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Showing results for tags 'cretaceous'.
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Oyster Lopha bellaplicata Eagle Ford Formation
JamieLynn posted a gallery image in Member Collections
From the album: Texas Cretaceous Fossils: Oysters
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Hello, Does this look like a mosquito in burmese amber? I see the huge proboscis which should be the diagnostic feature to distinguish between other similar insects.
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From the album: My collection in progress
Cassiope pizcuetana Villanova 1859 Location: Teruel, Spain Age: 121 - 113 Mya (Aptian, Early Jurassic) Measurements: 9,6 cm Kingdom: Animalia Phylum: Mollusca Subphylum: Conchifera Class: Gastropoda Subclass: Caenogastropoda Superfamily: Cerithioidea Family: Cassiopidae-
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Early (Early) Maastrichtian fossils - late Cretaceous the Netherlands
Fossilsforever posted a topic in Fossil Hunting Trips
Hello all, Found some nice fossils. Around Vaals in Limburg (the Netherlands), Cretaceous sediments occur. The Kalksteen van Vijlen (Vijlen chalk), Orsbach Kreide (Orsbach chalk) and Kunrader Kalksteen (Kunrader chalk) or Vetschauer Kalksteen are present. Fossils from these sediments consist of belemnites (Belemnella (Pachybelemnella) sumensis (Jeletzky, 1949) and/or Belemnella (Pachybelemnella) cimbrica (Birkelund, 1957), some forms are described as Belemnella ex gr. sumensis/cimbrica and Belemnitella sp.), sea urchins (Echinocorys sp. including Echinocorys scutata (Leske, 1778) and Cardiaster granulosus (Goldfuss, 1829), oysters (Pycnodonte vesicularis (Lamarck, 1806), shark teeth (for example Carcharias sp., Cretalamna lata (Agassiz, 1843) and Pseudocorax affinis (Münster in Agassiz, 1843) and other fossils. Many fossils are from the Vijlen Chalk (early Early to early Late Maastrichtian). Fossils from the Vijlen 0-3 and Vijlen 4-6 (Vijlen chalk) are approximately between 70.6 and 69.3 million years old (the basis of interval 0 of the Vijlen Member could be dated at 70.6 Ma). Lithology and bioclast contents for intervals 5 (upper part) and 6 of the Vijlen Member at Mamelis (Mamelis 62D-78) have indicated an age of 69.7-69.3 mya. Including the latest part of the late late Maastrichtian (Formatie van Maastricht), fossils can be between 70.6 and 66 million years old. Internet https://www.somniosus.be/Homepage_set.htm Literature Birkelund, T. (1957). Upper Cretaceous belemnites from Denmark. Det Kongelige Danske Videnskabernes Selskab, Biologiske Skrifter, 9, 1–69, Copenhagen. Christensen, W.K. (1995). Belemnitella from the Upper Campanian and Lower Maastrichtian chalks of Norfolk, England. Special Papers in Palaeontology, 51, 1-84. London. Felder, P.J. & Bless, M.J.M. (1994). The Vijlen Chalk (early Early to early Late Maastrichtian) in its type area around Vijlen and Mamelis (southern Limburg, The Netherlands). Annales de la Société géologique de Belgique 116: 61–85. Felder, W.M. & Bosch, P.W. (2000). Geologie van Nederland, deel 5. Krijt van Zuid-Limburg. NITG TNO, Delft/ Utrecht: 192 pp. Jagt, J.W.M. (2005). Stratigraphic ranges of mosasaurs in Belgium and the Netherlands (Late Cretaceous) and cephalopod-based correlations with North America. Netherlands Journal of Geosciences. 84. 10.1017/S0016774600021065. Jagt, J.W.M. (2012). Belemnitellid coleoids (Mollusca, Cephalopoda) from the type Maastrichtian, the Netherlands and Belgium. Scripta Geologica. Special Issue, 08, 93–112. Jagt, J.W.M, & Jagt-Yazykova, E.A. (2012). Stratigraphy of the type Maastrichtian – a synthesis. Scripta Geologica. Special Issue, 08, 5–32. Keutgen, N., Jagt, J.W., Felder, P., & Jagt-Yazykova, E. (2010). Stratigraphy of the upper Vijlen Member (Gulpen Formation; Maastrichtian) in northeast Belgium, the southeast Netherlands and the Aachen area (Germany), with special reference to belemnitellid cephalopods. Geologie En Mijnbouw, 89, 109-136. Jeletzky, J.A. (1949). Über den taxonomischen Wert einiger morphologischer Elemente des Rostrums der belemnitellenartigen Formen (Familie Belemnitellidae Pavlow, 1913), sowie über die