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Came across this specimen on an Ohio Fossils group. It was apparently found in south-central Ohio (Serpent Mound area) in 1958. What’s bothering me is that it seems to be a marine pelecypod with aragonitic preservation. All of Ohio’s exposed rocks are either Paleozoic or Pleistocene, and with vanishingly few exceptions, Paleozoic aragonite is simply not preserved. I know there are mollusks in pleistocene marine concretions, notably from Newfoundland, but not in the sediments representing Pleistocene Ohio’s terrestrial&freshwater environments. This is a marine clam, and there was no marine environment in pleistocene Ohio. Nor were there marine environments producing concretionary fossils in any nearby source area for glacial debris that ended up in Ohio, as far as I am aware. Nor in any of the Ohio River’s past source areas to the south during the Pleistocene. So....is this concretion then an object moved long distances by ancient humans? Does anyone recognize the concretion as similar to ones they’ve seen in some particular Formation? Or am I way off in terms of my preservational logic? Original post: “I collected this 60+ years ago from a tributary stream to the Miami River in SW Ohio - what is it and how old? Opinions please!”

DBNA Middle and Upper Devonian Cryptodonta (Bivalvia)from the Pelagic Hercynian Facies -Taxonomy, Stratigraphy, and Paleoecology Judith Nagel Inaugural dissertation,2006 ABOUT 5,8 MB the research areas on a Devonian geodynamic reconstruction :

Help request! I am putting together a tool for judging rock age based on very crude, whole-rock, hand-sample observations of fossil faunas/floras -- the types of observations a child or beginner could successfully make. I view this as a complement to the very fine, species-level identifications commonly employed as index fossils for individual stages, biozones, etc. Attached is what I've got so far, but I can clearly use help with corals, mollusks, plants, vertebrates, ichnofossils, and the post-Paleozoic In the attached file, vibrant orange indicates times in earth history to commonly observe the item of interest; paler orange indicates times in earth history to less commonly observe the item of interest. White indicates very little to no practical probability of observing the item of interest. Please keep in mind that the listed indicators are things like “conspicuous horn corals,” purposefully declining to address rare encounters with groups of low preservation potential, low recognizability, etc. Got additions/amendments, especially for the groups mentioned above? Toss them in the comments below! Thank you..... https://docs.google.com/spreadsheets/d/1tVm_u6v573V4NACrdebb_1OsBEAz60dS1m4pCTckgyA

