Jump to content

Search the Community

Showing results for tags 'middle jurassic'.

  • Search By Tags

    Type tags separated by commas.
    Tags should be keywords or key phrases. e.g. otodus, megalodon, shark tooth, miocene, bone valley formation, usa, florida.
  • Search By Author

Content Type


Forums

  • Community News
    • Member Introductions
    • Member of the Month
    • Members' News & Diversions
  • Fossil Discussion
    • General Fossil Discussion
    • Questions & Answers
    • Fossil Hunting Trips
    • Fossil ID
    • Partners in Paleontology - Member Contributions to Science
    • Fossil of the Month
    • Member Collections
    • A Trip to the Museum
    • Paleo Re-creations
    • Collecting Gear
    • Fossil Preparation
    • Is It Real? How to Recognize Fossil Fabrications
    • Member-to-Member Fossil Trades
    • Fossil News
  • General Category
    • Rocks & Minerals
    • Geology

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.)

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
  • Terry Dactyll's Blog
  • Sir Knightia's Blog
  • MaHa's Blog
  • shakinchevy2008'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
  • marksfossils' Blog
  • ibanda89's Blog
  • Liberty's Blog
  • Liberty's Blog
  • Lindsey's Blog
  • Back of Beyond
  • Ameenah's Blog
  • St. Johns River Shark Teeth/Florida
  • 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
  • Olenellus' Blog
  • nicciann's Blog
  • nicciann's Blog
  • 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
  • barnes' Blog
  • xenacanthus' Blog
  • myfossiltrips.blogspot.com
  • HeritageFossils' Blog
  • Fossilefinder's Blog
  • Fossilefinder's Blog
  • maybe a nest fossil?
  • farfarawy's Blog
  • Microfossil Mania!
  • blogs_blog_99
  • Southern Comfort
  • Emily's MotE Adventure
  • Eli's Blog
  • andreas' Blog
  • Recent Collecting Trips
  • retired 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?
  • 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
  • Hihimanu Hale
  • 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
  • Stocksdale's Blog
  • PaleoWilliam's Blog
  • TyrannosaurusRex's Facts
  • The Community Post
  • The Paleo-Tourist
  • 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
  • A Novice Geologist
  • 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
  • Books I have enjoyed
  • Ladonia Texas Fossil Park
  • Trip Reports
  • Glendive Montana dinosaur bone Hell’s Creek
  • Test
  • Stratigraphic Succession of Chesapecten

Find results in...

Find results that contain...


Date Created

  • Start

    End


Last Updated

  • Start

    End


Filter by number of...

  1. Mcmaker

    Big jurassic ammonite

    Howdy! I excavated big chunk (40 lbs) of jurrasic ammonite or nautilus(?). Could you help me identify it? Much appreciate
  2. bockryan

    Kosmoceras (Guliemiceras) jasoni

    From the album: Fossil Collection: DC Area and Beyond

    Kosmoceras (Guliemiceras) jasoni Gloucestershire, United Kingdom Oxford Clay Middle Jurassic
  3. Fullux

    Afrovenator?