Gattung Belemnella (Nowak, 1913,subg.) Jeletzky, 1941, ihre Phylogenie und einige Vertreter.Neues Jahrbuch für Mineralogie, Geologie und Paläontologie, B9, 257–287. Keutgen, N. (2011). The belemnite zonation of the uppermost Cretaceous in the Maastricht-AachenLiège, Brabant-Méhaigne and Mons areas (Belgium, southeast Netherlands). In: Jagt, J.W.M., Jagt-Jagt. Belemnitellid coleoids from the type Maastrichtian. Scripta Geol., Spec. Issue 8 (2012). Keutgen, N. (2018). A bioclast-based astronomical timescale for the Maastrichtian in the type area (southeast Netherlands, northeast Belgium) and stratigraphic implications: The legacy of P.J. Felder. Netherlands Journal of Geosciences, 97(4), 229-260. doi:10.1017/njg.2018.15 Nestler, H. (2002). Die Fossilien der Rügener Schreibkreide (4. überarbeitete und erweiterte Auflage). Die Neue Brehm-Bücherei Bd. 486., Hohenwarsleben (Westarp Wissenschaften-Verlagsgesellschaft mbH). Schulz, M.G. (1979). Morphometrisch-variationsstatistische Untersuchungen zur Phylogenie der Belemniten-Gattung Belemnella im Untermaastricht NW-Europas. Geologisches Jahrbuch, A47, 3–157. Van der Ham, R. & van Birgelen, M. (1992). Zeeëgels uit het Maastrichtien van de Schneeberg en omgeving (Aken, Duitsland). Natuurhistorisch Maandblad, 81(8/9), 139–153.
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- belemnites
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Extinct Big Water Predator Insect, Chresmodid, in Burmite?
Biotalker posted a topic in General Fossil Discussion
Chresmodidae are a family of insects that reigned from Middle Jurassic to Late Cretaceous. They are medium to large insects with very long legs and superficially resemble extant water striders. While they were common in water environments, like Daohugou, they are exceedingly rare in land environments like burmite. They are puzzling critters, since scientists suggest it is unlikely these weighty insects had the buoyancy necessary to be water surface predators like water striders (Gerridae, Hemiptera). These are samples of Daohugou Chresmodid fossils.
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- burmite
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Jurassic/Cretaceous fossils? (sponge/bryozoan/crinoid)
IsaacTheFossilMan posted a topic in Fossil ID
My better half has just rediscovered some of her old fossils from years ago - as such, she does not know the provenance, though based on the matrix and preservation, I believe them to be Cotswoldian in origin - Jurassic, Inferior/Greater Oolite. These two in particular absolutely had us stumped - This is number one - I originally thought disarticulated crinoid, but the 'branching' pattern in picture 2 threw me off a lot, going to bryozoans and all sorts, bouncing around til' I decided, maybe, not a fossil? But then again, it displays the glow from calcite: And, secondly: The gap between the layers suggests to me that something dissolved - a shell? Any input appreciated! Isaac.thumb.jpeg.2e28c8a974d64df8f003b5bd203d6078.jpeg)
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Hi everyone! I recently acquired this very large Mosasaur tooth and was hoping to get some help with two questions. The first is help with a species ID since it seems a lot of these are being IDed as this new species (thalassotitan) that was only discovered like a year ago I think? The second is what is going on in that root? There seems to be another Mosasaur tooth AND a Cretolamna shark tooth imbedded within the root. There's still some matrix around the fossils within the root which seems to have a very large cavity that shouldn't be there, so my hypothesis is that the root was broken and while lying on the sea floor matrix and other teeth gathered in the cavity. Either that or someone threw one heck of a party there 70 million years ago and things just got nuts. As usual though with something this weird I'm hoping for a second opinion. Tooth is from the Oled Abdoun Basin Moroccan phosphates. The entire specimen measures about 14.5 cm tall. The crown is 5.142 cm tall and 3.465 cm by 2.788 cm at its base. distal carinae seems to be lightly serrated. So what do you all think? Any insight is appreciated as always!
