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Showing results for tags 'late cretaceous'.
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From the album: New Jersey Late Cretaceous
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Hello, I live in Austin, TX, and my house sits on top of the Glen Rose formation from the late Cretaceous. I usually find bi-valve oyster shells and the like in my yard, but came across something bigger today that seems like it's from a non-invertebrate. Can anyone provide information on what this fossil might be? Thanks. Joe
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hey everyone - hope you're all well Thought this was worth sharing - a description of a well-preserved enantiornithean bird specimen from the Late Cretaceous Kaiparowits Formation of Utah. It represents a new genus and species, Mirarce eatoni. The specimen was originally collected in 1992, but it was only recently described (and published yesterday!). Atterholt et al. (2018). The most complete enantiornithine from North America and a phylogenetic analysis of the Avisauridae. PeerJ, DOI 10.7717/peerj.5910 Abstract: The most complete known North American enantiornithine was collected in 1992 but never formally described. The so-called “Kaiparowits avisaurid” remains one of the most exceptional Late Cretaceous enantiornithine fossils. We recognize this specimen as a new taxon, Mirarce eatoni (gen. et sp. nov.), and provide a complete anatomical description. We maintain that the specimen is referable to the Avisauridae, a clade previously only known in North America from isolated tarsometatarsi. Information from this specimen helps to clarify evolutionary trends within the Enantiornithes. Its large body size supports previously observed trends toward larger body mass in the Late Cretaceous. However, trends toward increased fusion of compound elements across the clade as a whole are weak compared to the Ornithuromorpha. The new specimen reveals for the first time the presence of remige papillae in the enantiornithines, indicating this feature was evolved in parallel to dromaeosaurids and derived ornithuromorphs. Although morphology of the pygostyle and (to a lesser degree) the coracoid and manus appear to remain fairly static during the 65 million years plus of enantiornithine evolution, by the end of the Mesozoic at least some enantiornithine birds had evolved several features convergent with the Neornithes including a deeply keeled sternum, a narrow furcula with a short hypocleidium, and ulnar quill knobs—all features that indicate refinement of theflight apparatus and increased aerial abilities. We conduct the first cladistic analysis to include all purported avisuarid enantiornithines, recovering an Avisauridae consisting of a dichotomy between North and South American taxa. Based on morphological observations and supported by cladistic analysis, we demonstrate Avisaurus to be paraphyletic and erect a new genus for “A. gloriae,” Gettyia gen. nov. here's the paper: Atterholt et al. Hope you like it! -Christian
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Originally the specimen was collected as a concretion from upper Pierre Shale Formation near the lowest level of the Fox Hills Formation. The collection location is Cedar Creek about seven miles south of Glendive, Montana. The Date collected was Oct. 12, 2018. Later, I removed most of the concretion/matrix with diamond blade and bits. Two of the hoploscaphites spedeni were badly crushed and fractured during fossilization and are missing half of shells. During prep, I miscalculated the depth of cutting blade, slightly damaging the middle scaphites.
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Preparation of 'Mukawaryu', a nearly complete ornithopod skeleton, has been completed! The specimen is originated from the marine Yezo Group of Hokkaido (Japanese island), a location/rock unit famed for numerous heteromorph (uncoiled) ammonites. http://www.geologypage.com/2018/09/japans-largest-complete-dinosaur-skeleton-comes-to-life.html Now research of this fascinating dinosaur specimen can finally begin! -Christian
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I believe I know the answers but like to confirm the ID's and raise a red flag if appropriate. Seller is offering the following from the Judith River Formation of Montana Saurnitholestes Tooth 1/4" Aublysodon Tooth 3/4" Daspletosaurus tooth 1.4" Daspletosaurus tooth 7/8"
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Sphenodiscus lenticularis ammonite and other shell fossils in a shale matrix
xraymike79 posted a topic in Member Collections
Sphenodiscus lenticularis ammonite From the late Cretaceous, Maastrichtian stage Fox Hills Formation, South Dakota
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The Aguja micro vertebrate assembladge is quite diverse. I've attached a few of my finds some identified some misidentified , some unknown . Lots still to identify and photograph so I will keep adding to this topic. Apologize for the quality of photos need to invest in a better digital scope to obtain crisper photos of these tiny specimens. Material is Campanian in age from Texas Dinosaurian Actinopterygii Additional Teeth Amiid Fish Tooth Below, Lepisosteid Tooth Top Chondrichthyes
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I see a tooth being sold as Aublysodon and the seller also states it could be another juvenile tyrannosaurid My understanding is that this is not a valid species correct. Tooth is around 1/2 "
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Was just in the Ramanessin Brook today looking for shark teeth and stumbled upon this interesting fossil. I have never seen anything like this. Could it be a possible vertebrae from a marine mammal or late Cretaceous marine species?