    Howdy all, I'm interested in this Afrovenator abakensis tooth and am curious if it's legit. It was found in the Middle Jurassic Irhazer Shale of Agadez, Niger and is 1.3" long.
  4. Excellent new paper on theropod teeth, the Middle Jurassic area sampled suggests the presence of at least three distinct dromaeosaur morphotypes, plus a therizinosaur and troodontid. https://onlinelibrary.wiley.com/doi/full/10.1002/spp2.1487
  5. This was in a lot of El Mers fossils, but the Moroccan dealer was not sure what this was. It may not be anything, but just in case it's something unusual. It's about 2.6 cm (1.02 inch) in length Boulahfa, Boulemane, Morocco.
  6. Something that has been baffling me for a while is the fate of the European genera of Tyrannosauridae after the Mid Cretaceous. Multiple Tyrannosauridae genera including Proceratosaurus (Tyrannosauridae, England, Great Britain, Middle Jurassic (166 Million Years ago): ironically one of the earliest known Tyrannosauridae from the fossil record currently known), Eotyrannus (Tyrannosauridae, Wessex Formation, Isle of Wight, Early Cretaceous (136.4-125.45 Million Years ago)) and an unnamed Tyrannosauridae genera from Germany (Early Cretaceous (130.0-122.5 Million Years ago)) are known from Mesozoic deposits in Europe dating from the Middle Jurassic up to the Early Cretaceous. Holtz, Thomas (December 1998). "A new phylogeny of the carnivorous dinosaurs". Gaia. 15: 5–61. https://www.geol.umd.edu/~tholtz/gaiaphyl.pdf Hutt, Stephen & Naish, Darren & Martill, David & Barker, Michael & Newbery, Penny. (2001). A preliminary account of a new tyrannosauroid theropod from the Wessex Formation (Early Cretaceous) of southern England. Cretaceous Research. 22. 227-242. 10.1006/cres.2001.0252. https://citeseerx.ist.psu.edu/document?repid=rep1&type=pdf&doi=242e6d5f962a143900f3c8d2ff5eb20d6fe7482b K.-P. Lanser and U. Heinhofer. (2015). Evidence of theropod dinosaurs from a Lower Cretaceous karst filling in the northern Sauerland (Rhenish Massif, Germany). Palaeontologische Zeitschrift 89:79-94 https://www.semanticscholar.org/paper/Evidence-of-theropod-dinosaurs-from-a-Lower-karst-Lanser-Heimhofer/94860c34dedf8ac6d65759af9725ae76402eef59 But by the Late Cretaceous around 70-66 Million Years ago, they are absent from the fossil record in the region. Instead, the top predators of the region at the time seem to be Abelisaurs and large pterosaurs. Isasmendi, Erik & Torices, Angelica & Canudo, José & Currie, Philip & Pereda Suberbiola, Xabier. (2022). Upper Cretaceous European theropod palaeobiodiversity, palaeobiogeography and the intra‐Maastrichtian faunal turnover: new contributions from the Iberian fossil site of Laño. Papers in Palaeontology. 8. 10.1002/spp2.1419. https://onlinelibrary.wiley.com/doi/full/10.1002/spp2.1419 I’m curious on what could have caused this faunal turnover (especially since that between the Ealy Cretaceous (at the time of the known records of Tyrannosauridae from Europe) and the Late Cretaceous, Europe was basically a series of islands) or if they were still present in Europe during the Late Cretaceous and specimens have yet to be found or properly categorized? What do you guys think?
  7. Our Moroccan trip from 19th-23rd February 2019. Day One; Locality One IFRANE Here we are near Ifrane, a village built by the French in the 1930's in a Swiss chalet style so there are pointy roofs instead of the usual traditional flat roofs of Moroccan buildings. This is wifey and Anouar, a Moroccan tour guide, old friend and one time student of English, his brother, our driver Abdullah, is taking the photo. Anouar paid for the trip, accommodation and food in return for me teaching him a little about the fossils, crystals and minerals that we encountered. The trip was mainly an exploratory voyage for me to discover where was worth revisiting when i was alone and had more time to spare. Somewhere in this area are outcrops of Pleinsbachian (stage of the Liassic/ Lower Jurassic) rocks that are stuffed with terebratulid brachiopods including more than a dozen species and subspecies that were first described from this locality, many unique to the site. Unfortunately, it's well off the beaten track, but I think i know roughly where now, so will return another day. Not time today! The area is covered in loose rocks, ploughed up in fields and roadbuilding, eroded from outliers or washed into the area in the autumn rainy season floods or spring melts. The ones behind us look Middle Jurassic to me, yellowish limestones, some with iron staining. Upper Jurassic and Cretaceous rocks are also in the region. The high ridges in the background are basalt intrusions as the Atlas mountains were formed as Africa began to collide with Europe throughout the Palaoegene and Neogene and this resulted in a lot of volcanoes. We moved on north of the village and stopped where we saw a group of the local fossil huts. These are all year round businesses, but in the season, from May til October you will find little stalls selling local fossils and minerals all the way along the route through the Atlas Mountains to the Sahara. But the temporary stalls are all closed at this time of year, as it's pretty chilly and there are few tourists. Top Tip : Always pop into a couple of different shops and check out prices. Tell the next shopkeeper how much the previous one had stated and see if they'll undercut for a similar item. Always, always haggle! Top Tip : Ask which fossils and crystals are local if you don't know already; most of the shops in Morocco have local fossils and others from all over the country. Local fossils will usually be much cheaper, wait until you get nearer to the localities of other fossils and see the prices come down! Top Tip : If you have the time, ask the purveyors of local fossils to show you where they came from. Then go and have a look. They don't mind this at all.
  8. Day One ; Locality Three. Midelt 19th February 2019 The Berber nomads are hospitable, generous and very tough : The snow disappears soon after you get onto the High Plains between the Middle and High Atlas ranges. Here are the High Atlas looming in the distance : As one approaches the town of Midelt, the layered geology of what is mostly Dogger, the old name for the Middle Jurassic, still used here, becomes clear : Midelt is full of fossil shops, however most of the fossils, including a kazillion trilobites, actually come from elsewhere. Jurassic ammonites may be from here, and many of the small cut and polished ammonites are from around here, but Midelt is most famous for its minerals, vanadinite especially. Also lead ores, barite and flourite. Top Tip : Don't buy fossils in Midelt unless it's a cut and polished small ammonite you want. Minerals, yes, many are beautiful and very cheap. Hmm, this looks interesting................. "Stop the car!"
  9. Marco90

