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Found 22 results

  1. Middle Cambrian Stromatolites?

    Hi Everyone, I've recently returned from a weekend trip to a fossil site in central Australia. The location contains siltstone laid from the ancient ocean once in the middle of Australia during the middle Cambrian. Both John R. Laurie and Dr P.D. Kruse have completed work on the site and have some publications accessible online. Along with a good collection of trilobites I came across a number of what I believe to be stromatolite fossils. The first image (1.1) was found on the way to the location about 150km before we reached it, the road cut through a much lighter shade of rock outcropping than we had previously seen. The formation appeared identical to the Arthur Creek formation, and judging from the geological surveys I have checked it should be part of the same formation. So keep in mind the first image is not from a known fossil bed, but is only from my best judgement part of the same formation. The remaining fossils in 1.2 are all from the known fossil bed, part of the Arthur Creek formation dating to the Templetonia (middle Cambrian). Top-left looks to me like a very typical stromatolite, similar to what is still seen today in Western Australia. The other fossils seem to me to be either the same stomatolite but seen at a different stage of weathering, or another type of stromatolite. I am interested to hear the opinions of those more knowledgeable! Thanks in advance. Trip Post: The fossil site is found in the location below https://www.google.com/maps/place/21%C2%B042'53.0%22S+135%C2%B039'38.9%22E/@-21.71473,135.66081,1873m/data=!3m1!1e3!4m5!3m4!1s0x0:0x0!8m2!3d-21.71473!4d135.66081 In the publication below, NTGS Elk 3 bore samples refer to the location visited. Stromatolite and bioturbated sea floor 1.1 Stromatolites 1.2
  2. From the album Central Australia - Arthur Creek Formation

    Stromatolites from the Arthur Creek formation in central Australia.
  3. Trilobite - Arthur Creek Formation 1.2

    From the album Central Australia - Arthur Creek Formation

    Trilobite from the Arthur Creek formation in central Australia. Xystridura altera (sp?)
  4. Trilobite - Arthur Creek Formation 1.3

    From the album Central Australia - Arthur Creek Formation

    Trilobite tail from the Arthur Creek formation in central Australia. Xystridura altera (sp?)
  5. Trilobite - Arthur Creek Formation 1.4

    From the album Central Australia - Arthur Creek Formation

    Trilobite from the Arthur Creek formation in central Australia. Xystridura altera (sp?)
  6. Trilobite - Arthur Creek Formation 1.8

    From the album Central Australia - Arthur Creek Formation

    Two over-lapping trilobites from the Arthur Creek formation in central Australia.
  7. Trilobite - Arthur Creek Formation 1.6

    From the album Central Australia - Arthur Creek Formation

    Trilobite under-side impression from the Arthur Creek formation in central Australia.
  8. Trilobite - Arthur Creek Formation 1.7

    From the album Central Australia - Arthur Creek Formation

    Trilobite from the Arthur Creek formation in central Australia.
  9. From the album Central Australia - Arthur Creek Formation

    Stromatolites and bioturbated sea floor from the Arthur Creek formation in central Australia.
  10. Trilobite - Arthur Creek Formation 1.5

    From the album Central Australia - Arthur Creek Formation

    Trilobite tail from the Arthur Creek formation in central Australia.
  11. Trilobite - Arthur Creek Formation 1.1

    From the album Central Australia - Arthur Creek Formation

    Trilobite from the Arthur Creek formation in central Australia.
  12. I have just returned from my first visit to a new fossil locality in the Northern Territory, central Australia. The location is around 400km north-east of Alice Springs along some rough dirt roads and once reached, runs for about 10km along the side of the road. When visiting the location today one finds themselves in the very center of Australia and a landscape of flat desert and scrub land, about as far from the sea as possible. In the middle Cambrian the site was very different and home to a vast shallow sea filled with ancient life. Arriving in the late afternoon we set up camp and got prepared for the morning of fossil hunting ahead. I had read about the fossil location from a small local out of print fossicking guide from the 1980's. That lead me to read some of the work done by John R. Laurie who has some papers published online detailing the formation and it's biostratigraphy. We managed to find some good examples of Xystridurid trilobites and stromatolites, all found within a red/white siltstone. There were also a smaller species of Agnostid trilobite, but we found many less of these. Below are some quick images I took of some of the finds, many more yet to properly examine. Also we have some larger slabs of siltstone which we plan to work on. Trip Image Album: The fossil site is found in the location below https://www.google.com/maps/place/21%C2%B042'53.0%22S+135%C2%B039'38.9%22E/@-21.71473,135.66081,1873m/data=!3m1!1e3!4m5!3m4!1s0x0:0x0!8m2!3d-21.71473!4d135.66081 In the publication below, NTGS Elk 3 bore samples refer to the location visited. Great trip! Very pleased with the finds and learning more about the geological history of central Australia.
  13. Carpoid or suggestive fragment?

