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Showing results for tags 'conasauga formation'.
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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.
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- achlysopsis
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I was wondering if anyone had a good list on different species found in the Conasauga Formation? I've found a few references to trilobites, but I was especially curious about non-trilobite species such as brachiopods, sponges, non-trilobite arhtropods, etc.
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May be a bit of an odd question, but I was wondering what horizons or layers are the most fossiliferous in the Conasauga Formation. I've heard about the Tibbs Bridge site (RIP), but that site exposed a calcareous, light-colored shale from the upper part of the Conasauga. From what I read online it seems that most of the trilobite beds are located in the upper shale layers of the formation, but I was wondering if anyone else knew if the other parts of the formation had anything?
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A couple of my "Cheap" Purchases from the 2019 MAPS Show
Nimravis posted a topic in General Fossil Discussion
The last thing that I needed was anymore fossils, but every once in a while I will by things for me or for other Fossil Forum members that I think would enjoy a certain piece(s). I did buy several things for one member and a couple for another member, but I will not post those, I am going to post a couple things that I got for myself, and these were very cheap and stuff that I really liked, her are a few examples. First up is a beautiful Mazon Creek Pecopteris piece. It is rare for me to buy anything from Mazon Creek since I collect it and have a lot, but this was a very pretty piece, at least to me, and at $25.00 I took it. The next items I picked up at the Hotel Show and they were from an older collector who sent several beer flats of fossils with a friend to sell since he was moving and could not take the stuff with him. When I opened this beer flat, I saw 2 Miocene Ecphora shells along with other items (all identified as coming from the Yorktown and Pungo River Formation, Aurora, NC) and since it was priced at $5.00, I could not pass it up. Besides the Ecphora, look at what other items were contained in the flat. More in next post.
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Georgia Conasauga Formation- More Than Just Trilobites
Nimravis posted a topic in General Fossil Discussion
At this Murray County location, trilobites are not the only thing that can be found. Last April, I contacted Dr. David Schwimmer, who is a Professor of Geology at Columbus State University in Georgia. Dr. Schwimmer has also published a couple papers on the fossils from the Conasauga Formation. I wanted to see if he could identify a small piece of matrix that contained something that I have not found before, or since. I was thinking that it was some type of algae, so I sent both halves of the fossil down to him so he could examine them and see if he could come up with an ID. Here are the two halves- A couple months later, I was contacted by Dr. Schwimmer and he provided the below response. "We put your anomalous specimen in the SEM (Scanning Electron Microscope) finally, and it turns out there was no image! That means it has no relief, its a color feature, almost certainly iron oxide colors. My interpretation is that it must be some sort of relict carbon-based plant material, which would suggest, as you first assumed, some sort of algae. Since there is no tissue I would rule out red algae, which usually have carbonate crusts, leaving a green alga as the likely source". I let him keep whatever piece that he wanted and he returned the other piece. Here are close ups of the piece that I have in my collection.
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