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Found 8 results

  1. Andúril Flame of the West

    Exploring the Potomac Group

    A short while ago I unintentionally stumbled across a poorly preserved carbonized plant fossil at one of my favorite fishing streams - a place that I had never imagined would hold fossils. I posted an image of the specimen in the Fossil ID section where several members of the forum kindly confirmed my suspicions that it was a plant fossil. Here is the link to the original post in Fossil ID: @patelinho7 and I have been jointly looking into the Culpeper Basin (a Triassic rift basin within the Newark Supergroup) and its potential fossil content, and it seemed to the both of us that this could potentially be Culpeper Basin material. There were some red sandstones present that seemed to have originated from the Manassas Sandstone (a formation - or member? - within the Culpeper Basin) and the map that I inserted into the original post indicated that Bull Run Formation/Manassas Sandstone was exposed in the area where the specimen was found. However, further exploration of the site has led me to believe that the fossil originated not from the Culpeper Basin, but from Potomac Group (Early Cretaceous oxbow swamp deposits in Maryland and northern Virginia) sediments. From what I know, this could be very intriguing since the locality is in an area quite far from the traditional Potomac Group outcrop belt. However, I hope that this post and interpretations from more versed members of the forum will help establish whether these are indeed Potomac Group fossils. As a small forewarning, this will be a rather picture-heavy post. Aside from including a plethora of specimen images, I have also included images of rocks found at the stream locality in case they may help to interpret the site. Based on what I have gathered from the site thus far, my current working hypothesis is that I have found an area where a formation within the Potomac Group (hopefully someone more experienced with these fossils could shed light on whether they originate from the Patuxent Formation, Patapsco Formation, or Arundel Clay) overlies strata from the Culpeper Basin. However, this hypothesis is based solely on my observations and my limited stratigraphic knowledge and any revisions are very welcome. Before diving into the report itself, I want to thank everyone that has helped me thus far and that comments on this post. Your help and comments have greatly helped me on my quest and I would still be very clueless if it were not for this forum! To begin, I have included images of a few loose clasts that I believe may originate from the Culpeper Basin (from the Manassas Sandstone, specifically). The first specimen that I would like to mention is a piece of red, fissile shaly mudstone. The fissile nature of this specimen interested me most since most rocks I have encountered have been massive, often without clear bedding planes visible. Due to the locality being in close to the Manassas Sandstone according to the map in Dr. Weems's article (see map in the original Fossil ID post) I automatically assumed that it was one of the red sandstones from that formation. However, I have next to no experience with Potomac Group sediments and cannot say whether this may belong to the Potomac Group. Above are images of two more stones that are pretty good representatives of the general rock type found at this locality. The bottom one is another fissile mudstone much like that shown in the first image. The top specimen is a relatively flat slab of stone that seems to represent some sort of bedding plane. Loose flat slabs that resemble bedding planes are relatively common at this locality. Now, for a very shocking find! In my explorations I came across a very rare specimen of a fossilized Shoppingia cartdumpites. Unfortunately this specimen was what might be called a leaverite as it was far too large to take home and was located in relatively deep water . On a more serious note, I came across a specimen of very fissile red sandstone/siltstone. The thin layers of stone easily came apart, revealing very dark red stone within the specimen. The presence of this specimen seemed also to indicate that the Manassas Sandstone could be present at this particular locality. Now, for something a bit intriguing that could potentially represent a fossil. Unfortunately the lighting was not very good at this time of day, but there was an interesting inclusion in this piece of stone. Now, for a few more photographs before the fossils. They are a bit difficult to see due to the glare on the water, but these may be the source beds from which many of the flat bedding planes and perhaps where the fossils are coming from. I plan to add to this trip report as I continue to explore since there were a number of intriguing features that I did not photograph on my last outing. Here are a few additional things that could be important to note: 1.) When some of the rocks shown in the above photographs were flipped over, they bore a very dark red coloration. This reminded me of the oxidation that is present on some ironstones found in the Arundel Clay. 2.) Farther downstream there was a thick clay layer on the bank. This clay layer, which was composed of a whitish grey clay, was positioned between a layer of strata that coated the stream bottom and Pleistocene/modern soils. Now that I have posted some intriguing geological features, here are some photographs of the fossils that I decided to collect. Specimen 1: This is the original specimen that I posted in the Fossil ID section. Other members confirmed that it is a piece of poorly preserved wood. Specimen 2: More poorly preserved plant material. It is very hard to tell from the first photograph, so I have outlined the approximate shape of the plant fossil in the second photograph. The third photograph shows some carbonized material on the edge of the specimen. Specimen 3: An example of a stone containing a few carbonized plant elements. Stones with a few scattered plant elements are relatively common, though from my current explorations they seem to occur in rather localized areas. Specimen 4: Another indeterminate carbonized plant fossil. It is a bit larger than most of the specimens that I have found and the shape is rather different from that of most of the plants. Specimen 5: Three views of the fifth specimen: front (top image), bottom (middle image), side (last image). Specimen 6: This specimen probably represents one of the best preserved plants that I have found. However, I am not sure whether the specimen in the top image is preserved well enough to be identifiable. On the other side of the specimen a compressed plant specimen is preserved. It is difficult to tell from the photographs, but the fossil cuts diagonally across the bottom of the specimen on the lower image. Specimen 7: This plant hash plate is one of my favorite specimens of those that I recovered. Again, not sure if any members would be able to tell what these specimens may be. Specimen 8: I am entirely unsure what this specimen may be. I do not know whether these are fossils, impressions, mineral deposits, or some sort of sedimentary impressions. At any rate, the colors and depressions made for an intriguing rock. Specimen 9: A very large slab with some of the best preserved plant remains that I have recovered at this point. On one side of the slab (the first few photographs) an articulated plant seems to be preserved. This one is pretty intriguing... would any plant or Potomac Group experts have any ideas on what it may be? The other side of the slab (the last photograph) seems to contain what might be a poorly preserved plant.
  2. Found this along a section of beach in Nova Scotia. It is oval in cross section and is cracked like this all the way around. Thoughts? IMG_6844.mov
  3. I recently published a paper describing how biological cells and soft tissues preserve in ancient vertebrate fossils, combining the two major hypotheses by Dr. Mary Schweitzer and Dr. Jasmina Wiemann. Apparently, a biology professor at the University of Akron made a video on it, and it explains the paper rather nicely for the layman. His comments on it start at the 14:50 mark, before that he deals with some inaccurate claims made about soft tissue preservation by others: https://youtu.be/ViCJtaePtzY
  4. Isotelus2883

