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Found 13 results

  1. Hello dear members, Today I'd like to talk about my latest fieldtrip, to the Late Triassic tracksite of Zone, Lombardy prealps, Italy. However, I'd like to make it clear that it involved no fossil collecting, because of the scientific interest of the site and of italian laws, that prevent (almost) any form of this activity. I know there is the "Fossil sites" section, but I thought that here my post would have reached more people. I apologize in case this is not allowed. Let's not waste any more time! Italy is quite well know for its tracksites, in particular those bearing dinosaur tracks: Altamura (the largest tracksite in Europe!) and Lavini di Marco, just to give an example. On the other hand sites of Late Triassic age, bearing archosaurian footprints are poorly documented. Zone is a tiny village located nearby the Lake Iseo, in the Southern prealps, some 80 km (50 mi) east of Milan (see the red arrow on the map below). Back in the Late Triassic (Carnian) this area was an alluvial fan, characterized by a semiarid climate and, further to the south, by the occurrence of a series of volcanic edifices. Tracks are, in fact, preserved in terrigenous-volcaniclastic beds. Ripple marks and groove casts can be found too. The material is represented by a total of about 70 footprints, arranged in six trackways on two different layers. The older displays three trackways that cross each other, the younger three distinct trackways. Footprints are only moderately preserved, nonetheless several anatomical details are evident on those of the younger level. In addition to traditional mapping methods, a laser scanner was employed to obtain high-quality 3D digital models. Let's talk about who left this footprints for us to admire! Those of the younger level are referred to a quadrupedal trackmaker with plantigrade, pentadactyl pes (distal portion of the hind limb) and manus (distal portion of the fore limb). They have been assigned to the ichnogenus Brachychirotherium, known by a global distribution and probably left by a crurotarsan archosaur. It is not clear whether it was a rauisuchian (predator) or an aetosaur (armored vegetarian). On the field, I must admit that I was a little disappointed. Judging by the pictures published in the 2009 paper that described the outcrop, at least two trackways were quite distinct and visible. However, that was not the case: only 4 tracks (two manus and two pes) were indeed immediately identifiable. I guess that's possibly due to two factors: on the one hand weathering (the fine grained sandstone is very fragile), on the other hand inclination of solar rays. Tracks are best visible in raking light, but I visited at around 10-11 am in a clear February day. In the summer period I'm quite sure that much more could be seen!! In order to highlight the footprints and compare with the presente state, I chose to show also a pictures taken from the paper: you can distinghuish it easily, because it is in b/w. Today this is the best that you could ask for in this section (older layer) The overall best preserved manus-pes track, in the younger layer. Reconstruction of this set of footrprints Close up of the Manus, scale bar is 5 cm (2 in). total lenght of the track: some 30 cm (11,8 in). The second best preserved manus-pes association Reconstruction of a rauisuchian (on the left) and an aetosaur (on the right). On top lower right digital model of the best preserved trackway (I showed you the picture of the first two sets of imprints). A rauisuchian The significance of the Zone tracksite is that it represents the first definite ichnological record of archosaur tracks found in Lombardy and footprints are among the best preserved, although an upcoming paper is going to feature recently found tracks that are even better preserved (and I gave my contribution in the excavation campaign!). On the field, I must admit that I was a little disappointed. Judging by the pictures published in the 2009 paper that described the outcrop, at least two trackways were quite distinct and visible. However, that was not the case: only 4 tracks (two manus and two pes) were indeed immediately identifiable. I guess that's possibly due to two factors: on the one hand weathering (the fine grained sandstone is very fragile), on the other hand inclination of solar rays. Tracks are best visible in raking light, but I visited at around 10-11 am in a clear February day. In the summer period I'm quite sure that much more could be seen!! Anyway, it was a great experience: easy access, few people walking by, great scientific value! I hope that you liked my short report, Fabio
  2. Dinosaur footprints