    Parkinsonia pachypleura

    From the album: My collection in progress

    Parkinsonia pachypleura Buckman 1925 Location: Saint-Benin-d'Azy, Bourgone-Franche-Comté, France Age: 168 - 166 Mya (Batonian, Middle Jurassic) Measurements: 4,2 cm (diameter) Kingdom: Animalia Phylum: Mollusca Subphylum: Conchifera Class: Cephalopoda Subclass: Ammonoidea Order: Ammonitida Suborder: Ammonitina Family: Parkinsoniidae
  10. Marco90

    Myophorella clavellata

    From the album: My collection in progress

    Myophorella clavellata Parkinson, 1811 Location: Villers-sur-Mer, Normandy, France Age: 166-163 Mya (Callovian, Middle Jurassic) Measurements: 2,8x1,7 cm Kingdom: Animalia Phylum: Mollusca Subphylum: Conchifera Class: Bivalvia Subclass: Palaeoheterodonta Order: Trigoniida Family: Trigoniidae
  11. paleoflor

    Araucaria mirabilis

    Old collection specimen. See this Wikipedia page for more information on Araucaria mirabilis from the Jurassic of the Cerro Cuadrado Petrified Forest, Argentina.
  12. There are additional unidentified conchostraca (clam shrimps, arthropods) on the slab. The age of the Daohugou strata has been notoriously difficult to determine, and a number of studies have produced conflicting results. Gao and Shubin reported an Argon-argon dating age of 164 ±4 million years ago (Middle to Late Jurassic, Bathonian to Oxfordian), this opinion is now widely accepted. Taxonomy according to Wei et al., 2012. Line drawing from Wei et al., 2012. Description according to Wei et al., 2012: “Small-sized, body length about 10.4–10.6 mm (with head), width 2.8–3.1 mm; head small, significantly elongated (length/width= 1.4–1.6 mm/1.3–1.4 mm), antennal socket conspicuous at sides, mouthparts unclear; pronotum length 1.6–1.9 mm, width 2.3–2.7 mm, elliptical, as wide as the body; abdomen 6–7 segments visible, terminal sternum rounded; long cerci has 14 segments and apex of cerci strongly curved inward and rounded in shape, forming a narrow gap at center (Fig 3A), segments of cerci joined together after the 8th segment. Forewings (Figs 1, 2, 3B): length range about 8.5–8.8 mm, width range about 2.6–2.9 mm; narrow, without coloration, with intercalaries and wing venation simple, with 30–32 veins at margin; costal area wide (1/3 width of the wing); Sc simple, curved upward, longer than clavus; R strongly curved like waves and with 9–14 branches, reaching the anterior wing margin; M slightly curved and with 5–7 branches, most posterior branch of M reaching wing apex; CuA almost straight to posterior wing margin and with 5–8 branches; CuP strongly curved and simple; clavus short, less than a third of the wing’s length; A simple, arc bending and with about 4 veins.” Identified by oilshale using Wei et al., 2012. References: Wei D. D., Liang J. H. and Ren D. (2012) A new species of Fuziidae (Insecta, Blattida) from the Inner Mongolia, China. ZooKeys 217: 53–61. Gao, K. -Q. and Shubin, N. H. (2012) Late Jurassic salamandroid from western Liaoning, China. Proceedings of the National Academy of Sciences. 109 (15): 5767–72.
  13. DD1991

