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  1. Hey hope y'all are doing well! Seems like I've been absent from here quite some time, huh? Between a rather intense semester at uni, and research work for the GeoCenter museum in Denmark, it's been a pretty darn busy past few months... But I'm back now, with some neat updates about the paleo stuff I've been up to lately Can't wait to browse through all the different TFF threads from the last weeks, too! The biggest thing I got up to - I participated for the first time in a paleontology conference!! It was really fun, I got to meet other up-and-coming paleontologists, took a workshop led by the brilliant Phil Mannion on how to better use the Paleobiology Database - and most importantly, there were some truly excellent talks about all sorts of interesting topics: unusual structures in mosasaur vertebrae, Silurian benthos paleoecology, resolving pterosaur taxonomy... I like to think that my talk was pretty good too, it garnered quite a bit of attention I presented Thoracosaurus crocodile bones from the Late Cretaceous chalk site Møns Klint (Denmark). My main conclusions were that the bones represent the oldest European gavialoid - and reveals that the transatlantic distribution of gavialoid crocs dates back at least to the early Maastrichtian. The Møns Klint specimen is also significant because crocs are simply darn rare in the chalk of Denmark, so new finds are really important to better understanding the paleoecology of the sea that covered Denmark and NW Europe in the Late Cretaceous. For those who are curious, here's a recording of my talk Hope you enjoy it!
  2. The Amateur Paleontologist

    I'm gonna be participating in a conference!!

    Just wanted to share this bit of good news with you guys - I was accepted, some time ago, to present at a paleo conference The conference, Progressive Palaeontology 2021, is organised by the Palaeontological Association and is hosted (online) by the University College London (my uni!). It runs from tomorrow until the 19th. Although registration is now closed, some talks will be uploaded to Youtube (it's possible for presenters to ask to have their talks stay up on Youtube, publicly, even after the event has finished). Now although the conference is mostly for master's and PhD students, I thought I'd still go ahead with trying my hand at getting into the conference. I'm so delighted I got accepted! For those who are curious, this is the title and abstract of my talk: Historical material of cf. Thoracosaurus from the Maastrichtian of Denmark provides new insight into the K-Pg distribution of Crocodylia Crocodylia is one of the distinctive groups that survived the K–Pg mass extinction event. New material from Late Cretaceous–early Palaeogene deposits is therefore important to understanding shifts in crocodylian distribution and ecology. This paper describes and assesses a fragmentary mandible of a marine crocodylian from the lower Maastrichtian (Late Cretaceous) of Møns Klint (Denmark). Based on features including narrow rami and curved, slender, and conical teeth, the specimen is referred to cf. Thoracosaurus (Gavialoidea). Although collected in 1968, the material has not yet been described. However, given its importance to crocodylian palaeontology, the specimen warrants further attention. This research aims to systematically present the palaeobiogeographical significance of the fossil material, assessed using digital palaeolatitudinal reconstruction. The Møns Klint specimen represents the oldest gavialoid record in Europe, with all other material deriving from upper Maastrichtian and Danian deposits. This indicates that Gavialoidea were present in the European Chalk Sea throughout the Maastrichtian, rather than being a latest Maastrichtian arrival. Furthermore, the Møns Klint ‘Thoracosaurus’ represents one of the only lower Maastrichtian gavialoids, the other two being from Mississippi and New Jersey (United States of America). The specimen thus extends the palaeogeographical range of lower Maastrichtian gavialoids across the proto-Atlantic and by ~7º in palaeolatitude. This reveals a transatlantic distribution of Gavialoidea dating back to the earliest Maastrichtian, providing further evidence for distributional communication between vertebrate faunas of the Western Interior Seaway and of the Chalk Sea. These factors therefore make the Møns Klint Thoracosaurus specimen particularly valuable to understanding distributional patterns of K–Pg crocodylians. I'm especially pleased that after several years, some of my research on the marine fauna from the late Cretaceous chalk of Møns Klint is finally getting "out there", into the academic/public world. A small step of progress for my Møns Klint Fossil Research Program! It'll also of course be great to see many talks on fascinating aspects of paleo research, exchange with paleontologists, and participate in workshops!! I'll make sure to post on TFF the recording of my talk once it's made publicly available Really can't wait for this, I'm so excited!! -Christian
  3. The Amateur Paleontologist

    The giant mosasaur Prognathodon is now known from Denmark!

