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Found 518 results

  1. Bought a collection and this is one of the handful of items without a label. It is a partial trilobite from NY. Cephlon and thorax. No other details. Had a really hard time getting the camera to focus properly on it. Thank you.
  2. I'm heading across the ditch for a holiday in April and was hoping to spend a couple of days checking out some fossil sites. Anyone got any suggestions? Would love to find some ammonites and trilobites, also any bone fragments.
  3. Could use some help identifying this trilobite.
  4. I have been staring at this thing for a while and looking at all of my Paleozoic vertebrate books, but I am officially stumped. It has the color and texture of the typical holocephalan/chondricthyan teeth that I find here, but the morphology is just not matching anything I have seen before. It is possible that it could be a part of a trilobite or some other invert, but I am not very well versed on my invertebrates. Further, the invertebrates are very rarely this color here. Bangor Limestone Mississippian (Late Carboniferous) East TN Size of about 0.75cm @JimB88 @Archie
  5. I bought this Trilobite from Morocco about 11 years ago. I know there are many fakes out there, so I am asking for your opinions. There is a repaired crack through the center of the matrix which made me believe that it was real. You can see the crack in the photo, it goes from the upper left, through the trilobite, and over to center right. If it is real, is the black color natural to this type of trilobite from Morocco or has it been painted?
  6. Found on Lake Superior near Ashland, WI. Trilobite fragment?
  7. Hi Everyone, Somewhat new to fossil collecting. I picked this up for 20$ at a flea market, sold to me by a very old man who didn't know anything about it. Is it real? Any help appreciated.
  8. Hi, I came across this site last week and though it might be a good place to help me identify my latest find. While excavating for an addition on my house, I found these two fossils at about the same time in the same location. The one on the right is a trilobite, however the one on the left is the fossil I’m having trouble identifying. My property is located in southwest Michigan, in an area known for glacial deposits, so it makes it a bit challenging to determine what period the fossil is from since it may have traveled many miles before it was deposited. I have found many fossils on the property (almost every time I dig), but this one has me somewhat stumped. I’m pretty sure the substrate is marshall sandstone. In one of the photos looking at the center axis, it appears to have been agateized. Thanks for your help.
  9. Up to date information about access to the Kinzer formation near Lancaster Pa, please. Expect to be in the area this weekend. Thanks, Gordon
  10. Here is one that has me perplexed. I am always on the lookout for strange and new trilobites, especially from North Africa. I picked this one up in Tucson. At first I thought it may be just a fake, but it was from a trusted friend. After inspecting it under magnification, it is the real deal. It is nearly 4 inches long. It is Devonian in age from Morocco, and I can not find mention of anything in the literature and wondered if anyone out there might have an idea.
  11. Hello, I am actualy working on a 3 D reconstruction of the Trilobite Triarthrus The body and my references as a blueprint :
  12. Hi, I'm wondering if anybody can provide any insight about this fossil I'm attempting to prep. It's from an abandoned quarry in northern Illinois where I've found lots of Silurian Calymenes, but I'm not sure what this is. I'm paranoid to continue prepping without knowing more.. any ideas?
  13. Hi all, My sister recently traveled to Morocco and bought a trilobite for me. Can someone please help me identify the authenticity of this fossil? Also, what types of trilobite is this anyway? Thanks so much! Ken
  14. So, I had a Greenops boothi that was missing the the glabella and the entire left portions of the cephalon. @ischua and I dug this fella up at Penn Dixie in the fall. I decided to finally have a go at him to see how much could be salvaged. Here's the before: A little more work: A little more: And, finally: For size:
  15. This great question from Auspex a couple years ago can now be answered in the affirmative. Up until now there have been a few close calls but nothing conclusive. The earliest reference to alleged trilobite eggs was made by Joachim Barrande in 1872. C.D. Walcott also published a brief paper in 1877 and each of these were subsequently disproved by Percy Raymond in 1931. Zhang and Pratt 1994 also reported on possible eodiscid embryos but had to concede that they may have been produced by another soft-bodied arthropod. Now at long last we finally have what appear to be bona fide trilobite eggs. Not surprisingly, the remarkable preservation of pyritized Triarthrus specimens from New York have yielded this highly anticipated fossil gold. Pun intended, Enjoy! PYRITIZED IN SITU TRILOBITE EGGS FROM THE ORDOVICIAN OF NEW YORK (LORRAINE GROUPE): IMPLICATIONS FOR TRILOBITE REPRODUCTIVE BIOLOGY Hegna, Thomas, Martin, Markus, Soriano, Carmen (2015) Geological Society of America - North-Central Section - 49th Annual Meeting (May 19-20) Paper No. 20-3 - Presentation Time: 8:45 AM Despite a plethora of exceptionally preserved trilobites, trilobite reproduction has remained a mystery. No