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Found 5 results

  1. While visiting family in Georgia, I decided to take my older brother on a Cambrian Bug Hunt. There is no better place to go than a little exposure in Murray County, Georgia that lies under a bridge and next to the beautiful Conasauga River. The Upper Cambrian (Aphelaspis Zone) trilobites found here include Aphelaspis brachyphasis, and Agnostoids, among others. This is a relatively small exposure and depending on the height of the river, it can make the exposure that much smaller or not accessible at all. I was down her in May on my way back from Sanibel Island and I was not able to collect due to river conditions. The other thing that is small with this site is parking, if cars are parked correctly, you can fit 2, but no more that that. I also collect early and leave as much room as possible for any other collectors. Here are a couple pictures of the collecting area and the steep and often slippery descent. We were were only able to stay for two hours due to the fact that my brother got injured, but I will touch on that at the end. Here are some of my finds, I also collected matrix to work on later. Aphlelaspis brachyphasis Aphelaspis brachyphasis and a Agnostoid portion. Besides the mudstone, trilobites are also found in a harder grey shale. Here is a very large portion I found on the ground ( 35 pounds) and I will work on this piece at home. As you can see, there are trilobites found in it and many times they have excellent preservation. One handy tool to have there is this folding hacksaw, it allows me to trim pieces in the field for easier storage. As I stated above, my brother had an accident, really a slip and fall. Besides watching how you go up and down to your car, you have to watch the loose matrix. He went to adjust how he was sitting and the loose matrix caused him to slip. It appears he broke or dislocated his left pinky finger and we left so he could go to Urgent Care. Be careful collecting anywhere.
  2. Olenus gibbosus trilobite 1.jpg

    From the album MY FOSSIL Collection - Dpaul7

    Olenus gibbosus Trilobite Outwood Shale of England Upper Cambrian ( 497 to 485.4 million years ago) The fossil trilobite measures 3/4" long and is on a matrix measuring 1 1/4" by 1 1/2". Olenus is a genus of Upper Cambrian ptychopariid trilobite. Olenus can be found in the British Isles, India, Norway, Sweden, Denmark, Newfoundland, Texas, South Korea, and Australia. Fossils of Olenus are commonly found in dark mudstones, which were deposited on the seafloor in environments with low oxygen levels. The very wide side lobes (or pleurae) are thought to have shielded extended gills, which would have helped the animal absorb the maximum amount of oxygen possible in such an environment. Evidence also suggests that Olenus and its relatives may have developed a symbiotic relationship with sulfate-reducing bacteria, either by feeding on them or by absorbing nutrients directly from them. Kingdom: Animalia Phylum: Arthropoda Class: †Trilobita Order: †Ptychopariida Family: †Olenidae Genus: †Olenus Species: †gibbosus
  3. Chlorophyte or Chloud Faces?

    Hello, all. After my last wonderfully successful Id effort on here, i thought I'd try again. This specimen was boshed free of some matrix that was sent to me by the unrivalled Ralph @Nimravisin a batch of matrix from the Conasauga Formation, Upper Cambrian, Georgia, USA and home to a multitude of the trilobite Aphelaspis brachyphasis as well as rarer agnostids and other even rarer trilos. I was looking at this paper https://www.researchgate.net/publication/250083071_Exceptional_fossil_preservation_in_the_Conasauga_Formation_Cambrian_Northwestern_Georgia_USA and thought my specimen below looks rather like the example D in Figure 3 (sorry, I don't know how to just post that image. It's a chlorophyte, so is mine ? They appear to be sort of tiny strings of sausages, the longest string being about 2 mm long, so each individual 'cell' is very tiny indeed. Thank you for any comments, ideas or suggestions. Adam.
  4. Georgia Trilobites

