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Unusual California Land Fossils!

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Greetings everyone.  I am from Northern California.  All of the mineral specimens and fossils that I dig up come from the same general area.  But it is a complex geological zone, where the Sierra Nevada, the Cascades, the Modoc plateau, and the Basin and Range all  sort of come together.  I'm going to be posting a series of sets of photos for your enjoyment, but primarily for my education..  I'm hoping to get some help identifying as many fossils in these photos as possible..  I figured I would start with some challenging ones.  This first set of photos shows what I am ninety-nine percent sure are land living organisms ( the reason I know this is because I find Leaf fossils in the same Rock ( I'll be posting pictures of those in another set of photos).  For size reference, the black objects in these photos are not very large ranging between centimeter or two 2 an inch or so in length...  The host rock is a silica-rich jasper-like material that has a hardness of 7 and breaks with a conchoidal fracture.  I'm looking forward to hearing what you all think about these.  Thanks for your time!








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I agree with DPS Ammonite.
The last one is a good match for an individual Macginicarpa globose fruiting head.
For detailed descriptions of the inflorescences/infructescences see these documents :
Steven R Manchester. Vegetative and reproductive morphology of an extinct plane tree ( Platanaceae) from the Eocene of western North America ( USA). Botanical Gazette 147(2):200-226.1986. https://www.researchgate.net/publication/280895976_Vegetative_and_reproductive_morphology_of_an_extinct_plane_tree_Platanaceae_from_the_Eocene_of_western_North_America_USA


1986 Macginitiea.jpgPigg & Stockey 1991 Platanaceae.jpg


Kathleen B Pigg, R. A Stockey. Platanaceous plants from the Paleocene of Alberta, Canada. Review of Palaeobotany and Palynology, 70 (1991): 125-146. https://www.researchgate.net/publication/223539580_Platanaceous_plants_from_the_Paleocene_of_Alberta_Canada


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