    A paper was recently published announcing the presence of Prognathodon in the Late Cretaceous chalk of Denmark. Prognathodon was a large, predatory mosasaur, well-known in the USA and Morocco, but known from other places e.g., the Netherlands. This new study is especially quite a big deal, because mosasaur fossils are incredibly rare in the Danish chalks. Prognathodon is now the 4th mosasaur known from the Late Cretaceous of Denmark, along with Mosasaurus, Plioplatecarpus and Carinodens. The Danish material is represented by two teeth - one of them being from the fossil site I study, Møns Klint! It's quite exciting that more and more research on the Late Cretaceous vertebrates of Denmark is being done The two danish Prognathodon teeth. The larger one (A-D) was found at Møns Klint, the smaller one (E-H) was found at Stevns Klint. These would have originated from 7.5- and 4-metre long mosasaurs, respectively. This is the new paper describing the mosasaur material: Giltaij, T.J., Milàn, J., Jagt, J.W.M. & Schulp, A.S. (2021). Prognathodon (Squamata, Mosasauridae) from the Maastrichtian chalk of Denmark. Bulletin of the Geological Society of Denmark, vol. 69, pp. 53–58. You can download the paper from here : https://2dgf.dk/publikationer/bulletin/bulletin-69-2021/#3 Hope you enjoyed this "Made-in-Denmark" mosasaur news -Christian
  4. Hey everyone, hope you're all doing well! From what I've read, small shark/fish teeth can be occasionally encountered by dissolving samples of chalk/limestone in acid. I read Jeppsson et al's 1999 paper on using buffered acetic acid to extract phosphatic fossils (in my case shark teeth), but the method outlined is not that simple and requires access to certain laboratory equipment I don't really have access to right at the moment... All I have is some cheap white vinegar, and some trays and tins I've got some samples of chalk from the Late Cretaceous of Møns Klint, a fossil site in Denmark with relatively diverse fish and shark fauna. Here's the thing - would it be OK to put the samples of chalk in white vinegar (acetic acid)? If it is, I've just got some questions -- Should I dilute the vinegar? And if so, by how much? How long should I leave the chalk in the vinegar? Any suggestions and ideas would be much appreciated, I'd love to find some little fish and shark teeth. Christian
  5. The Amateur Paleontologist

    Need help in identifying problematic fish bone

    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
  6. Hey everyone - hope you're all doing Just thought I'd share with you guys a chart I made, comparing the sizes of various marine reptile species known from the Maastrichtian chalk of Møns Klint (~70 million years old - Hvidskud Member of the Møns Klint Formation). For now, there are only 3 reptile species known from MK. But who knows, that number might increase now that more in-depth collection and research is taking place over there Anyways... onto the size comparison chart - here it is: Details: The Mosasaurus hoffmannii is known from one very well-preserved pterygoid ('palate') tooth crown (belongs to the Danish Museum of Natural History/NHMD, but on loan to the GeoCenter Møns Klint/GCMK). M. hoffmannii is estimated to have reached ~17 metres, though the one in this chart represents a smaller-sized individual (~12m). The M. cf. lemonnieri is known from an excellently preserved tooth crown (belongs to NHMD but on loan to GCMK). Other fragmentary, eroded mosasaur teeth (2 or 3) are known from Møns Klint, and they might belong to either M. lemonnieri or M. hoffmannii The possible Thoracosaurus (crocodylian) is known from a partial mandible, with 2 tooth imprints associated (I'm currently describing that fossil, and soon hope to have the paper sent for publication ) Known remains are shown in white (teeth for the mosasaurs, partial mandible for the crocodile). Note: the reptile outlines are not mine, I modified them from some that were made by DeviantArt users paleosir and PWNZ3R-Dragon. Hope you liked this size comparison chart! -Christian
  7. The Amateur Paleontologist