    Steneosaurus revised

    A new fossil crocodylomorph-related paper is now available online: Johnson, M. M., Young, M. T., and Brusatte, S. L. (2020). Emptying the wastebasket: a historical and taxonomic revision of the Jurassic crocodylomorph Steneosaurus. Zoological Journal of the Linnean Society 189 (2): 428–448. https://doi.org/10.1093%2Fzoolinnean%2Fzlaa027 Michela Johnson and colleagues restrict Steneosaurus to the type species S. rostromajor, and make the teleosauroid snout MNHN 8900 the S. rostromajor lectotype (the skull fragment MNHN 8753 was later recognized as belonging to the metriorhynchid Metriorhynchus superciliosus) and they correctly recognize, as I had tacitly noticed, that Eudes-Deslongchamps (1867-1869) made an error in declaring that the Bathonian-age teleosauroid 'Steneosaurus' megistorhynchus best fulfilled the function of Steneosaurus type species not knowing that megistorhynchus was not an originally included nominal species of Steneosaurus. A Ph.D thesis written by Johnson last year regarding teleosauroids is available at this link: https://era.ed.ac.uk/handle/1842/36656 (Chapter 4 of the thesis by Johnson resurrects Macrospondylus for S. bollensis from the Toarcian of Europe and coins new genera for several taxa placed in Steneosaurus while revalidating Aeolodon and Sericodon, but I wouldn't disclose the names of the new genera until Chapter 4 is published, because doing so would be tantamount to stealing my thunder) In any case, Johnson and colleagues at long last figured out the concept of what the original Steneosaurus is, and given that Bathysuchus, Aeolodon, and Sericodon are much younger than the Steneosaurus type species, whereas Macrospondylus and a few other Early Jurassic teleosauroids are much older than rostromajor, it is apparent that the past assignment of many teleosauroid species to Steneosaurus is a historical accident and not reflective of biology reality, because Lemmysuchus is closer to Machimosaurus than to Steneosaurus or 'S.' edwardsi.
  14. Tidgy's Dad

    Ifrane, Morocco.

    Hi, gang. Some of you may remember the Southern Morocco trip I took in February. One of the places visited was quite near to me, about 70 km, lovely Swiss style mountain town called Ifrane where I found some Middle Jurassic brachiopods and echinoids. See http://www.thefossilforum.com/index.php?/topic/93193-ifrane-middle-atlas-morocco/&tab=comments#comment-1026671 A friend offered to drive me up there for the day so off we went I decided to check some outcrops on the other side of the road this time so went and had a peek.Sorry, no photos this time as wifey didn't come, she was ironing her money and she has the only camera phone. The first outcrop is an oyster bed crammed with enormous oysters. This is incredibly hard and couldn't be broken safely. (safely as in getting the fossils out in one piece, not my own personal well-being). But I was lucky enough to find this monster just lying a the base: Scale in inches it would seem. I think I can clean it up a bit. Eventually. After i'd dragged my broken carcass a few hundred whatevers further on, the limestone became yellower, softer but still pretty hard. Lots of broken shell material, a couple of ammonite bits, but the only salvageable items were these couple of rather nice gastropods; again, they should clean up a bit better: Oh, the scale's in centimetres this time. I felt like a change. You know, it's amazing how often I've given up on a days collecting and then, on the way back to the car, you find something just in your path that makes the trip. Here was mine this time : Forgot the scale altogether. Sigh. Maybe four or five centmetres diameter. Harpoceras, perhaps? It has a very pronounced keel. @Ludwigia Roger? I'll be able to prep this pretty well in 2046 when i get to my Jurassic stuff. Nothing spectacular, but it's always so nice to be out in the field collecting. Life's Good. Adam.
  15. Attached find a paper that eescribes a new theropod, Yunyangosaurus puanensis based on a fragmentary specimen recovered from the Middle Jurassic Xintiangou Formation of Chongqing, southwestern China. It shares several features uniquely with some megalosauroids https://www.nature.com/articles/s41598-019-56959-x
  16. Hey all, I thought I would make a thread to show some of my shark teeth that I have collected from the Oxford Clay formation (mainly the Peterborough Member), feel free to comment if I have misidentified anything! Pre-Apologies, some of them are quite small.. Cheers, Jacob.
  17. Not much is published on UK theropod teeth so its nice to see this one. Although the teeth are not in the best shape its good to understand what clads are being found. This paper reports on two new isolated theropod teeth discovered on the Isle of Skye, Scotland representing at least two species. https://sjg.lyellcollection.org/content/early/2019/04/30/sjg2018-020
  18. Ludwigia

    Finally got out again!