    I noticed this thing on a plate of hyoliths I received from the Middle Cambrian Zhangxia Fm, Shandong, China. It kind of looks like a carpoid to me, but it may just be a suggestively shaped fragment of some other fossil. Any thoughts?
  14. Acrothele subsidua

    Found associated with Elrathia kingii and Itagnostus interstricta trilobites. See field trip report here:
  15. Itagnostus interstrictus

    Found during a trip out to a hill right adjacent to U-Dig Fossil Quarry. The trip report can be FOUND HERE. This is the largest I've collected. Typical sizes I've found are 3-6mm in length, 1-3mm in width.
  16. WHEELER SHALE TRILOBITES

    Well, i thought I'd show my primitive prepping skills. This is all rather unnecessary as Tony @ynothas already done this thread here and probably better and the pieces shown were kindly donated to me as well. So treat this as a repeat of what Tony does better. Hey ho. So these are the three pieces that Kind Tony sent me. 1. Notice this Elrathia kingii (1.2 cm long) has a break on the anterior margin (cause of death?) .and an upside down Itagnostus interstrictus (5.5 mm) above it and a piece of another to the right of it. 2. This Elrathia (1.8 cm long) has another ones cephalon stuck to its cephalon and some serious damage on the right side pleura. 3. This one is upside down in the matrix. (2.3 cm long) All my prepping was done balancing the specimens on my knee and using a jeweller's loupe to see and a board pin to do the actual prepping. Some water and saliva were also involved, but that was all. First I carefully cleaned as much of the matrix off the first two specimens as i could using the pin and then dug around the third piece so I could 'pop' it out of the matrix. Then I dug all around the other two specimens with the pin and popped them out of the matrix. Here is the third one popped out and with a bit of prep already completed. Sorry for the dreadful photo, but wifey and her camera phone weren't about so i started prepping and then took this photo with my computer as i was impatient to continue. When it was first popped only a tiny bit of the glabella was showing clear of matrix. Here i have popped the Itagnostus before popping the Elrathia.
  17. From the album MY FOSSIL Collection - Dpaul7

    Piochaspis sellata Trilobite SITE LOCATION: Chisolm Shale, Pioche, Nevada, USA TIME PERIOD: Middle Cambrian Period (497-521 Million Years ago) Data: Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event. Trilobites have facial sutures that run along the margin of the glabella and/or fixigena to the shoulder point where the cephalon meets the thorax. These sutures outline the cranidium, or the main, central part of the head that does not include the librigena (free cheeks). The eyes are medial along the glabella on the suture line (however, some species have no eyes). The fossils of the moults of trilobites can often be told from the fossils of the actual animals by whether the librigena are present. (The librigena, or cheek spines, detach during moulting.) In ptychopariids, short bladelike genal spines are often present on the tips of the librigena. The thorax is large and is typically made up of eight or more segments. The thorax is usually much longer than the pygidium, which is usually small. In some species the pygidium is outlined with a flat border. The Subclass Librostoma was recently erected to encompass several related orders, including Ptychopariida, Asaphida, Proetida, Harpetida, and possibly Phacopida. These are now known as the "Librostome Orders". Trilobites of the orders Proetida, Harpetida, and of the family Damesellidae were originally placed in Ptychopariida. Kingdom: Animalia Phylum: Arthropoda Class: †Trilobita Order: †Ptychopariida Family: †Ptychopariidae Genus: †Piochaspis Species: †sellata
  18. From the album MY FOSSIL Collection - Dpaul7