    Narrative Essay: Resurrecting the Cretaceous

    Looking through @KansasFossilHunter's blog, I saw one of his posts was a "narrative essay" (you should check it out, it's really good! ). This gave me the idea to write an account of one of my MKFE fossil hunts. I hope you guys enjoy it! Resurrecting the Cretaceous The fine, almost mist-like rain fell gently in sheets and imbued the skin of my face. Despite the lack of intensity, this slow downpour had been going on for the past half hour, and water was starting to seep through my clothing. I was beginning feel very cold. A loud metallic clank (presumably from a hammer) brought me back to the task at hand. I looked around. In front of me, the white chalk cliffs of Møns Klint towered, shrouded in a veil of thick fog. I could hear behind me the sound of waves ploughing through innumerable pebbles of flint. The entire atmosphere felt… otherworldly – I was almost expecting to see the large head of a mosasaur, breaching through the turbulent waters of the Tethys- no, the Baltic sea. Indeed, this cliff was highly fossiliferous – it could almost be considered as some marine “graveyard” from the Late Cretaceous. I got back to work. I was currently excavating a tubular and hollow fossil. At the time, I couldn’t identify it. With the aid of small dental tools, I chipped the soft rock encapsulating the fossil. I felt the fragment come loose, and tensed in anticipation as I gently pried the fossil from its chalky tomb. As I began to safely wrap it in kitchen paper, I looked momentarily back at the excavation site and saw something rather unexpected: the same pattern of the fossil I had just pulled out of the rock. There was more of this fossil. Armed with my small metallic pick, I continued working around the unidentified invertebrate fragment. What was it? Some weirdly preserved crinoid? Focus, Christian. You can ID it later. This was getting very strenuous. The cold, the exhaustion… I toiled on, nevertheless, with grim determination. Shortly after, I got another fragment out of the chalk. This stuff was really brittle, it was already starting to crumble in my hands as I was wrapping it. If only I had taken some PVA. As I thought that that was the end of it, I went back to the cliff wall to gather my tools. I looked back up. Don’t tell me… The fossil was still continuing! Alright then. Time to get out the big guns. Ignoring my family’s requests that I speed up a bit (fossil excavation takes time, alright?), I picked up my hammer and chisel. Small wet bits of chalk flecking my coat, I started hammering off chunks of chalky overburden. I repositioned my chisel so as to slightly modify the angle at which I was striking the rock. I soon saw a thin crack appearing, meaning that the piece of rock containing the fossil was starting to come loose. I gave a few more taps with my hammer, and then pried off the matrix-surrounded fossil. It really wasn’t surprising that there was still more of the fossil in the cliff face. Let’s hope this is the last bit. After all, the visible diameter of this invertebrate seemed to have decreased as I uncovered more of the fossil. Reiterating the work I had been doing up until now, I pried rock from around the “calcareous tube”. Just as I was asking myself if this fossil would ever reach an end, the rock started to come loose. Once the fossil was wrapped in kitchen paper, I looked back at the cliff wall. There was no more trace of the fossil. Finally. I used my dental pick to scrape a bit around, just to make sure. We packed up the fossils and gathered the tools, ready to leave – and say goodbye to Møns Klint I was going to miss that place. Just as we were about to head up the long cliff-front staircase to get back to the parking, my mum picked up a large block of chalk for me to work on – once back at home. Why hadn’t I thought about that before? Safely seated in my parents’ car, I looked out of the window. The atmosphere still felt “prehistoric”: the slight hint of fog, the damp trees shivering in the wind, even the bumpy dirt road… At this moment, I really wouldn’t have been surprised to see a flock of small velociraptorine dromaeosaurs, crashing through the undergrowth and rushing to the opposite side of the road. It was almost as if my fossil excavations had brought back to life animals long gone, from the Late Cretaceous. N. B. Subsequent research indicated the fossil I was excavating was a serpulid polychaete Field photography of the in situ serpulid (in the black circle). The end of a chisel is in the left
  8. Hey everyone - It's Christian. For the past few months, I was inactive on TFF as I had a lot of schoolwork.. But now, I've got a lot more time on my hands - which means that I can get back to all things fossil related This of course includes making preparations for my 3rd Møns Klint Fossil Excavation (MKFE - the fieldwork aspect of my Møns Klint Fossil Research Program). I'll be going for 2 weeks, in mid-August - I'm really excited! As I said in a post from a few months ago, the collection policy of this MKFE is essentially the same as last time's (cephalopod, crustacean, echinoderm and vertebrate material). This time, though, there'll be a bigger focus on articulated and/or associated material - eroded sea urchin spines and belemnite fragments are getting too numerous... On the first days of the field trip, I'll have to do quite a bit of prospecting for new sites to work at, because there's a chance that the landslide spoil heap from last year has most likely been washed away by the waves. I'm already having some ideas of particular projects for this field trip, which include a comprehensive collection of washout microfossils - to determine relative abundances of various faunal groups. Another project is the in-depth analysis of fossil material from different layers of chalk - which I hope will yield some zone fossils. Of course, I'm still hoping to find a lil' mosasaur tooth I'll also use this field trip as an opportunity to donate to the GeoCenter Møns Klint some of the fossils I found during the 2nd MKFE. I'll keep you guys posted! Stay tuned I'm so excited to getting back there! -Christian
  9. The Amateur Paleontologist

