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Showing results for tags 'late cretaceous'.
Found 157 results
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Hello everyone, I saw this specimen for sale as a new species from the Vallecillo quarries. I haven’t seen something like this from this formation. Does anyone have any idea of what species might this be? The size of fossil is approximately 40 cms long. The size of the matrix is 63 cms * 43 cms. The pictures were not taken by me. Thanks everyone.
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Hello everyone, I hope life has been pacing along well for all of you. At the moment, I find myself at school and away from my idealistic home, that is, buried alongside the Cretaceous fossils swimming in the various soils of NJ. No worry though! I have been going through some micro gravel in Ohio and today will present you with my second batch of finds. I believe I've found some cool things so far. The most notable differences between this post and my previous (besides the fossils of course) is that I post fewer photos and more group shots. Enjoy. Meristodonoides sp. Rhombodus laevis + Other Rays Scapanorhynchus texanus (symphesial) Paralbula casei Hadrodus priscus Lonchidion babulskii Ischyrhiza mira Other Shark's Teeth Ptychotrygon sp. Osteichthyan Vertebrae Unidentified
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- late cretaceous
- njfossils
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Found this in a marine late cretaceous formation in Maryland. Two bones that were immediately associated with each other. I thought the flat bone was turtle when I saw it, but this other bone was just underneath it. Now I really dont know what I am looking at. help?
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Hey everyone, I am curious to see your largest complete sawfish rostral spines, Xiphactinus sp. teeth, and Enchodus sp. teeth. Here are mine:
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- new jersey
- late cretaceous
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Hello everyone, in addition to posting my other topic today, I am going to post this one. With the summer coming to a close, I am preparing to go back to college in Ohio and continue my study of Neuroscience and Mathematics. The rain in Ohio and ID'ing NJ fossils in the ID section often make me lament all of potential NJ hunts I am missing out on because I am at school. So, I thought it would be a good idea to collect micro matrix using a window screen and stock several buckets full of gravel to look through during the semester. Over the last two weeks or so I've had the opportunity to do some early looking and will share my finds in this post. Hopefully I will be able to make many more NJ Micro trip reports during the course of the semester. I am still figuring out the proper mixture of lighting and camera angles. Also, you may notice it in this post, but I am adjusted the properties Exposure, Shadows, and Sharpness to get the optimal view of the fossils. The black borders and resizing of the photos were automatically done by a Python script I wrote. Perhaps with more micro reports I can become better at ID'ing what I find (there are still many things that I have found where I am at a loss for what they are) and taking photos. Enjoy. Here is my setup currently Here is some gravel I've looked through FOSSILS Format: <suspected ID> Maybe Rhombodus laevis AMALGAM OF RAYS 1 (tooth) 2 (tooth) 3 (tooth) 4 (tooth) 5 (tooth) 6 (denticle) 7 (denticle: In middle) Lonchidion babulskii Ptychotrygon sp. 1 2 Ischyrhiza mira 1 2 3 4 5 6 Squatina hassei (potentially) Hadrodus priscus 1 2 3 Ischyodus bifurcatus SHARK TEETH MISCELLANEOUS BUT POSSIBLY DIAGNOSTIC 1 2 GENERAL FINDS 1 2
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- njfossils
- late cretaceous
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Dear Fellow Forum goers, I intend this to be just a quick trip report. My friend @The Jersey Devil and I decided to do some collecting on what turned out to be a very pleasant day. Both of us were quite tired for some reason and didn't really hunt as intensely as we could have. We both did okay. I found some decent things, but nothing to write home about. Maybe next time. There were many leaves and trees down due to the recent winds. Overall, the experiences we had today 08/06/2020 were pretty good. I hope you enjoy what I found. - Trevor More appealing finds Medium bone chunk General finds
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- new jersey
- late cretaceous
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From abstract: Some authors recognize three Caenagnathid genera, others suggest only two were present, and there is considerable disagreement about which specimens are referable to which genus. This study aims to resolve this issue by reviewing the known specimens and using osteohistology, to establish a testable taxonomic framework of Dinosaur Park https://journals.library.ualberta.ca/vamp/index.php/VAMP/article/view/29362
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- dinosaur park formation
- caenagnathids
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I was given this very small piece of ?mandibular bone. Any help would be appreciated in id. it is approximately 12-14 mm in length, 4 mm in height and maybe 2 mm on the dental surface from the hells creek formation in montana.