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Documented in this paper is baby hadrosaur that represents the first occurrence of an articulated nestling dinosaur skeleton from the latest Cretaceous (late Maastrichtian) of North America. It's from the Hell Creek of Montana, Garfield County. Edmontosaurus annectens Red... Scapula Purple.. Vert column Green..Pubis Blue.. Femur & Tibia Journal of Vertebrate Paleontology. ....Paywalled for non members.. A nestling-sized skeleton of Edmontosaurus(Ornithischia, Hadrosauridae) from the Hell Creek Formation of northeastern Montana, U.S.A., with an analysis of ontogenetic limb allometry Mateusz Wosik,Mark B. Goodwin &David C. Evans http://www.tandfonline.com/doi/abs/10.1080/02724634.2017.1398168?journalCode=ujvp20#.Wog2CXWObFg.twitter
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The Dino Project is a scientific, educational and cultural unit of the National University of Comahue and aims to rescue from the rock all the dinosaurs and other animal and plant remains that inhabited the Barreales Lake area 90 million years ago. This is the only Earth Ecosystem of the Upper Cretaceous of South America and it is considered a hole in Geological time to see the past. The field work involves the extraction, preparation, study and exhibition of the fossils found in the same site. On the other hand, it is an objective of the project to disseminate this activity at all levels of society and education in order to learn to value our heritage and the effort involved in carrying it forward. For more info their website http://www.proyectodino.com/ Location north coast of Lake Barreales, in the province of Neuquén Findings include Some Photos provided by Jorge Orlando Calvo Complete manus of Megaraptor namunhuaiquii Several Sauropods have been found including the Titanosaur Futalognkosaurus dukei Vertebrae Now this is a vertebra Another of the theropod dinosaurs represented by a pubis, ileum (bones of the hip), humerus, claw and a dorsal vertebra is Unenlagia paynemili . This carnivore is very important in the evolution of dinosaurs and birds since it represents a true link between both groups. The holotype of Macrogryphosaurus gondwanicus. One of The biggest ornithopod in South America. In addition, more than 300 teeth have been found with different types of "saws" from at least 5 different species of theropods
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Back in September I posted My Jurassic Park - Theropod Claws from the Kem Kem, the link is attached and now this topic is its continuation. There is more to the Kem Kem than just Theropod Claws (my passion) and I would like to share that with you. The Kem Kem beds consists of three formation: Ifezouane, Aoufous and Akrabou and most of the Dinosaur material comes from there but not all and I'll share a few examples of that. The Kem Kem beds are not a large area in Morocco and I've attached a map to give everyone a good understanding of that and where they are geographically. The best fossils come near the border with Algeria but most of these collecting areas are depleted and today diggers are going to more remote areas. The Kem Kem Region Lets begin with my favorite Spinosaurus aegypticacus (sp.) The teeth can be massive and here are a few examples
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Hey everyone, I would like your opinion on this interesting vertebra (from the NJ Late Cretaceous). I identified it a long time ago as a first cervical vertebra from either a ray or an angel shark. An expert looked at some pictures and thinks it is a batoid first cervical vertebra. Sorry about the picture quality, these are old photos. Thanks for any help!