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- cretaceous
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Evidence of a 'Chaotic Solar System' from Cretaceous of Colorado
Oxytropidoceras posted a topic in Fossil News
From rocks in Colorado, evidence of a 'chaotic solar system' University of Wisconsin-Madison, February 22, 2017 http://news.wisc.edu/from-rocks-in-colorado-evidence-of-a-chaotic-solar-system/ https://www.sciencedaily.com/releases/2017/02/170222131512.htm http://www.astrobio.net/also-in-news/rocks-colorado-evidence-chaotic-solar-system/ The paper is: Ma, C., S. R. Meyers, and B. B. Sageman. Theory of chaotic orbital variations confirmed by Cretaceous geological evidence. Nature, 2017; 542 (7642): 468-470 DOI: 10.1038/nature21402 http://www.nature.com/nature/journal/v542/n7642/full/nature21402.html Related paper: Sageman, B. B., J. Rich, M. A. Arthur, G. E. Birchfield, and W. E. Dean, 1997, Evidence for Milankovitch Periodicities in Cenomanian-Turonian Lithologic and Geochemical Cycles, Western Interior U.S.A. Journal of Sedimentary Research, Section B: Stratigraphy and Global Studies Vol. 67 (1997) No. 2. (March), Pages 286-302 http://www.earth.northwestern.edu/research/sageman/PDF/97.Sageman.etal.pdf Yours, Paul H. -
New Jersey Nodosaur Donation
njcreekhunter posted a topic in Partners in Paleontology - Member Contributions to Science
Hey everyone. Last summer I found an interesting piece of late Cretaceous fossil bone with a unique texture in New Jersey. It was later identified as a Nodosaur osteoderm by Ralph Johnson. Dinosaur material in general is rare in New Jersey and this specimen to my knowledge is the second Nodosaur osteoderm found in the state of New Jersey. Recently, I had the pleasure of donating this specimen to the New Jersey State Museum. I am honored to be able to contribute this specimen to science for future generations to study. Here are photos of the specimen.
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- cretaceous
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The Chondricthyans (including the sharks and rays) have been around and keeping the ocean's ecosystems healthy for about 420 Million Years. Today, in celebration of this, I've decided to do a little fun post and list the eight times in Earth's history truly massive chondricthyans have emerged. Hope you all enjoy!!! The First is the Devonian, where there is at least one confirmed fossil (CMNH 5238) of a large currently unnamed Ctenacanthiform shark that reached lengths of 4.2-5 meters (13-16 feet) in length. https://www.mdpi.com/1424-2818/15/3/318 The Second is the Mississippian stage of the Carboniferous (358.9-323.2 Million Years ago), a golden age for chondricthyans. The Early Carboniferous saw the emergence of Giant Ctenacanthiform sharks like Saivodus striatus, which grew up to 10-11 meters (32-36 feet) in length. https://www.uky.edu/KGS/fossils/fossil-of-the-month_2022-07_Saivodus.php https://www.uky.edu/KGS/fossils/fossil-of-the-month_2022-07_how-big.php https://www.nps.gov/articles/000/fossils-of-the-2023-national-fossil-day-artwork.htm The Third is the Pennsylvanian stage of the Carboniferous (323.2-298.9 Million Years ago). Like the Mississippian, the Pennsylvanian was also a golden stage for Chondricthyans where large Ctenacanthiforms continued to thrive and large Eugeneodontida edestoids like Edestus (which could grow up to 6.7 meters (22 feet) in length) emerged. Large Ctenacanthiforms from this time include the unnamed Graham Formation Gilkmanius sp., which grew up to 7 meters (22 feet) in length. https://bioone.org/journals/journal-of-vertebrate-paleontology/volume-37/issue-3/02724634.2017.1325369/A-Pennsylvanian-Supershark-from-Texas/10.1080/02724634.2017.1325369.short The Fourth is the Permian (298-252 Million years ago). There were some large sharks, like the Ctenacanthiform Kaibabvenator (which grew up to 4.8-5.48 meters (16-18 feet) in length). But Eugeneodontida by this point contained the largest Chondricthyans alive at this time including Helicoprion (which grew up to 7.6 meters (25 feet) in length) and Parahelicoprion (which could grow up to 12 meters (36 feet) in length). https://www.academia.edu/29941296/Chondrichthyan_and_actinopterygian_remains_from_theLower_Permian_Copacabana_Formation_of_Bolivia https://doi.org/10.1002%2Far.24046 The Fifth is the Early Cretaceous (145-100 Million Years ago). Though the time's aquatic ecosystems was dominated by large marine reptiles, large sharks managed to emerge and fill ecological niches from time to time. This includes the Early Cretaceous Shark Leptostyrax, which grew up to 6.3 meters (20 feet) in length. https://www.researchgate.net/publication/277782424_A_Gigantic_Shark_from_the_Lower_Cretaceous_Duck_Creek_Formation_of_Texas The Sixth is the Late Cretaceous (100-66 Million years ago). Aquatic ecosystems still were dominated by marine reptiles, but large sharks were indeed present. This includes Cretodus crassidens (which grew up to 9-11 meters (29-36 meters) in length) and Ptychodus (which grew up to 10 meters (32 feet) in length). https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0231544 https://www.cambridge.org/core/journals/journal-of-paleontology/article/morphology-and-paleobiology-of-the-late-cretaceous-largesized-shark-cretodus-crassidens-dixon-1850-neoselachii-lamniformes/A670012A44DDC68FC098BB8C73368408 The seventh is the Miocene-Early Pilocene (23-3.6 Million Years ago). This period saw the rise and reign of some of the largest sharks known currently in the fossil record, including Carcharocles (Otodus) megalodon (which grew up to 17 meters (55 feet) in length). https://www.uv.es/everlab/PUBLICACIONES/2017/2017 Martinez-Perez et al HB miocene sharks.pdf https://www.science.org/doi/10.1126/sciadv.abl6529 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9385135/ The eighth is the Early Pliocene-Late Pleistocene (3.6-0.012 Million Years ago). This period saw the last remnants of the large 20 foot + in size carnivorous sharks from the Miocene-Pilocene mega shark era not including the non-Great White shark (Carcharodon carcharias) and not including the large plankton eating sharks make their final stand. These include Hemipristis serra (which grew up to 6 meters (20 feet) in length) and Parotodus benedeni (which grew up to 7.6 meters (24 feet) in length). https://www.app.pan.pl/archive/published/app63/app004542018.pdf https://www.researchgate.net/publication/364591134_A_previously_overlooked_highly_diverse_early_Pleistocene_elasmobranch_assemblage_from_southern_Taiwan https://www.cambridge.org/core/journals/paleobiology/article/chondrichthyan-fossil-record-of-the-florida-platform-eocenepleistocene/2835CCEC27DC8EE0B24A5B62B1416618 I hope this is helpful?-
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Hi all - I found these two pieces in Central Texas today. Anyone have any ideas? The first one looks like some kind of bone, the second looks like some kind of oolitic sediment or possibly a fossilized scute (according to google image search). I could also be way off on these. Any help is appreciated. Thanks!