    The weather suddenly warmed up for a few days and started melting the snow, so I figured I'd grab the opportunity yesterday and check out the Geisingen area as long as the weather held. It's supposed to get colder again next week, so I thought I'd try to take advantage before more snow gets dumped on us. This was my first sojourn in over a month, so I was just glad to get out into the field, even if it didn't pan out much. I'd heard that a group had been digging with some success at the clay pit, so I thought I'd have a look-see to at least assess the situation there. It turned out that the spot where they had dug was pretty obvious, but the clay from above had slid down and buried it, which would make for a days work for a group of 4. I then decided to explore the old north end of the pit in the hopes that slips had perhaps created some new exposures, didn't find any though, so I doubled back down the east edge to a spot where I'd found some loose blocks in the distant past and started scratching around a bit. Luck was with me this time in the form of a nicely weathered block which gave up 3 well-preserved ammos and a few bivalves. I was needless to say already more than satisfied with these results, but since it was still early in the afternoon, I decided to check out a field nearby which had been productive in the past. I had noticed while driving past it on the way to the pit that it had been freshly plowed. This also turned out to be a good decision. I ended up after a couple of hours with a mini sack full of ammos in varying conditions of preservation, some in matrix, some free. All in all, it was a good day, so my itch has been stilled for another month or so, I would say. I didn't think to take my camera along again , so there are no in situ pictures, but I can at least provide you with a photo of the finds and I promise to post some of them once they're prepped.
  19. Dpaul7

    Ichthyosaur Paddle Bone 1.JPG

    From the album: MY FOSSIL Collection - Dpaul7

    Ichthyosaur Paddle Bone Weymouth Harbour, Dorset, United Kingdom Middle Jurassic (160 Million Years) Ichthyosaurs (Greek for "fish lizard" ) are large marine reptiles. Ichthyosaurs belong to the order known as Ichthyosauria or Ichthyopterygia ('fish flippers' – a designation introduced by Sir Richard Owen in 1840, although the term is now used more for the parent clade of the Ichthyosauria). Ichthyosaurs thrived during much of the Mesozoic era; based on fossil evidence, they first appeared around 250 million years ago (Mya) and at least one species survived until about 90 million years ago, into the Late Cretaceous. During the early Triassic period, ichthyosaurs evolved from a group of unidentified land reptiles that returned to the sea, in a development parallel to that of the ancestors of modern-day dolphins and whales, which they gradually came to resemble in a case of convergent evolution. They were particularly abundant in the later Triassic and early Jurassic periods, until they were replaced as the top aquatic predators by another marine reptilian group, the Plesiosauria, in the later Jurassic and Cretaceous periods. In the Late Cretaceous, ichthyosaurs became extinct for unknown reasons. Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: †Ichthyosauria
  20. Dpaul7

    Ichthyosaur Paddle Bone 1.JPG

    From the album: MY FOSSIL Collection - Dpaul7

    Ichthyosaur Paddle Bone Weymouth Harbour, Dorset, United Kingdom Middle Jurassic (160 Million Years) Ichthyosaurs (Greek for "fish lizard" ) are large marine reptiles. Ichthyosaurs belong to the order known as Ichthyosauria or Ichthyopterygia ('fish flippers' – a designation introduced by Sir Richard Owen in 1840, although the term is now used more for the parent clade of the Ichthyosauria). Ichthyosaurs thrived during much of the Mesozoic era; based on fossil evidence, they first appeared around 250 million years ago (Mya) and at least one species survived until about 90 million years ago, into the Late Cretaceous. During the early Triassic period, ichthyosaurs evolved from a group of unidentified land reptiles that returned to the sea, in a development parallel to that of the ancestors of modern-day dolphins and whales, which they gradually came to resemble in a case of convergent evolution. They were particularly abundant in the later Triassic and early Jurassic periods, until they were replaced as the top aquatic predators by another marine reptilian group, the Plesiosauria, in the later Jurassic and Cretaceous periods. In the Late Cretaceous, ichthyosaurs became extinct for unknown reasons. Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: †Ichthyosauria
  21. Dpaul7