    I did not think that I was going to have time to hunt Georgia Cambrian trilobites – Aphelaspis brachyphasis from the Conasauga Formation, but I did find a couple hours to collect. So this morning I left at 7 AM and drove one and a half hours to Murray County, Georgia to collect at a small exposure on the Consssuga River. It was a cold morning, 31°, even by my Chicago standards for October. The purpose for this visit visit was to gather some matrix for winter work. If you have a chance to visit this site, besides being abundant , many of your finds will have multiple trilobites on the mudstone. Below are a couple pics of the area, as well as some of the trilobites that I found.
  5. The McKay Group Trilobite Locality of Southeastern British Columbia. Tucked away in the Southeastern corner of British Columbia not far from the historic town of Fort Steele, outcrops a highly fossiliferous exposure of the McKay Group. The site often referred to as the Tanglefoot Creek Trilobite Locality, for its location on an unnamed tributary of Tanglefoot Creek, is a very special place. Below are two photographs of the site. Along the upper reaches of this creek lay the scattered remains of hundreds of oddly preserved trilobites from the Upper Cambrian (Upper Steptoean, 494.5-493 Ma). Odd is a perfect description for the mode of preservation of the Tanglefoot Creek trilobites, for each perfect trilobite is faithfully reproduced by vertical encrustations of parallel to sub-parallel crystals of calcite that have grown from the dorsal and ventral surfaces of the trilobite. These calcitic growths form neat little wafers that weather from the marly limestones exposed at the site. Occasionally these calcite wafers grow together forming sheet-like structures. Although this mode of preservation is strange it is reminiscent of that of the Middle Cambrian trilobites found in the Wheeler Formation of Utah, however those trilobites do not occur on wafers. Typical calcite wafers. Several wafers that have grown together. Wujiajiania sutherlandi. Complete trilobites are a rarity at most Cambrian sites but at the Tanglefoot Creek site the vast majority of specimens are either fully complete (i.e. carcasses) or missing their free cheeks (i.e. moults). Partial specimens do occur but the large numbers of complete specimens overshadow these. Large wafer with Labiostria westropi. The trilobite fauna at Tanglefoot Creek shows a fair amount of diversity. There are ten genera with 11 species commonly found at the site. By far the most common species encountered are Wujiajiania sutherlandi and Labiostria westropi. Wujiajiania sutherlandi Labiostria westropi The next most commonly encountered species are Pterocephalia norfordi, Irvingella major and Pseudagnostus communis. Pterocephalia norfordi Two specimens of Irvingella major Pseudagnostus communis The remaining species (Hedinaspis canadensis, Elvinia roemeri, Irvingella new species, Agnostotes clavata, Aciculolenus palmeri and Burnetiella leechi) are less frequently encountered. Hedinaspis canadensis Elvinia roemeri Agnostotes clavata Aciculolenus palmeri Burnetiella leechi Additionally there are very rare specimens of Homagnostus sp. and Cliffia c.f. lataegenae . As these species are rarely encountered, I do not have photos of either specimen. Since the publication of the site's location by researchers at the University of Alberta (B.D.E. Chatterton) and Denman Island (R. Ludvigsen) in 1998 the area has been staked as a mineral lease. As such collecting is no longer allowed at the site but numerous other localities nearby have been found outside the lease area. These new sites rival the original Tanglefoot Creek locality in terms of trilobite diversity. Current research on these new sites and their associated trilobite faunas is being undertaken at the University of Alberta and a paper is forthcoming. For further information on this remarkable locality and its trilobite fauna see the sources below. Brian D.E. Chatterton and Rolf Ludvigsen. 1998. Upper Steptoean (Upper Cambrian) Trilobites from the McKay Group of Southeastern British Columbia, Canada. Memoir 49, The Palaeontological Society, 43 pages. Carlo Kier's collection of Tanglefoot Creek Trilobites including photos of some of the new species currently being investigated. Chris Jenkins' collection of Tanglefoot creek trilobites mainly from the new sites. This material is a copy of a guest post I did on Dave Hayward's (Shamalama) Views of the Mahantango blog back in July 2010.
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