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- cretaceous
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Echinoid Hemiaster bexari Corsicana Formation
JamieLynn posted a gallery image in Member Collections
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From the album: Texas Cretaceous Fossils: Echinoids
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Echinoid Diplodetus (Plesiaster) americanus Corsicana Formation
JamieLynn posted a gallery image in Member Collections
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From the album: Texas Cretaceous Fossils: Echinoids
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Echinoid Macraster texanus Duck Creek Formation
JamieLynn posted a gallery image in Member Collections
From the album: Texas Cretaceous Fossils: Echinoids
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- cretaceous
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Echinoid Pedinopsis engerrandi Comanche Peak Formation
JamieLynn posted a gallery image in Member Collections
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From the album: Texas Cretaceous Fossils: Echinoids
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My Jurassic Park: Pachycephalosaurid Domes & Teeth from Hell Creek Fm
Troodon posted a topic in Member Collections
Genera include Pachycephalosaurus, Stegoceras, Stygimoloch, and Dracorex in MT, SD and WY and all are found in the Hell Creek and Lance Formations although my specimens are just from the HC. I've identified these domes based on my, best guess, using accepted convention, however, in 2007 Horner presented a theory which proposed that Dracorex hogwartsia and Stygimoloch spinifer are growth stages of Pachycephalosaurus wyomingensis and represent an ontogenetic series of P. wyomingensis with Dracorex being the youngest. Pachycephalosaurid indet.: I think the shape is that of a P. wyomingensis but not certain, why I labeled it indet. Braincase cavities visible in ventral view Views: Dorsal, Left Lateral, Ventral Stegoceras sp.: Braincase cavities very evident in ventral view. Views: Dorsal, Left Lateral, Ventral Pachycephalosaurus wyomingensis: Interesting partial dome. One gets a great view on how thick these domes were, this one is a whopping 4 inches. A closeup of the structure of the layer beneath the outer surface is quite interesting. Views: Lateral, Dorsal, Ventral, Closeup
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- cretaceous
- hell creek formation
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Crab Dakoticancer australis Corsicana Formation
JamieLynn posted a gallery image in Member Collections
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From the album: Texas Cretaceous Fossils: Crustaceans
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Spathites puercoensis was originally described as Buchiceras swallovi in: The Geology of the Albuquerque Sheet (Herrick and Johnson, 1900) Later, the species Spathites puercoensis was formally illustrated in: The Late Cretaceous ammonite Spathites Kummel & Decker in New Mexico and Trans-Pecos Texas (W.A. Cobban, 1988)
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- carlile shale
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Gastropod Anomalofusus substriatus Corsicana Formation
JamieLynn posted a gallery image in Member Collections
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From the album: Texas Cretaceous Fossils : Gastropods
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Gastropod Cerithium bosquense Walnut Formation
JamieLynn posted a gallery image in Member Collections
From the album: Texas Cretaceous Fossils : Gastropods
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Gastropod Turitella vertebroides Corsicana Formation
JamieLynn posted a gallery image in Member Collections
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From the album: Texas Cretaceous Fossils : Gastropods
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From the album: Texas Cretaceous Fossils : Gastropods
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Gastropod Turritella irrorata Georgetown Formation
JamieLynn posted a gallery image in Member Collections
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From the album: Texas Cretaceous Fossils : Gastropods
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From the album: Texas Cretaceous Fossils: Coral, Forams, Bryozoans and More
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From the album: Texas Cretaceous Fossils: Oysters
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