trilobite has preserved unambiguous eggs or genitalia. This study reports on the first occurrence of preserved, in situ trilobite eggs from Triarthrus eatoni from the Lorraine Group in upstate New York. Like other exceptionally preserved trilobites from the Lorraine Group, the trilobites are replaced with pyrite on their exoskeletons and ventral appendages. The eggs (presumably representing unfertilized eggs) are spherical to elliptical in shape, about 50 µm in size, and are clustered in the genal area of the cephalon near the lateral border. The eggs are only visible ventrally with no dorsal brood pouch or recognized sexual dimorphism. This location is consistent with how modern horseshoe crabs carry their unfertilized eggs. Trilobites likely released their gametes (eggs and sperm) through a genitalia pore of as-yet unknown location (likely near the posterior boundary of the head). If T. eatoni’s reproductive biology is representative of other trilobites, they spawned rather than mated and exhibited r-strategy reproduction. A more detailed view of the anatomy associated with the eggs in currently in progress with synchrotron x-ray tomography. Barrande, Joachim (1872) Systême Silurien du centre de la Bohême. 1 ère Partie. Recherches paléontologiques, Supplement au Vol.I: Trilobites, Crustaces divers et Poissons, (Prague and Paris) Walcott, C.D. (1877) Note on the Eggs of the Trilobite. Annual Report of the New York State Museum of Natural History, 31:66-67 Raymond, P.E. (1931) Capsule-shaped "Eggs" In: Notes on invertebrate fossils, with descriptions of new species. Bulletin of the Museum of Comparative Zoology, 55:165-213 Zhang, X.G., & Pratt, B.R. (1994) Middle Cambrian arthropod embryos with blastomeres. Science, 266:637-639
  16. Drove up to NY for my first trip hunting. Thanks to Dave (darctooth), I managed to get to the Sangerfield roadcut without any problems for what eventually turned out to be a very pleasant day. Things were a bit rough starting out as the fog was heavy early heading out from PA and a balmy 35 degrees Three hours later it was sunny and breaking into the mid-40's as I pulled up to the days target location I took about half a dozen steps when I spotted my 1st trilo head staring up from the loose shale before I even made it up the hill From that point on I kept up a steady pick of pieces and parts throughout the day, unfortunately I couldn't manage to find any that were whole. I also managed to find some other interesting pieces. Nothing particularly special, but considering I had only ever found a single trilo head on a previous trip it was a good day for me. If nothing else it gave me a bunch of pieces to practice prep on for the day when I finally get a complete specimen
  17. During the Christmas holidays, i had the opportunity to go out again for a trilobites hunt. Could spend 2 days there splitting shale. The site is Ordovician. The plan is to split good looking shale blocks, the bigger the better. For site pictures, you can go check on my previous report here I manage to find nearly complete or nearly complete bugs. The first morning, complete ones took their time to show up. The first one was this one : Neseuretus tristani, the most common on the site, but still a cool piece. On it's own it would have make my day. I will post more in a few days
  18. Hey guys this is my koneprussia that has spines on spines!
  19. I bought this fossil today at the Houston Museum of Natural Science. I want to know the genus of trilobite and maybe the species. It looks like Phacops. It is in a defensive pose. In total from the glabella to the pygidium is 6 1/2 centimeters. Any help would be appreciated!!! Glabella Side view
  20. Diatoms are monocellular organisms which contain chlorophyll, and manufacture their own food in the same manner as plants, through the process of photosynthesis. They are one of the major producers of the Earth's oxygen. Their long geological history makes them very useful in the correlation of sedimentary rocks, and they are of equal value in reconstructing paleoenvironments. They are remarkably common everywhere there is any water at all! I have studied fossil marine diatoms for many years, as they are my primary interest in the microfossil world. Many of them are quite beautiful, and they are a favorite subject with many persons who enjoy photomicrography. My primary interest is in diatom taxonomy and evolution, not photography, so I'm afraid my images don't really do them justice. Centric diatoms exhibit radial symmetry, from circular to triangular, and all points between. Oval shapes are not uncommon. The oldest specimens of essentially modern diatom types are from the Cretaceous, and one of the very best localities is the Moreno Shale, which crops out in the Panoche Hills of California. Many diatomists have worked on this flora, and it is fairly well understood. Here we see two of the common taxa from this source. (The bar across the top of the Azpeitiopsis is a sponge spicule, not part of the diatom!) Diatom frustules are composed of secreted silica -- hence they are brittle, but can be virtually indestructible by chemical or diagenetic change in the right sort of environment. (One exception is a highly alkaline environment, which corrodes and ultimately dissolves biogenetic silica.) Other siliceous microfossils include some types of sponge spicules, silicoflagellates (another blog entry coming up perhaps), radiolarians, and ebrideans. At least one