Jump to content

Search the Community

Showing results for tags 'late jurassic'.



More search options

  • Search By Tags

    Type tags separated by commas.
    Tags should be keywords or key phrases. e.g. carcharodon, pliocene, cypresshead formation, florida.
  • Search By Author

Content Type


Forums

  • Fossil Discussion
    • General Fossil Discussion
    • Fossil Hunting Trips
    • Fossil ID
    • Is It Real? How to Recognize Fossil Fabrications
    • Partners in Paleontology - Member Contributions to Science
    • Questions & Answers
    • Fossil of the Month
    • Member Collections
    • A Trip to the Museum
    • Paleo Re-creations
    • Collecting Gear
    • Fossil Preparation
    • Member Fossil Trades Bulletin Board
    • Member-to-Member Fossil Sales
    • Fossil News
  • Gallery
  • Fossil Sites
    • Africa
    • Asia
    • Australia - New Zealand
    • Canada
    • Europe
    • Middle East
    • South America
    • United States
  • Fossil Media
    • Members Websites
    • Fossils On The Web
    • Fossil Photography
    • Fossil Literature
    • Documents

Blogs

  • Anson's Blog
  • Mudding Around
  • Nicholas' Blog
  • dinosaur50's Blog
  • Traviscounty's Blog
  • Seldom's Blog
  • tracer's tidbits
  • Sacredsin's Blog
  • fossilfacetheprospector's Blog
  • jax world
  • echinoman's Blog
  • Ammonoidea
  • Traviscounty's Blog
  • brsr0131's Blog
  • brsr0131's Blog
  • Adventures with a Paddle
  • Caveat emptor
  • -------
  • Fig Rocks' Blog
  • placoderms
  • mosasaurs
  • ozzyrules244's Blog
  • Sir Knightia's Blog
  • Terry Dactyll's Blog
  • shakinchevy2008's Blog
  • MaHa's Blog
  • Stratio's Blog
  • ROOKMANDON's Blog
  • Phoenixflood's Blog
  • Brett Breakin' Rocks' Blog
  • Seattleguy's Blog
  • jkfoam's Blog
  • Erwan's Blog
  • Erwan's Blog
  • Lindsey's Blog
  • marksfossils' Blog
  • ibanda89's Blog
  • Liberty's Blog
  • Liberty's Blog
  • Back of Beyond
  • St. Johns River Shark Teeth/Florida
  • Ameenah's Blog
  • gordon's Blog
  • West4me's Blog
  • West4me's Blog
  • Pennsylvania Perspectives
  • michigantim's Blog
  • michigantim's Blog
  • lauraharp's Blog
  • lauraharp's Blog
  • micropterus101's Blog
  • micropterus101's Blog
  • GPeach129's Blog
  • nicciann's Blog
  • Olenellus' Blog
  • nicciann's Blog
  • maybe a nest fossil?
  • Deep-Thinker's Blog
  • Deep-Thinker's Blog
  • bear-dog's Blog
  • javidal's Blog
  • Digging America
  • John Sun's Blog
  • John Sun's Blog
  • Ravsiden's Blog
  • Jurassic park
  • The Hunt for Fossils
  • The Fury's Grand Blog
  • julie's ??
  • Hunt'n 'odonts!
  • falcondob's Blog
  • Monkeyfuss' Blog
  • cyndy's Blog
  • pattyf's Blog
  • pattyf's Blog
  • chrisf's Blog
  • chrisf's Blog
  • nola's Blog
  • mercyrcfans88's Blog
  • Emily's PRI Adventure
  • trilobite guy's Blog
  • xenacanthus' Blog
  • barnes' Blog
  • myfossiltrips.blogspot.com
  • HeritageFossils' Blog
  • Fossilefinder's Blog
  • Fossilefinder's Blog
  • Emily's MotE Adventure
  • farfarawy's Blog
  • Microfossil Mania!
  • A Novice Geologist
  • Southern Comfort
  • Eli's Blog
  • andreas' Blog
  • Recent Collecting Trips
  • retired blog
  • Stocksdale's Blog
  • andreas' Blog test
  • fossilman7's Blog
  • Piranha Blog
  • xonenine's blog
  • xonenine's Blog
  • Fossil collecting and SAFETY
  • Detrius
  • pangeaman's Blog
  • pangeaman's Blog
  • pangeaman's Blog
  • Jocky's Blog
  • Jocky's Blog
  • Kehbe's Kwips
  • RomanK's Blog
  • Prehistoric Planet Trilogy
  • mikeymig's Blog
  • Western NY Explorer's Blog
  • Regg Cato's Blog
  • VisionXray23's Blog
  • Carcharodontosaurus' Blog
  • What is the largest dragonfly fossil? What are the top contenders?
  • Hihimanu Hale
  • Test Blog
  • jsnrice's blog
  • Lise MacFadden's Poetry Blog
  • BluffCountryFossils Adventure Blog
  • meadow's Blog
  • Makeing The Unlikley Happen
  • KansasFossilHunter's Blog
  • DarrenElliot's Blog
  • jesus' Blog
  • A Mesozoic Mosaic
  • Dinosaur comic
  • Zookeeperfossils
  • Cameronballislife31's Blog
  • My Blog
  • TomKoss' Blog
  • A guide to calcanea and astragali
  • Group Blog Test
  • Paleo Rantings of a Blockhead
  • Dead Dino is Art
  • The Amber Blog
  • TyrannosaurusRex's Facts
  • PaleoWilliam's Blog
  • The Paleo-Tourist
  • The Community Post
  • Lyndon D Agate Johnson's Blog
  • BRobinson7's Blog
  • Eastern NC Trip Reports
  • Toofuntahh's Blog
  • Pterodactyl's Blog
  • A Beginner's Foray into Fossiling
  • Micropaleontology blog
  • Pondering on Dinosaurs
  • Fossil Preparation Blog
  • On Dinosaurs and Media
  • cheney416's fossil story
  • jpc
  • Red-Headed Red-Neck Rock-Hound w/ My Trusty HellHound Cerberus
  • Red Headed
  • Paleo-Profiles
  • Walt's Blog
  • Between A Rock And A Hard Place
  • Rudist digging at "Point 25", St. Bartholomä, Styria, Austria (Campanian, Gosau-group)
  • Prognathodon saturator 101