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From the album New Jersey Late Cretaceous
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From the album New Jersey Late Cretaceous
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From the album New Jersey Late Cretaceous
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From the album New Jersey Late Cretaceous
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From the album New Jersey Late Cretaceous
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From the album New Jersey Late Cretaceous
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Every few years we get rewarded with a new dinosaur described from the Lance/Hell Creek Formations. In this crazy year we finally have one. Finally an Alvarezsauridae has been described from the Hell Creek Formation: Trierarchuncus prairiensis. Sorry its paywalled cannot make comments https://www.sciencedirect.com/science/article/pii/S0195667120302469 Here is some info on this very different dinosaur, one of my favorites, including some of my material so you can see what the paper is describing. Far better than what you see in the paper
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- trierarchuncus prairiensis
- alvarezsauridae
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Dear Fellow Forum members, Lately I have been somewhat frustrated by my dearth of knowledge on the Late Cretaceous deposits and fauna of NJ. I collect the Late Cretaceous of NJ frequently and am seeking a more thorough comprehension of everything related to it. While reading research papers can go far, there is some information that is proving difficult to find or procure. Here I have listed some of the questions that I have come up with, hopefully some can be answered. At the very least, some pointers would be a great start (links to papers, personal experiences, photos specimens in your collection, etc..). Cheers till we meet in the stream again. 1. What is the current state of knowledge on Peyeria sp. in NJ? 2. How many species of sand tiger are currently found in the NJ Late Cretaceous? 3. What is the best referential repository of finds for Necrocarcinus sp.? (probably MAPs, but I forgot to check when I went there) 4. Are there any documented pieces of Necrocarcinus sp. besides claw fragments? 5. Has Enchodus ferox been documented anywhere else in NJ other than Site H_? 6. How diagnostic are most teeth of the Crocodilia order in common stream systems? 7. Is there any dispute over whether X. vetus is the sole supplier of Xiphactinus. sp teeth in NJ? 8. Is there a specimen of C. magnus jaw fragment from NJ or MD? 9. What is the likelihood that some specimens of Ischyodus bifurcatus are in fact some other chimaeriforme? 10. How many documented Globidens sp. teeth from NJ exist in scientific repositories? 11. What are the primary differences between A. phaseolus and A. latidens? 12. What is the commonality (personal experience) of fused Chondrichthyian vertebrae as float? 13. Is there any work illuminating how many potential Pachyrhizodus species there are in NJ? 14. Is there a repository of scientifically accurate (well, as much as is possible) NJ fossil art work? 15. Does anyone have any pictures of Xiphactinus sp. or Enchodus sp. pectoral fins from NJ? 16. Does Squalicorax "kaupi" = Squalicorax lindstromi, or is the latter more specific? (Didn't S. kaupi refer to potentially multiple species? Is S. lindstromi a paleobucket too or one of the species S. kaupi may have referred to?) @Carl @non-remanié @frankh8147 @The Jersey Devil @Jeffrey P @njfossilhunter @hokietech96 @brad hinkelman @Darwin Ahoy
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- late cretaceous
- paleontology
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Hi all! The Aguja Formation matrix that I ordered from PaleoTex arrived on June 12th, but I decided to wait until school ended before I began the process of searching it. Well, school ended yesterday so I have begun the process today! My 5 pounds of matrix are currently soaking in a solution of baking soda and water (because the matrix arrived "unwashed"), but while stirring up the squishy contents with my hand, I found the following 3 items that I'd like your input on. Item #1: Could this be a ceratopsian spitter tooth??? @Troodon More to follow...