    Found these in East Central Arizona. A deep wash has cut through a rock ledge containing lots of the footprints. Still working on trying to get some of the bigger rock slabs hauled out.
  3. Hi! I recently aqcuired quite a lot of "microfossils" to kick off my Triassic collection, as I personally find it one of the most interesting time periods and while I am aware possibly not all of them are ID'd correctly I just wanted to get some nice fossils from this time period regardless of their ID's. All the fossils I acquired are from the Bull Canyon Formation, Dockum Group, San Miguel County, New Mexico, USA (Norian age) But I myself am not very knowledgeable yet in this material as I just started my collection but I am aware that some if not most of the ID's on these fossils given by the seller might be wrong as everything I read about the Bull Canyon formation says that the formation isn't that well discribed yet. I tried to make the photo's as good as I could, but it wasn't always easy given their extremely small size, so I hope the quality is good enough to work with. So I am kinda hoping is someone here on the forum would like to give it a try to see if he/she could confirm or disprove given ID's. Thank you in advance! The first set of 2 teeth were listed as the Phytosaur "Pseudopalatus" teeth which after doing a bit of research is considered a junior synonym for "Machaeroprosopus" The next collection of 3 teeth were listed as the Pseudosuchian "Revueltosaurus" The next tooth was listed as a "Theropod indet" tooth, and I know there are at least 2 species of theropod present at Bull Canyon, a Coelophysid called Gojirasaurus and a herrerasaurid called Chindesaurus. But I am not even sure whether this tooth is dinosaurian or not. The next set of teeth were listed as "Arganodus" lungfish teeth And the final tooth was listed as a "Sphenodont" (Rhynchocephalia indet.) tooth with affinities to Clevosaurus (which is found in Nova Scotia, Great Britain and China)
  4. Meet the Antarctic king

    https://www.eurekalert.org/pub_releases/2019-01/fm-idc012319.php http://blogs.discovermagazine.com/deadthings/2019/01/31/antarctanax/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A DiscoverBlogs (Discover Blogs)
  5. Triassic Vert (Coelophysis?)

    Hello all, I just picked up this pretty vert and am not quite sure about the ID. The seller advertised it as Coelophysis, but it doesn't seem to be a match. It's from Bull Canyon formation, Quay County, New Mexico (Upper Triassic). It measures 2 1/2". The seller provided good pictures, so I've attached some of those. I can provide more and even take some of my own if needed! Thanks, and hopefully we can figure out an ID on this one!
  6. Early- and Mid-Cretaceous Archosaur Localities of North-Central Texas. Guidebook for the field trip held October 13, 2015 in conjunction with the 75th Annual Meeting of the Society of Vertebrate Paleontology in Dallas, Texas https://www.researchgate.net/publication/283711331_Early-_and_Mid-Cretaceous_Archosaur_Localities_of_North_Central_Texas https://figshare.com/articles/Early_and_Mid_Cretaceous_Archosaur_Localities_of_North_Central_Texas/1608173 http://chrisnoto.com/publications.html Yours, Paul H.
  7. you can't make an omelet

    Marz, 2014.HiBioolicrocodilian eggs and eggshell structures..pdf
  8. Rauisuchians are some of my favorite prehistoric beasts, rather specific but I'm wondering if anyone on here on the forum has any material to show I'd love to see. So far I've been only able to obtain postosuchus teeth and recently begrudgingly missed out on some Batrachotomus kupferzellensis.
  9. PDF versions of Archosaur Site Publications

    Some publications about the Arlington Archosaur Site by the late Dr. Derek J. Main are: The Arlington Archosaur Site Field Trip Guide 2013 Derek J. Main, Ph. D. University of Texas www.arlingtonarchosaursite.com PDF files at: https://uta.academia.edu/DerekMain https://www.academia.edu/2607656/Arlington_Archosaur_Site_-2013_Field_Trip_Guide Paleoecology & Paleoenvironments of the Woodbine Formation of North Texas: the Arlington Archosaur Site Earthwatch Field Trip GuideSummer 2012 Derek J. Main & Christopher R. Noto PDF files at: https://uta.academia.edu/DerekMain https://www.academia.edu/1964508/Paleoecology_and_Paleoenvironments_of_the_Woodbine_Formation_in_North_Texas_the_Arlington_Archosaur_Site._Earthwatch_field_trip_guide_summer_2012 Main, D.J., 2013. Appalachian Delta Plain Paleoecology Of The Cretaceous Woodbine Formation At The Arlington Archosaur Site, North Texas. Unpublished PhD dissertation, University of Texas at Arlington. 548 pp. PDF files at: https://uta.academia.edu/DerekMain https://www.academia.edu/3568978/APPALACHIAN_DELTA_PLAIN_PALEOECOLOGY_OF_THE_CRETACEOUS_WOODBINE_FORMATION_AT_THE_ARLINGTON_ARCHOSAUR_SITE Yours, Paul H.
  10. it's live!