Calendars

  • Calendar

Categories

  • Annelids
  • Arthropods
    • Crustaceans
    • Insects
    • Trilobites
    • Other Arthropods
  • Brachiopods
  • Cnidarians (Corals, Jellyfish, Conulariids )
    • Corals
    • Jellyfish, Conulariids, etc.
  • Echinoderms
    • Crinoids & Blastoids
    • Echinoids
    • Other Echinoderms
    • Starfish and Brittlestars
  • Forams
  • Graptolites
  • Molluscs
    • Bivalves
    • Cephalopods (Ammonites, Belemnites, Nautiloids)
    • Gastropods
    • Other Molluscs
  • Sponges
  • Bryozoans
  • Other Invertebrates
  • Ichnofossils
  • Plants
  • Chordata
    • Amphibians & Reptiles
    • Birds
    • Dinosaurs
    • Fishes
    • Mammals
    • Sharks & Rays
    • Other Chordates
  • *Pseudofossils ( Inorganic objects , markings, or impressions that resemble fossils.)

Found 15 results

  1. Pliosaurus from Patagonia

    Hi, Does anyone have copies of the following papers regarding Pliosaurus: Gasparini, Z., and O'Gorman, J., 2014. A new species of Pliosaurus (Sauropterygia, Plesiosauria) from the upper Jurassic of northwestern Patagonia, Argentina. Ameghiniana; 51 (4): 269-283 O’Gorman, J., Gasparini, Z., & Spalletti, L. (2018). A new Pliosaurus species (Sauropterygia, Plesiosauria) from the Upper Jurassic of Patagonia: New insights on the Tithonian morphological disparity of mandibular symphyseal morphology. Journal of Paleontology, 1-14. doi:10.1017/jpa.2017.82 The description of Pliosaurus patagonicus and P. almanzaensis from Argentina shows that Pliosaurus must have been widespread in all seas and oceans.
  2. A new sauropod-related paper is now available online: Philip D Mannion, Paul Upchurch, Daniela Schwarz, Oliver Wings; Taxonomic affinities of the putative titanosaurs from the Late Jurassic Tendaguru Formation of Tanzania: phylogenetic and biogeographic implications for eusauropod dinosaur evolution, Zoological Journal of the Linnean Society, , zly068, https://doi.org/10.1093/zoolinnean/zly068 Giraffatitan, Tornieria, and Dicraeosaurus are the best-known sauropods from the Tendaguru Formation, but the paper by Mannion et al. (2019) provides new insights into non-diplodocoid, non-brachiosaur sauropod diversity in Tendaguru Hill by assigning the long-enigmatic sauropod Tendaguria to Turiasauria, and formally recognizing a set of tail vertebrae previously assigned to Janenschia as the first mamenchisaurid from Africa, bearing the new binomial Wamweracaudia keranjei. Given the placement of Janenschia outside Neosauropoda, and the turiasaur and mamenchisaurid classifications of Tendaguria and Wamweracaudia respectively, it is quite apparent that more than one clade of non-neosauropod sauropods existed in East Africa during the Late Jurassic.
  3. New choristodere from China