family of the foraminifera uses siliceous cement to form their tests. Diatom floras changed radically across the KT boundary, but they are still abundant in the Paleocene. Arguably the world's most famous locality for fossil diatoms is the region around Oamaru, New Zealand, and all collectors have many specimens from there. The age is Late Eocene - Early Oligocene. Somewhat earlier are the many great localities in Russia. Here is a Paleocene specimen from Simbirsk, Ulyanovskaya, Russia. Note that it deviates from pure centric form in that it is slightly ovoid. My own specialty is the diatoms of the Miocene. The United States is blessed with superb Miocene localities on both coasts, many well-known to members of this forum, because most of them can also produce superb shark teeth. The earliest known Miocene flora in the US comes from sites in Maryland: near Dunkirk, Nottingham, and other lesser known localities along the Patuxent River. All of these sites began to be explored in the mid-19th Century, because the diatoms are so perfectly preserved, to say nothing of abundant! These sites are in the lowest part of the Calvert Formation; indeed, there is an unconformity above them that lasted for a considerable period of time, and the diatom flora exhibits considerable changes across it. This part of the Miocene section belongs to the Burdigalian Stage, and age-equivalent diatoms are found also in bore holes and artesian wells at Atlantic City, New Jersey. An index fossil for the East Coast Burdigalian is the following taxon: This species of Actinoptychus evolved relatively quickly, and became extinct at the end of the Burdigalian. It is remarkably beautiful under the microscope, especially in color images, as fine structures in the silica serve as diffraction gratings. I regret that I have no color image in my photo library: I need to make a few! The Calvert Cliffs are rich in fossil diatoms, also, from the later, Middle Miocene. The above is but one example of the many marvelous specimens that can be found in the Calvert. If you're walking the beach for shark teeth, and have access to a microscope such as that used in microbiology or pathology labs, or even the type used in high school biology labs, grab a sample of the sediment. Soak it in water until it disaggregates into mud, let it settle until the water is just a bit cloudy, and put a drop on a microscope slide with a coverslip. A magnification of 100X should reveal diatom frustules (or fragments thereof) among the remaining, unsettled particles of silt. Diatomists all have their own protocols to get such specimens almost perfectly clean, and permanent slides made with a mountant of high refractive index can be utterly gorgeous. I am currently working most intensely on samples from the somewhat later Choptank Formation, that outcrops at Richmond, Virginia. This is another locality that produces excellent specimens: This is one of the most enduring taxa in the geological record, appearing from the early Paleogene right up until the present day, and it can be very abundant. A common triangular form. There are many genera of triangular centric diatoms. And other radial shapes are possible, too: So far as I am aware, this unique specimen is the earliest known example of this taxon, which is still found today in tropical waters. The breakage in the top "arm" is unfortunate, but what can I say: the specimen is, thus far, unique. One might expect modern contamination of the sample, were it not for the fact that the Richmond localities occur far from the contemporary ocean coast -- they are not "watered" by modern waves! That's it -- the 3.95 MB limit..............................
  21. I just checked the weather forecast for next weekend. It looks promising. Right now all of our snow is melted, with no snow in the near future. The week is supposed to warm up to the mid 40's with saturday reaching a high of 49. I am planning on doing a Central New York Devonian Adventure! Sangerfield in the morning and Deep Springs in the afternoon. Are there any brave souls who would like to tag along? Dave
  22. Fossils reveal unseen 'footprint' maker, University of Aldelaide January 17, 2017 by Robyn Mills http://www.adelaide.edu.au/news/news90102.html https://phys.org/news/2017-01-fossils-reveal-unseen-footprint-maker.html The paper is: Gutiérrez-Marco, J. C., D. C. García-Bellido, I. Rábano, and A. A. Sá, 2016, Digestive and appendicular soft-parts, with behavioural implications, in a large Ordovician trilobite from the Fezouata Lagerstätte, Morocco. Scientific Reports 7, Article number: 39728 (2017) doi:10.1038/srep39728 http://www.nature.com/articles/srep39728 Yours, Paul H.
  23. Hello! I live in Las Vegas and I love fossil hunting in Frenchman Mountain, the there are trilobites everywhere, I finaly found a full body trilobite there, can you guys I.D this one for me? I am pretty sure they are Olenellus nevadensis, because they are common in Nevada (who would have guessed that?) but I am far from an expert.
  24. From the album La Dominelais - winter 2016/2017 - Ordovician

    Ectilaenus giganteus : a trilobite found in La Dominelais (south of Rennes - Bretagne - France during winter 2016/2017 Ordovician, Landeilian (-460 MA)
  25. From the album La Dominelais - winter 2016/2017 - Ordovician

    Neseuretus tristani and counterpart : a trilobite found in La Dominelais (south of Rennes - Bretagne - France during winter 2016/2017 Ordovician, Landeilian (-460 MA)