    junbentaitchis2017vivrity.pdf Don't worry about the quality of the content,the source is reliable(I'm reliably informed)
  11. First of all, hello to all of you on the Fossil forum- My name is Erik. newbie here, first post. Secondly, I'm exceptionally curious as to what organism in the fossil record has the first confirmed gastrolith (non-exolith) presence. I found and read through Fruitbat's research, and he had some very interesting articles about gastroliths, some of which I've seen, some of which I have not. I feel that Gastroliths are incredibly important to Archosaur evolution because they fulfill much the same role that differentiated teeth for thorough mastication do in mammals. Of course, proving that a differentiated tooth came from a synapsid is much, much easier than proving a gastrolith found outside of any skeletal remains (an exolith) came from an Archosaur. I'm sure many of you know most of this already... any information you can provide would be appreciated.
  12. My profile on: Stegosaurus

    Here is another peice of my work, this profile is on the Stegosaurus and once again I would like to see what you all think but keep in mind I kind of wrote this in a biased way, as in I used the theories I think are true without mentioning other ones so Forgive me for that. But hey, At least it's pretty simplified. Stegosaurus is one of the Most well known of all dinosaurs along with the T.rex and the Velociraptor. Despite this very, very, very, few people know what it actually looked and behaved like. For example the Stegosaurus has Sexual Dimorphism which means a difference in the males and female's. Females have sharp pointed Plates along its back while the males back plates would be rounded kind of like a squashed circle. Stegosaurus is part of the Stegosauri family that arrived on the scene in the early Jurassic and died out at the end of the Jurassic Period. Stegosaurus grew to be 30 feet long and 9 feet tall which 3 foot long plates and 3 foot long thagomizers which were the spikes at the end of the tail, that it used for self defense. Stegosaurus has extremely small heads even for a Stegosaurs, They fed on Fern cycads and Conifers which were the dominant plant species in the Jurassic period in North America. Another thing, Stegosaurus is native to North America in places such as Wyoming and South Dakota along with animals like Brachiosaurus and the Brontosaurus Stegosaurus also have a thick armor on its neck represented by thick rock like scales. While the bone plates and thagomizers in the skeleton are large, they were much larger in life as they were covered in keratin and thick sponge bone like material. It's notable to mention that Stegosaurus tail spikes called thagomizers are at the tip of the tail and unlike many archosaur tails which get thicker and stiffer near the end instead are very flexible like the tail of a monkey in order to swing around their thagomizers with great accuracy against predators, killing a Allosaur in one blow or at least wounding it badly. Fossil Records of Allosaurus show puncture woulds in areas like the leg or against the pubic bone which is part of Pelvis. These were caused by the Stegosaurus which was defending itself or a baby, Now while they have these large spikes to protect themselves they also have these large kite shaped sponge plates which were not protection but was used for Courtship for females and to confuse predators, This means it would flush blood into its plates and they would turn to bright red along with other colors, the body would likely be green or brown while the plates would have bright colors much like a Baboons Colorful face. Stegosaurus was discovered by the Famous Charles Marsh in 1877 and Stegosaurus had this very wide gap of space in between its hips and Marsh thought in this space it had a Secondary brain. Now he thought this because this elephant size animal had the brain the size of a dogs brain. He thought this was not enough and he had to had a secondary brain to help it function. Not true it did not have a second brain and no dinosaur or reptile ever had a second brain.
  13. I found this tooth while searching my collection of Sussex Wealden, Hastings bone bed. Similar to the small size ornithopod dinosaur Hypsilophodon premaxilla teeth, but this species can be ruled out. It is more similar to the small ornithopod Echinodon, Purbeck beds, Dorset premaxilla teeth. The crown is smooth and asymmetrical. The root curls up at the end, similar to some Iguanodon teeth in original early illustrations of the Iguanodon species. I prepped the tooth out completely from the matrix. Tooth is very small being 5mm long. Can anyone help me with identification of this tooth?