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- texas
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Found on 06/06/2020 Post Oak Creek, surface hunting. -
A new paper is online that you may find interesting: Matías J. Motta; Federico L. Agnolín; Federico Brissón Egli; Fernando E. Novas (2020). New theropod dinosaur from the Upper Cretaceous of Patagonia sheds light on the paravian radiation in Gondwana. The Science of Nature 107 (3): Article number 24. doi:10.1007/s00114-020-01682-1. The recovery of Overoraptor as sister to Rahonavis in a clade sister to Avialae shows that not all non-pygostylian paravians were unenlagiids. If this phylogenetic placement holds water, then Rahonaviformes Livezey and Zusi, 2007 and Rahonavidae Livezey and Zusi, 2007 are available names for the Rahonavis+Overoraptor clade. B. C. Livezey and R. L. Zusi. 2007. Higher-order phylogeny of modern birds (Theropoda, Aves: Neornithes) based on comparative anatomy. II. Analysis and discussion. Zoological Journal of the Linnean Society 149(1):1-95
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- paraves
- late cretaceous
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Need help in identifying problematic fish bone
The Amateur Paleontologist posted a topic in Fossil ID
Hey everyone Hope you're all doing well! While looking through unprepped/untouched blocks of chalk from last year's fieldwork session in the Late Cretaceous of Møns Klint (Denmark), I found one block that showed a little trace of fish bone. I scraped a bit around it with some dental tools, and managed to reveal the whole fossil. And I'm having quite some trouble identifying it... Could anyone help me? I've included pics and details of the specimen below. Pics: Note especially the 'ridges' in the upper half of the fossil Full details: -Location: Møns Klint, Isle of Møn, Denmark -Stratigraphy: Occidentalis belemnite zone, Hvidskud Member, Møns Klint Formation, White Chalk Group. -Age: Upper part of Lower Maastrichtian, Late Cretaceous; ~70 million years old -Measurements: ~5mm largest width; ~4mm height -Possible interpretations so far: partial fin element, partial scale. Most recently, I considered it to be the partial scute of a Dercetidae fish (based on Wallaard et al. 2019 and Friedman 2012)... But I'm really unsure... Taken from Wallaard et al. 2019 Taken from Friedman 2012 I'd be really grateful for any help identifying my specimen- 1 reply
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- møns klint
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A new paper is available online if you're interested: Claudia Inés Serrano-Brañas; Belinda Espinosa-Chávez; S. Augusta Maccracken; Cirene Gutiérrez-Blando; Claudio de León-Dávila; José Flores Ventura (2020). Paraxenisaurus normalensis, a large deinocheirid ornithomimosaur from the Cerro del Pueblo Formation (Upper Cretaceous), Coahuila, Mexico. Journal of South American Earth Sciences. in press: Article 102610. doi:10.1016/j.jsames.2020.102610. Paraxenisaurus constitutes the first record of Deinocheiridae in North America, and it also represents the second ornithomimosaur to be described from Mexico ("Saltillomimus" is waiting to be published). The question now is whether a number of specimens found in the late Campanian-Maastrichtian of New Mexico assigned to Ornithomimidae could be similar to Deinocheirus and Paraxenisaurus.
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- paraxenisaurus
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Excellent paper that examines the geology and paleontology of what they call the Kem Kem Group that includes the lower Gara Sbaa and upper Douira formations . I will add that the authors view of the dinosaur assemblage in this fauna does not agree with recent publications from other paleontologists. Great images of croc teeth, dinosaur teeth and claws. It even discusses "that some geographic names are simple errors that gain traction in secondary citations. In a prominent compilation of dinosaur localities, for example, the term “Tegana Formation” was cited for the “Kem Kem beds” (Weishampel et al. 1990). This may have arisen as a misspelling of the “Tegama Group”, a name for Cretaceous age beds in Niger. Although the error was noted (Sereno et al. 1996), it has reappeared in subsequent publications (e.g., Bailey 1997, Kellner and Mader 1997, Taverne and Masey 1999, Weishampel et al. 2004)" Article ...PDF in that article is +100mb https://zookeys.pensoft.net/article/47517/
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- late cretaceous
- douira formation
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A new pterosaur-related paper is available online: David M. Martill; Roy Smith; David M. Unwin; Alexander Kao; James McPhee; Nizar Ibrahim (2020). A new tapejarid (Pterosauria, Azhdarchoidea) from the mid-Cretaceous Kem Kem beds of Takmout, southern Morocco. Cretaceous Research. in press: Article 104424. doi:10.1016/j.cretres.2020.104424. Afrotapejara represents the second non-Alanqa azhdarchoid pterosaur from the Kem Kem beds of Morocco, and niche partitioning could explain the presence of more than one azhdarchoid taxon from the Kem Kem Beds.
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- afrotapejara
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Late Cretaceous marine sites in China
The Amateur Paleontologist posted a topic in Questions & Answers
Hey Would anyone know of Late Cretaceous fossil sites in China that are similar to 'typical' Late Cretaceous marine sites in Europe/North America? Like places where one can find ammonites, sea urchins, shark teeth and mosasaur fossils... Thanks for any help! Christian -
Hello, I have recently found these pycnodontes at a maastrichtian site in SE North Carolina, USA . It is Pee Dee formation. Would anyone know the speices ? The upper valve is rather flat as opposed to concave and has radiant grooves which I have not seen in my research. The lower valves vary from being almost flat on some to a deep dish concave on others. I have attached two different ones. The first picture of each is the upper valve showing the radiant grroves. Second picture is lower valve. Third picture is the hinge area. Fourth picture is an attempt to show the overall contour. Thanks for any help.
