ago2 years, 4 months agoSorry @kim-sanders this is a rock.
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