    Ichthyosaur Vertebra a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Ichthyosaur Vertebra SITE LOCATION: Weymouth Harbour, Dorset, United Kingdom TIME PERIOD: Middle Jurassic (160 Million Years) Ichthyosaurs (Greek for "fish lizard" ) are large marine reptiles. Ichthyosaurs belong to the order known as Ichthyosauria or Ichthyopterygia ('fish flippers' – a designation introduced by Sir Richard Owen in 1840, although the term is now used more for the parent clade of the Ichthyosauria). Ichthyosaurs thrived during much of the Mesozoic era; based on fossil evidence, they first appeared around 250 million years ago (Mya) and at least one species survived until about 90 million years ago, into the Late Cretaceous. During the early Triassic period, ichthyosaurs evolved from a group of unidentified land reptiles that returned to the sea, in a development parallel to that of the ancestors of modern-day dolphins and whales, which they gradually came to resemble in a case of convergent evolution. They were particularly abundant in the later Triassic and early Jurassic periods, until they were replaced as the top aquatic predators by another marine reptilian group, the Plesiosauria, in the later Jurassic and Cretaceous periods. In the Late Cretaceous, ichthyosaurs became extinct for unknown reasons. Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: †Ichthyosauria
  22. Dpaul7

    Ichthyosaur Vertebra a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Ichthyosaur Vertebra SITE LOCATION: Weymouth Harbour, Dorset, United Kingdom TIME PERIOD: Middle Jurassic (160 Million Years) Ichthyosaurs (Greek for "fish lizard" ) are large marine reptiles. Ichthyosaurs belong to the order known as Ichthyosauria or Ichthyopterygia ('fish flippers' – a designation introduced by Sir Richard Owen in 1840, although the term is now used more for the parent clade of the Ichthyosauria). Ichthyosaurs thrived during much of the Mesozoic era; based on fossil evidence, they first appeared around 250 million years ago (Mya) and at least one species survived until about 90 million years ago, into the Late Cretaceous. During the early Triassic period, ichthyosaurs evolved from a group of unidentified land reptiles that returned to the sea, in a development parallel to that of the ancestors of modern-day dolphins and whales, which they gradually came to resemble in a case of convergent evolution. They were particularly abundant in the later Triassic and early Jurassic periods, until they were replaced as the top aquatic predators by another marine reptilian group, the Plesiosauria, in the later Jurassic and Cretaceous periods. In the Late Cretaceous, ichthyosaurs became extinct for unknown reasons. Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: †Ichthyosauria
  23. Dpaul7

    Ichthyosaur Vertebra a.jpg

    From the album: MY FOSSIL Collection - Dpaul7

    Ichthyosaur Vertebra SITE LOCATION: Weymouth Harbour, Dorset, United Kingdom TIME PERIOD: Middle Jurassic (160 Million Years) Ichthyosaurs (Greek for "fish lizard" ) are large marine reptiles. Ichthyosaurs belong to the order known as Ichthyosauria or Ichthyopterygia ('fish flippers' – a designation introduced by Sir Richard Owen in 1840, although the term is now used more for the parent clade of the Ichthyosauria). Ichthyosaurs thrived during much of the Mesozoic era; based on fossil evidence, they first appeared around 250 million years ago (Mya) and at least one species survived until about 90 million years ago, into the Late Cretaceous. During the early Triassic period, ichthyosaurs evolved from a group of unidentified land reptiles that returned to the sea, in a development parallel to that of the ancestors of modern-day dolphins and whales, which they gradually came to resemble in a case of convergent evolution. They were particularly abundant in the later Triassic and early Jurassic periods, until they were replaced as the top aquatic predators by another marine reptilian group, the Plesiosauria, in the later Jurassic and Cretaceous periods. In the Late Cretaceous, ichthyosaurs became extinct for unknown reasons. Kingdom: Animalia Phylum: Chordata Class: Reptilia Order: †Ichthyosauria
×
×
  • Create New...