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Paper just released that describes the dorsal vertebrae in detail of the titanosaur Dreadnoughtus schrani from Argentina that was described in 2014. If you ever wanted to know what the different areas of a dorsal vertebra were called this gives you more than you ever need. It also gives you relative position in the vertebral column. You will be tested on the pronunciation and spelling of these words Check the scale bar it's 50 cm (appox 20 inches) Complete dorsal vertebrae are very rare especially this well preserved. This discovery gives paleontologist an opportunity to use these specimens to compare against other taxons. It also gives them a better understanding of their position in the sketal structure. https://www.app.pan.pl/article/item/app003912017.html Osteology of the dorsal vertebrae of the giant titanosaurian sauropod dinosaur Dreadnoughtus schrani from the Late Cretaceous of Argentina Kristyn K. Voegele, Matthew C. Lamanna, and Kenneth J. Lacovara Acta Palaeontologica Polonica 62 (4), 2017: 667-681 doi:https://doi.org/10.4202/app.00391.2017 app62-Voegele_etal_SOM.pdfapp003912017.pdf Supplemental Images app003912017.pdf Dreadnoughtus 2014 paper https://www.nature.com/articles/srep06196
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Better pictures of possible dinosaurian teeth from flints of Lithuania
D.N.FossilmanLithuania posted a topic in Fossil ID
Dear Guys, I recently photographed these small reptile teeth with maximum contrast and got quite good pictures. They are already sent to dinosaur specialist but until I wait for an answer I would like to dicuss about these finds judging by better picture qualities. The first tooth from three sides (2.7 mm length):
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Dear Guys, I recently prepared one bigger tooth I have found in flint erratic, it is 1 cm length, crimson and little curved with blunt upper end unusual to shark. The edges are little serrated but I wouldn't expect dinosaur. However, I think it is also not from bony fish and the serrations look more reptile like. Plesiosaurs and elasmosaurs have quite rounded cross section in teeth, so maybe it is from Pachyvaranus, etc.? Any idea what is this? Best Regards Domas
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Good evening Guys, Today I splitted some flint erratics in gravel and except some fish remains founde this tooth. It is straight in sculpture, 5 mm length, serrated edges are not visible and its vertical groove texture is irregular what makes me think it does not represent fish. I would say it is baby mosasaur or very small mosasaur species, but I want to find out which taxon would be the most correct for this find. If you see features typical to known reptile or other vertebrate group, please let me know. Any help will be appreciated! Best Regards Domas
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I just bought a large, fairly well preserved vertebra from a rock shop in Tucson. It was found in the Aguja Formation in Texas, a formation that isn’t especially well researched. My diagnosis is that the vert is most likely theropod, and the only theropod that large that is in the area and comes to mind for me is the Acrocanthosaurus. This diagnosis is leaving me skeptical. Acro bones are pretty rare to my knowledge (there are only 5 articulated specimens discovered as of now), and I don’t see any documentation of them being found in Aguja, though as I said before it is not well researched. My only other theories are that this is from a Kritosaurus (which seems unlikely based on the size and shape), or that it is some other saurischian that isn’t documented in the formation yet. If I could at least get verification that it is theropod that would be very nice. This purchase will either have been a pretty good deal, or an absurdly amazing one. We’ll see, and thanks for helping! Bone is 6.75” long, 4.5” wide at widest point, and 4.75” tall at tallest point.
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Hello! I found a mysterious fossil bone while looking for shark teeth in NE Mississippi this past weekend. I believe it is from the Eutaw Formation which is Late Cretaceous. This bone appears to be complete, although maybe a bit creek-worn. It is as hard as a chert creek rock with visible minerals present in the pores. Size is 2.75" long, by 2" wide, and around 1.5" thick (including the arches on the other side). I have not studied vertebrates, and have no idea how to technically describe bones, but it looks like the largest surface is a ball (like a ball/socket) and there are two areas on either side that look like contact points. If you turn it over, it is almost heart-shaped with another ball-type surface at the bottom of the "heart shape" and two concave areas on the sides (lots of mineral "stripes" in this area). At the top of the heart shape, there is a dovetail-shaped notch. I am more than happy to take additional photos if requested! I've scoured Google and can't find much to go by, but I am guessing that it is probably some kind of marine reptile or less likely, a dino that had washed out to sea. I know it is a stretch to be able to identify one lonely little bone, but I would love to know anything I can about it, no matter how general. Thanks everyone!!!