    Piochaspis sellata Trilobite SITE LOCATION: Chisolm Shale, Pioche, Nevada, USA TIME PERIOD: Middle Cambrian Period (497-521 Million Years ago) Data: Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian extinction event. Trilobites have facial sutures that run along the margin of the glabella and/or fixigena to the shoulder point where the cephalon meets the thorax. These sutures outline the cranidium, or the main, central part of the head that does not include the librigena (free cheeks). The eyes are medial along the glabella on the suture line (however, some species have no eyes). The fossils of the moults of trilobites can often be told from the fossils of the actual animals by whether the librigena are present. (The librigena, or cheek spines, detach during moulting.) In ptychopariids, short bladelike genal spines are often present on the tips of the librigena. The thorax is large and is typically made up of eight or more segments. The thorax is usually much longer than the pygidium, which is usually small. In some species the pygidium is outlined with a flat border. The Subclass Librostoma was recently erected to encompass several related orders, including Ptychopariida, Asaphida, Proetida, Harpetida, and possibly Phacopida. These are now known as the "Librostome Orders". Trilobites of the orders Proetida, Harpetida, and of the family Damesellidae were originally placed in Ptychopariida. Kingdom: Animalia Phylum: Arthropoda Class: †Trilobita Order: †Ptychopariida Family: †Ptychopariidae Genus: †Piochaspis Species: †sellata
  19. Ethrathia Trilobite.JPG

    From the album MY FOSSIL Collection - Dpaul7

    Elrathia Trilobite fossil Utah, USA Middle Cambrian 501,000,000-530,000,000 million years Elrathia is a genus of ptychopariid trilobite species that lived during the Middle Cambrian of Utah, and possibly British Columbia. E. kingii is one of the most common trilobite fossils in the USA locally found in extremely high concentrations within the Wheeler Formation in the U.S. state of Utah. E. kingii has been considered the most recognizable trilobite. Commercial quarries extract E. kingii in prolific numbers, with just one commercial collector estimating 1.5 million specimens extracted in a 20-year career. 1950 specimens of Elrathia are known from the Greater Phyllopod bed, where they comprise 3.7% of the community. Kingdom: Animalia Phylum: Arthropoda Class: †Trilobita Order: †Ptychopariida Family: †Alokistocaridae Genus: †Elrathia
  20. Adam's Cambrian

    A rangeomorph holdfast trace fossil from the Ediacara formation, Rawnsley quartzite of the Flinders Range, South Australia. This specimen is Medusina mawsoni, so called because it was until recently thought to be a jellyfish, but is now believed to be the attachment point of a fractal rangeomorph as Charniodiscus is the point of anchorage for Charnia sp. This one may have been the holdfast point for some species of Rangea. The diameter of the outer circle is 1.5 cm and the fossil is estimated to be 555 million years old.
  21. Agnostids

    From the album Adam's Cambrian

    Agnostid Trilobite Kingdom: Animalia Phylum: Arthropoda Class: Trilobita Order: Agnostida Family: Ptychagnostidae Genus: Ptychagnostus Species: gibbus Author Citation Linnarsson 1869 Geological Time Scale Eon: Phanerozoic Era: Paleozoic Period: Cambrian Epoch: Middle Stratigraphy St Davids Sediments Biostratigraphy Paradoxides Series Provenance Acquired by: Purchase/Trade Location Road cutting, 300 m S.W. of Cement works. Slammerstad, Oslo Norway Listed as St.David's, Paradoxides Series. About 505 million years old.
  22. I bought this fossil the other day. It is two cystoids from the middle Cambrian, apparently from Idaho. I was looking for more information as to how they caught their food, perhaps their mouth/digestive processes. I seem to find a lot more about crinoids than I do these guys. Part of my curiosity is that I've seen fossils of crinoids with rather well-preserved tube arms showing decently sized pinnules to catch floating food particles, however, the few pictures of cystoid fossils I've come across seem to show thin arms and I can't really see any pinnules preserved. It just kind of peaked my curiosity about how these guys would have caught their food and transported it to their mouths. I also can't seem to find any pictures of fossils showing the mouth structure of these creatures. I'm relatively new to fossils, so any help is appreciated. I'm sure someone is bound to know more about these things or have a fossil that shows these things in more detail. Any help is appreciated.
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