    Plans for the 3rd Møns Klint Fossil Excavation

    Nowadays, I'm mostly focused on preparing for my high school finals. But in my free time... Well I started to plan the 3rd Møns Klint Fossil Excavation (MKFE), as part of the larger Møns Klint Fossil Research Program. This field session has been planned for mid-August, and will last about 2 weeks - needless to say, I'm pretty excited Especially when considering the success of the 2nd MKFE... Collection policy will remain mostly the same as last time, meaning that arthropod, cephalopod, echinoderm and vertebrate material will be the priority. Of course, there will be a slight change; with more focus on articulated/associated remains (because single, eroded fragments are becoming a bit too numerous...). Also, last year, when I was collecting anything significant (e.g. articulated echinoderm remains), I forgot to try and find associated zone fossils. This time, I'll remember to collect zone fossils (brachiopods and belemnites), as they can be pretty useful for determining more precisely the age of a specimen. Of course, I'll use this field trip as an opportunity to donate to the GeoCenter museum some of the fossils from the 2nd MKFE. Can't wait to go back there!! -Christian
  10. Hey everyone, I'm back from my second Møns Klint Fossil Excavation - it was absolutely fantastic! For the majority of 2 weeks, I was down at the chalk cliffs of Møn; and recovered quite a sizable quantity of (mostly echinoderm) good-quality fossil material. All of it is still safely stowed away in ice cream boxes and kitchen paper "field jackets", but I can not wait to getting down to preparing all those fossils. Unfortunately, I did not manage to rediscover the "Echinoderm Quarry", but I did on the other hand have the chance to work on some new, very fossiliferous sites. Along with extensive fieldwork, I also got the privilege of analysing the MK Thoracosaurine jaw fossil, and meeting the Director and the Fossil Guide of the GeoCenter Møns Klint. I'll give detailed and illustrated accounts of all that happened* during this successful field session in the next few days... Stay tuned *Except, of course, for my studies of the MK Thoracosaurine - that'll have to wait until after the paper has been published (IF it does end up being published)
  11. The Amateur Paleontologist

    Isselicrinus buchii

    Isselicrinus buchii is a relatively common crinoid in Maastrichtian Danish chalk strata in the form of small 2-3 segment-long columnal fragments. However, starting from 10 segments, an articulated I. buchii columnal is fairly rare, and above 30 segments is substantially rare. On this specimen, there are in total 40 segments and 1 partial segment. It was recovered from a large chalk nodule, which had to be broken several times to access the whole stem. The fossil has been entirely 3D prepared, by the use of small dental tools. It is thought that the black colour at the base of the columnal represents a remnant of the attachment disc/holdfast
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