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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
- acorn worm
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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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- conasauga formation
- fossils purchases
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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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- algae
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Today I was picking through some of the matrix that I have from the Conasagua Formation from Murray County, Georgia and came across a trilobite that surprised me by its size and nice detail. Unfortunately, this trilobite is not complete, and from my limited knowledge of trilobites, it does not look like the Aphelaspis brachyphasis trilobites that i find from that location. Lastly, if it is an Aphelaspis, it must be one on steroids. Any help would be appreciated. @Kane , @sixgill pete , @Fossildude19 , @WhodamanHD , @FossilDAWG An Aphelaspis - on the larger size of what I find. Unknown:
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- cambrian
- conasauga formation
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Well I was going to add on to my post from 2 days ago, but I just decided to do a new one since it is a second visit to Murray County, Georgia to collect Cambrian trilobites from the Conasauga Formation. Today was another great days in the 80’s and it is nice to collect underneath the bridge, since you are in shade the whole time. Since my brother had to work today, I collected by myself, as I usually do. If members have not seen the area from previous posts, I will add some below that I took today. Here is a view from on top, prior heading to the collecting site. The next view is looking up at steep climb to get back to the top. Here is the collecting area. And a view of the Conasauga River, it is very low. Here are a few of my finds from today, I like to take more pics, but since I do it in the field, and cutting pieces down to size, it takes away time from collecting. Aphelaspis brachyphasis Here is a a great piece with 7 trilobites. Some of the really little ones ones are preserved very nicely. I also collected matrix to take home so I can work on it in the winter.
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- cambrian
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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.
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I was splitting up some Conasauga Formation shale from the Chatsworth area exposure @Nimravis and @MeargleSchmearglhave been posting about recently. This was material I brought back 2 or 3 years ago and have had sitting around. I found numerous specimens of the usual Aphelaspis the site is noted for. Then I split a small piece and here's what popped out: Four complete Agnostus inexpectans agnostid trilobites!! Talk about "inexpected", it's hard to find one of these complete much less four on the same piece of shale. Some other views: Don
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Finally a Complete Agnostoid trilobite from the Georgia Conasauga Formation
Nimravis posted a topic in General Fossil Discussion
The mudstone from the Conasauga Formation in Murray County, Georgia produces a nice quantity and quality of the trilobite "Aphelaspis brachyphasis" (below). But when it comes to the Agnostoid trilobites, I have only found pieces, that is until tonight. I finally found a complete specimen, though the quality is not the greatest, it is complete.
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- agnostoid trilobite
- conasauga formation
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