    A new paper you may find interesting: Ryoko Matsumoto, Liping , Yuan Wang & Susan E. Evans (2019). The first record of a nearly complete choristodere (Reptilia: Diapsida) from the Upper Jurassic of Hebei Province, People's Republic of China. Journal of Systematic Palaeontology (advance online publication) doi:Â https://doi.org/10.1080/14772019.2018.1494220 https://www.tandfonline.com/doi/full/10.1080/14772019.2018.1494220 Coeruleodraco is significant because it is the most complete Jurassic choristodere, considering that the exact relationships of Choristodera to other diapsids have remained contentious to this day given the dearth of early choristoderes. I know that the choristodere placement of Pachystropheus by Storrs and Gower (1993) has been questioned in recent papers due to the lack of skull remains, which preserve some diagnostic choristodere characters, and Lazarussuchus was considered the most primitive choristodere, a late-surviving basal one, until new material by Matsumoto et al. (2013) showed it to be more advanced than Cteniogenys.
  4. Fish tail?

    Hi, I went to the Tamazunchale area for Christmas break, and I bought this fossil from a local collector. He told me it was from some sort of aquatic animal. The sediments from the area are from the Pimienta, Santiago, and Taman formations. They represent Late Jurassic marine environments. Could this be a caudal fish fin (fish tail), or something else. I though it resembled part of a feather, but since they are marine sediments I doubt it.
  5. I periodically get asked about smaller theropod teeth so this is what I know. If you have additional tooth related information please pass it on. Tanycolagreus topwilsoni The holotype included a fragmented skull with one premaxillary and two lateral teeth. Unfortunately the teeth were crushed with no visible serrations so its unknown how to describe them. Holotype skull Reconstruction Skull of Marshosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw If you are interested in finding out more about Holotype skeleton this book is the best around. Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Koparion douglassi Oldest known Troodontid and only known from a single maxillary tooth. Picture says it all. A tooth taxon! Scale: A 1 mm, B-F 100 micrometers Chure, D. J. (1994). "Koparion douglassi, a new dinosaur from the Morrison Formation (Upper Jurassic) of Dinosaur National Monument; the oldest troodontid (Theropoda: Maniraptora)." Brigham Young University Geology Studies, 40: 11-15 Coelurus fragilis Known from a fairly complete skeleton however there is a question if the dentary, below, belongs to the skeleton. No teeth were recovered and cannot find any additional information on teeth. Ken Carpenter recently responded to my inquiry about these teeth. He stated that we have no teeth from this dinosaur. Teeth have been called Coelurus because they are small but there is no proof of association Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Ornitholestes hermanni Skull with both mandibles are part of the holotype. Osborn et. al (1917) paper just comments that the teeth are small and feeble. Carpenters book mentions that the skull is presently being studied by Mark Norell Carpenter, K., Miles, C., and Cloward, K. (2005). "New small theropod from the Upper Jurassic Morrison Formation of Wyoming." in Carpenter, K. 2005. The Carnivorous Dinosaurs, Indiana University Press: 23-48 Reconstructed Skull AMNH Osborn, Henry Fairfield (1917). "Skeletal adaptations of Ornitholestes, Struthiomimus, Tyrannosaurus". Bulletin of the American Museum of Natural History. 35 (43): 733–771. hdl:2246/1334. Allosaurus Needs to be developed, in the queue Torvosaurus Ceratosaurus Marshosaurus
  6. Torvosaurus tanneri is one of the apex theropods found in the Morrison Formation and has the largest dentition. Teeth of this and other theropods are commonly sold through online Dealers, Auction Houses and at Fossil shows. Just because a site/dealer sells Jurassic material does not guarantee accuracy. Variation of the teeth in the jaw also adds to the complexity. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. I have not been able to find any publication that describes the teeth of this species so it's beyond me how Sellers identify them other that they are big and look like Rex . The best I can do is to look at reference publications which include similar teeth from Portugal which describes Torvosaurus cf. gurneyi. Should be pretty close to Torvosaurus tanneri of the Morrison. Sellers need to provide you the following information: 1)Photo of tooth both sides and one of the mesial edge 2)Serration density of both edges, 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4)Locality: State and County Mesial teeth CHR : appox 2.75 Crown height ratio CH÷CBL CBR : appox .65 Crown base ratio CBW÷CBL Mesial Density: 7 to 8 per 5 mm, Distal Density: 7 to 8 per 5 mm all at midline. DSDI = 1 ( DSDI : Denticle size density index = Mesial Density ÷ Distal Density) Mesial and distal denticles decrease in size towards the base of the crown and similarly towards the crown apex. Mesial serrations occupy 55 to 65% of the crown height Distal serrations extend to below the cervex Cross-section base : sub-circular Lateral teeth CHR : 1.4 (short crowns), 2.8 (elongated crowns) Crown height ratio CH÷CBL CBR : .35 to .65 Crown base ratio CBW÷CBL Mesial Density: 6 to 9.5 per 5 mm, Distal Density: 6 to 9.5 per 5 mm all at midline. DSDI = 1 ( DSDI : Denticle size density index = Mesial Density ÷ Distal Density) Mesial serrations occupy 40 to 80% of the crown height Distal serrations extend to below the cervex Wide transverse undulations covering most of the tooth are common Isolated tooth of Torvosaurus cf. gurneyi in lingual (C1), labial (C2), mesial (C3), and distal (C4) views, with details of mesial (C5) and distal (C6) denticles, and enamel texture (C7) in lateral views. Reconstruction Skull of Torvosaurus from Utah Museum of Natural History. So you can see variation of the teeth in the jaw Reference: Hendrickx, C., Mateus, O., and Araújo, R. 2015. The dentition of megalosaurid theropods. Acta Palaeontologica Polonica 60 (3): 627–642.
  7. Gravesia gigas ( Zieten 1830)