    Some More Penn-Dixie Stuff

    Some more unidentified stuff. A Rhynchonellid? Not very confident with my brach IDs. Pedicle valve. Brachial valve. Cardinal view Front view. Two specimens of something. Wood, maybe?
  5. Nreekay

    Petrified Wood - Carbonized?

    Hey Folks, We found this hunk this afternoon. Any idea why the piece of wood here in black is carbonized? It comes off when you rub it. Other pieces we found today are definitely fossilized, but this one is different. Any ideas? E & B
  6. Bonehunter

    Shale nodule teeth or chelicerae?

    Hi all! I have been using my new scope and camera to get some better photographs of conodonts I've recently found in nodules in Pennsylvanian Stark shale between Winterset and Bethany Falls limestone. I have found 4 of these 500-700micron, tooth-like structures-I destroyed several inadvertently removing the "carbonized film". Two of the 3 most recent are not connected to anything, but have a broad base. In the 3rd photo, you can see what appears to be a joint where the "tooth" connects. I am waiting on finer needles to clean this one. Though I call them "teeth", I don't really think they are-they are not conodonts that I can tell, and in a couple nodules, there are other "carbonized" pieces present (you can see portions in photo two). I think these are really cool!!! If anyone has even a thought about what they could be, I'd appreciate it, as always!! Bone
  7. Hello everyone! I recently received this cool fossil from the Devonian in Scotland, it is a Palaeospondylus gunni: I have seen fossils of this enigmatic organism prepared in really wonderful ways to expose more of the animal and I was wondering: would this be possible to do here? I am not exactly sure of the process used on the others, possibly just really fine air abrasion? The fossil seems to be rather thin against the rock but it isn't completely flat, here are some pictures I took under the digital microscope, hopefully they might show it a bit better. Any help would be greatly appreciated, I am happy to provide more pictures if necessary. Thank you for your time!
  8. autismoford

    Discosauriscus austriacus

    Classification Kingdom: Animalia Phylum: Chordata Order: Seymouriamorpha Family: Discosauriscidae Genus: discosauriscus Species: discosauriscus austriacus
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