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A very rare new discovery: The North Carolina Museum of Natural Sciences reported today that a clutch of oviraptorosaur eggs was found in the San Rafael Swell of Utah. It was a first for the North American continent since these ars typically found in Asia. NC Museum release with video http://naturalsciences.org/calendar/news/rare-dinosaur-eggs-discovered-by-n-c-museum-of-natural-sciences-paleontologist/ @HamptonsDoc @-Andy-
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Last Sunday I stopped at an outcrop of the Maastrictian (late Cretaceous) Prairie Bluff Chalk in western Alabama. About 3 meters below the top of the formation I encountered this tooth. It was definitely in situ, I had to chisel it out. It's 2.1 cm long, 1.6 cm wide at the base, and 0.7 cm thick at the base (so quite flat). Despite some cracking the tooth is not distorted, it is actually flattened not compressed during fossilization. One face is almost flat, and the other is curved. Both sides are serrated until very close to the tip; there are 5-6 serrations/mm. I have an idea of what this tooth is, or what I want it to be, but I have never collected one before so I'd like to get more experienced opinions. One thing that is confusing about this, the Prairie Bluff is a fully marine formation, deposited well offshore in moderately deep water. Associated fauna included a diverse array of marine bivalves, gastropods, echinoids, cephalopods (heteromorph ammonites including baculitids, Hoploscaphites, Discoscaphites, and Diplomoceras, as well as coiled nautiloids), and very scarce shark teeth, so it was definitely a fully marine environment. So, what do y'all think? Don
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Hi everyone, I am new to fossils and have got hold of a Tyrannosaurus Rex from someone I know. The tooth was found in Hell Creek Formation, Faith, South Dakota USA and is 2.5 inches in length and the teeth itself is really heavy (pics attached). Let me know if you need me to take clearer photos of serrations as it is quite hard as my camera's macro focus doesn't work very well. As you can see from the pics this teeth has some surface wear to the enamel and serrations... Serrations worn may have been from feed wear. Please can you help me identify if its from the Tyrannosaurus Rex as opposed to one of the members like the Nanotyrannosaurus or Carcharodontosaurus? Thank you! Jai
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From the album: MY FOSSIL Collection - Dpaul7
Mosasaur Jaw Oued Zem, Morocco TIME PERIOD: Late Cretaceous (73-95 Million Years Ago) First and most importantly, mosasaurs are not dinosaurs. Mosasaurs (from Latin Mosa meaning the 'Meuse river', and Greek sauros meaning 'lizard') are an extinct group of large marine reptiles. Their first fossil remains were discovered in a limestone quarry at Maastricht on the Meuse in 1764. Mosasaurs probably evolved from an extinct group of aquatic lizards known as aigialosaurs in the Early Cretaceous. During the last 20 million years of the Cretaceous period (Turonian-Maastrichtian ages), with the extinction of the ichthyosaurs and pliosaurs, mosasaurs became the dominant marine predators. They became extinct as a result of the K-Pg event at the end of the Cretaceous period, about 66 million years ago. Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: Squamata Family: †Mosasauridae -
A very brief article about the "Chicken from Hell" Anzu wyliei found in the Hell Creek Formation. Added some of my photos to get a better view of this cool Dinosaur. Carnegie Museum Article http://carnegiemuseumnaturalhistory.tumblr.com/post/165688152585/anzu-wyliei-perhaps-better-known-by-its-colorful/amp?__twitter_impression=true 5 feet high at the hips. Hand Claws reached 7 inches long
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