    From the album Late Jurassic Ammonites from Southern Germany

    16cm. Late Jurassic, Tithonian, hybonotum zone. From a quarry in Emmingen-Liptingen.
  8. Archaeopteryx Could Fly

    I assumed that it was already confirmed that Archaeopteryx could fly but apparently this debate is just now coming to a close. It took awhile. Article 1: https://news.nationalgeographic.com/2018/03/archaeopteryx-flight-dinosaurs-birds-paleontology-science/ Article 2: https://gizmodo.com/new-evidence-suggests-archaeopteryx-could-fly-we-just-d-1823727562 The open access paper: https://www.nature.com/articles/s41467-018-03296-8
  9. A new article from Geology of the Intermountain West: A preliminary report of the fossil mammals from a new microvertebrate locality in the Upper Jurassic Morrison Formation, Grand County, Utah Article https://www.utahgeology.org/openjournal/index.php/GIW/article/view/25 PDF https://www.utahgeology.org/openjournal/index.php/GIW/article/view/25/47
  10. These camarasaurus metacarpals were discovered within a 20' area of the digsite. A number of other camarasaurus bones were found in the same area. They all came from a smaller, sub-adult camarasaurus. I'm trying to figure out if they all come from the same foot. (left, front foot) I have only two, or three worn out toe bones, and the big claw was missing. High energy water ripped this dinosaur apart. Parts of a diplodocus were scattered around the same area.
  11. Mystery Morrison Fm Fossil

    Boy this one has me stumped and I haven't got a clue what it is. From the late Jurassic of the Morrison Formation. I cleaned out the base and its a concave cavity. Any help pointing me in the right direction would be appreciated. Thanks 1 cm tall.
  12. Oldest Croc Eggs Discovered in Portugal