Disentangling the history of complex multi-phased shell beds based on the analysis of 3D point cloud data Mathias Harzhauser, Ana Djuricic,Oleg Mandic,Martin Zuschin,Peter Dorninger,Clemens Nothegger,Balázs Székelyb,Eetu Puttonen,Gábor Molnárb,Norbert Pfeifer Palaeogeography, Palaeoclimatology, Palaeoecology Volume 437, 1 November 2015, Pages 165-180 1-s2.0-S0031018215004149-main.pdf taxa concerned: Paroxystele amedei (Brongniart, 1823) r Superfamily: Neritoidea Rafinesque, 1815 Agapilia pachii c Nerita plutonis (Basterot, 1825) f Superfamily: Cerithoidea Férussac, 1821–1822 Ptychopotamides papaveraceus (Basterot, 1825) f Granulolabium bicinctum (Brocchi, 1814) r Turritella gradata (Hörnes, 1856) r Oligodia bicarinata (Eichwald, 1830) r Petaloconchus intortus (Lamarck, 1822) c Superfamily: Calyptraeoidea Lamarck, 1822 Calyptraea depressa (Lamarck, 1822) f Calyptraea irregularis (Cossmann & Peyrot, 1919) f Superfamily: Velutinoidea Gray, 1840 Erato sp. r Superfamily: Naticoidea Guilding, 1834 Polinices pseudoredemptus (Friedberg, 1923) f Neverita josephinia (Risso, 1826) r Superfamily: Muricoidea Rafinesque, 1815 Ocenebra crassilabiata (Hilber, 1879) c Ocinebrina striata (Eichwald, 1853) c Janssenia echinulata (Pusch, 1837) r Nassarius edlaueri (Beer-Bistricky, 1958) f Cyllenina suessi (Hoernes and Auinger, 1882) c Tudicla rusticula (Basterot, 1825) c Superfamily: Cancellariidae Forbes and Hanley, 1851 Solatia exwestiana (Sacco, 1894) r Superfamily: Conoidea Rafinesque, 1815 Perrona semimarginata (Lamarck, 1822) r Perrona louisae (Hoernes and Auinger, 1891) r Perrona vindobonensis (Hörnes, 1854) r Class: Cephalopoda Cuvier, 1795 Aturia aturi (Basterot, 1825) r Class: Bivalvia Linnaeus, 1758 Superfamily: Gastrochaenoidea Gray, 1840 Rocellaria dubia (Pennant, 1777) r ok,am quitting the italics for once Superfamily: Arcoidea Lamarck, 1809 Anadara diluvii (de Lamarck, 1805) r Superfamily: Limopsoidea Dall, 1895 Glycymeris deshayesi (Mayer, 1868) r Superfamily: Mytiloidea Rafinesqe, 1815 Perna aquitanica (Mayer, 1858) f Septifer oblitus (Michelotti, 1847) r Superfamily: Pteriidae Gray, 1847 Isognomon soldanii (Deshayes, 1836) r Superfamily: Pectinoidea Rafinesqe, 1815 Pecten styriacus (Hilber, 1879) r Aequipecten macrotis (Sowerby in Smith, 1847) r Superfamily: Anomioidea Rafinesque, 1815 Anomia ephippium Linnaeus, 1758 r Superfamily: Ostreoidea Rafinesque, 1815 Crassostrea gryphoides (Schlotheim, 1813) f Ostrea digitalina (Dubois de Montpereux, 1831) f Superfamily: Lucinoidea Fleming, 1828 Loripes dujardini (Deshayes, 1850) r Megaxinus incrassatus (Dubois de Montpereux, 1831) r Diplodonta rotundata (Montagu, 1803) r Superfamily: Chamoidea Lamarck, 1822 Pseudochama gryphina (Lamarck, 1819) r Superfamily: Cardioidea Lamarck, 1809 Cardium hians (Brocchi, 1814) Acanthocardia paucicostata (Sowerby, 1839) f Superfamily: Mactroidea Lamarck, 1809 Ervilia pusilla (Philippi, 1836) r Superfamily: Solenoidea Lamarck, 1809 Solen marginatus (Pulteney, 1799) c Superfamily: Tellinoidea de Blainville, 1814 Tellina planata (Linnaeus, 1758) r Superfamily: Veneroidea Rafinesque, 1815 Cordiopsis islandicoides (Lamarck, 1818) r Venerupis basteroti (Mayer, 1857) f related editorial note: GEOSPHERE is a free access publication;the link is quite long,and i noticed i got the message : session timed out so: a slightly more indirect way of pointing the way: https://pubs.geoscienceworld.org/gsa/geosphere/article/12/5/1457/189679/high-resolution-3d-surface-modeling-of-a-fossil High-resolution 3D surface modeling of a fossil oyster reef Ana Djuricic Peter Dorninger Clemens Nothegger Mathias Harzhauser Balázs Székely Sascha Rasztovits Oleg Mandic Gábor Molnár Norbert Pfeifer Geosphere (2016) 12 (5): 1457-1477. WARNING: 45 MB

DIJK John.D.Taylor and Emily A.Glover Hanging on-lucinid bivalve survivors from the Paleocene and Eocene in the Western Indian Ocean(Bivalvia:Lucinidae) Zoosystema,2018/v.40-7 about 6.2 MB RECOMMENDED! New genus: Retrolucina(previously Eomiltha) http://zoobank.org/urn:lsid:zoobank.org:act:DAFC3EBA-0C19-4D63-8248-65A6F761670A

Hi, I come here because I need some help. I just collected samples for my thesis and I´ve just realized that my samples are sandstones with many mollusca fossils. My problem here is that, I dont know how to extract the fossils without destroying them. Please help me, I need this so much, and I cant find anything about dissolving sandstones. Greetings From Monterrey, México.

i consider this one "informative" ,and then some(NO hint intended,BTW) tidalflatichnolcarbonif.pdf