    "The oldest crocodilian eggs known to science have been discovered in the cliffs of western Portugal." Article HERE. Research paper HERE. Enjoy.
  13. Marshosaurus bicentesimus is a midsize theropod in the Morrison Formation in the Megalosauridae family. Over the past few years, teeth are becoming available in the open market simply because dealers/diggers are now more aware of this species and like to sell them. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. I have not been able to find any publication that describes the teeth of this species so it's beyond me how Sellers identify them. The best I can do is to look at other reference publications some which include similar teeth from Portugal and Germany which describe morph types and then assign them to the best taxon. So until we have a better definition this is a start to get us in the right direction Sellers need to provide you the following information: 1)Photo of tooth and one of the mesial edge 2)Serration density of both edges 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4) Locality: State and County Three Key Characteristics :. 1) Mesial Carina should extend down 2/3 First and most important since this is a Megalosaurid the anterior carina (serrations) only come 2/3 of the way down the keel. See Photo 2) Serrations on both edges should be different (Hendrickx 2005) The serrations are finer than most other large theropods in the Morrison. Morphologies I've recently seen published show the Distal carina at 4.6/mm and Mesial carina at 5.8/mm. So your tooth may not fit this exactly but there should be a difference with a ratio DSDI is higher than 1.2 in most specimens DSDI : Denticle size density index = Mesial Density ÷ Distal Density 3) Crown Base ratio These teeth are compressed and the ratio looks at that compression Crown Base Width (CBW) ÷ Crown Base Length (CBL) = between 0.45 and 0.65 Representation of teeth that are similar to Marshosaurus Reconstruction Skull of Marshosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw Reference: 1) Hendrickx, C., Mateus, O., and Araújo, R. 2015. The dentition of megalosaurid theropods. Acta Palaeontologica Polonica 60 (3): 627–642. 2)Journal of Iberian Geology June 2017, Volume 43, Issue 2 , pp 257-291 Analysis of diversity, stratigraphic and geographical distribution of isolated theropod teeth from the Upper Jurassic of the Lusitanian Basin, Portugal 3) Multivariate and Cladistic Analyses of Isolated Teeth Reveal Sympatry of Theropod Dinosaurs in the Late Jurassic of Northern Germany Oliver Gerke, Oliver Wings Published: July 6, 2016 https://doi.org/10.1371/journal.pone.0158334
  14. Ceratosaurus is one of my favorite Jurassic theropod Dinosaurs found in the Morrison Formation. Teeth of this and other theropods are commonly sold through online Dealers, Auction Houses and at Fossil shows. Just because a site/dealer sells Jurassic material does not guarantee accuracy. . Variation of the teeth in the jaw also adds to the complexity. Isolated teeth from the Morrison Formation are very difficult to diagnose and all require an understanding of additional characteristics than normal, in hopes of properly identifying them. I have not been able to find any publication that describes the teeth of this species, other than anterior ones, so it's beyond me how Sellers identify them. The best I can do is to look at other reference publications some which include similar teeth from Portugal and Germany which describe morph types and then assign them to the best taxon. So until we have a better definition this is a start to get us in the right direction Sellers need to provide you the following information: 1)Photo of tooth and one of the mesial edge 2)Serration density of both edges, 5 mm wide at midline 3)Dimensions: CBL, CBW, CH 4)Locality: State and County Premaxillary & Anterior teeth of Dentary Tooth: CHR : 2.47 - 3.56 Crown height ratio CH÷CBL CBR : .92 - 1.43 Crown base ratio CBW÷CBL Mesial Density: 19 per 5 mm, Distal Density: 11.5 per 5 mm all at midline, DSDI > 1.2 (Denticle Size Density index) Cross-section base : Subcircular Lingual grooves (flutes) are diagnostics and on the lingual side only. Gooves are only present on premaxillary and the anterior three teeth of the dentary. Lateral teeth Tooth: CHR : 1.54 - 2.86 Crown height ratio CH÷CBL CBR : .32 - .5 Crown base ratio CBW÷CBL Mesial Density: 14 per 5 mm, Distal Density: 14 per 5 mm all at midline Cross-section base : very compressed oval Mesial and Distal carina extend to the base If you would like to learn more about Ceratosaurs, bones and teeth there is a great soft covered printing. Ceratosaurs (Dinosauria, Theropoda) A Revised Osteology by Madsen and Welles by the Utah Geological Survey Its also available on PDF but the book is cheap and a great reference guide. If anyone has additional information to add to this please post it. Reconstruction Skull of Ceratosaurus from Utah Museum of Natural History. So you can see variation of the teeth in jaw Reference 1)Journal of Iberian Geology June 2017, Volume 43, Issue 2 , pp 257-291 Analysis of diversity, stratigraphic and geographical distribution of isolated theropod teeth from the Upper Jurassic of the Lusitanian Basin, Portugal 2)Multivariate and Cladistic Analyses of Isolated Teeth Reveal Sympatry of Theropod Dinosaurs in the Late Jurassic of Northern Germany Oliver Gerke, Oliver Wings Published: July 6, 2016 https://doi.org/10.1371/journal.pone.0158334
  15. Flower Fossils?

    A interesting new found. Late Jurassic fossil plant from Liaoning, China.
×