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Found 4 results

  1. I recently came across a new locality that exposes a calcareous section of the Red Mountain Formation. After braving poison oak, wasp attacks, swarms of gnats, and spiders, I've come out with some spectacularly preserved brachiopods, especially for this formation. I believe Dolerorthis sp.? Resserella sp. Not quite sure, looks like some kind of orthid. Leptaena sp. Another unknown orthid. A really well preserved Lingula sp. Slabs like this are fairly common, but the rock is so fragile it's difficult to get any back in one piece. The one piece in the bottom right caught my eye since it looks superficially like a Bumastus sp. fragment. Could be a brachiopod, though exposures I've found in similar rocks (also in the Red Mountain Formation) have turned up abundant trilobite remains, including Bumastus sp. Besides brachiopods, I've found a few other things. An interesting bryozoan? I'm not the best with colonial animals like this. A plate with several Hormotoma subulata(?) Hope you all enjoyed the photos! Please let me know if you think you have any IDs, I'm not too confident on some of these.
  2. Today I made a quick stop to a very small exposure of the Lower Silurian, Red Mountain Formation that is found along Dug Gap Battle Road in Dalton, Georgia. It is a nice place to stop for a few minutes. One of the nice things about this site, is the area where I park my car ,which is across the street. Here is a pic of the site- A couple closer up pics- A pic of me that my wife took from the parking area. Here are some of my finds-
  3. I had the opportunity to collect in the Red Mountain Formation recently, and considering the seeming lack of accessible sites in the area (RIP Tibb's Bridge) I thought it'd be good to show some of my finds here and say there is some stuff out there. At first I thought the site was in the Mississippian Lavender or Floyd Shales, which was my initial reason for venturing out to it as I didn't have the opportunity to collect in marine Mississippian units closer to home. I can say now with almost 100% certainty it's actually within the Red Mountain Formation, an early Silurian unit that is also a prominent ridge former in northwestern Georgia. This is based on the trilobites I found. I am more familiar with the Rose Hill Formation of central Appalachia, which bears some similarities with the Red Mountain. Not only do the two begin with "R" (and consist of two words XD), but more importantly both represent roughly similar stratigraphic sections and depositional environments. This was something I instantly noticed at this site, as some of the fossils, their mode of preservation, and the rock lithology is strikingly similar to the Rose Hill further north. Both the Red Mountain and the Rose Hill consist primarily of clastic units, particularly iron-rich sandstones and silty-shales. They are both dominated by shelly invertebrate fauna, and contain many of the same genera. There are some differences, however, namely that the Rose Hill contains a much more diverse fauna, is more abundantly fossiliferous, has many ostracodes and some tentaculitids (which the Red Mountain lacked), and contains more limestone and calcareous layers, whereas the Red Mountain appears to be mostly coarser-grained clastics. Likewise the Red Mountain Formation has more abundant crinoid remains, is a ridge-forming unit, and does not appear to have a Rochester Shale equivalent, at least from what I've seen, which is interesting. Of course these are just some quick observations I noted from a couple of outcrops, so take all of that with a heavy grain of salt. I know the Red Mountain does contain limestone and calcareous shale layers in more complete sections at Birmingham, and the exposure I went to was obviously not complete. Elsewhere the Red Mountain has produced a more varied and abundant fauna, and conversely the Rose Hill is largely devoid of fossils in many sections. Anyways, here's what everyone's been waiting for: Calymene sp. (?) I've seen a couple of threads about the Red Mountain Formation in Georgia, but none mentioned trilobites from it. According to the Georgia Department of Mines, Mining, and Geology, the Red Mountain has a a few species of trilobites. This is a plate containing a pygidium and part of the lower thorax of an individual, and a possible fragmentary glabella/cephalon. These are likely molt fragments. This was also my very first find of the day, so a great way to start it off XD. There are probably more specimens at the site, as the exposure was actually fairly large (for what I've seen in this state) and exposed a decent section of the interbedded shales and siltstones, but it was very overgrown and I couldn't reach it. This was laying on the soil. I'm going to go on a limb and say Anoplotheca hemispherica ? A plate with a couple of brachiopod shells on it. The Red Mountain's shale layers are said to be more fossiliferous than the sandstones, which is what I found to be the case at this site. Even then fossils weren't that common in even the most fossiliferous layers. A well worn plate containing abundant crinoid columnals and brachiopod fragments. I'm going to go out on a limb again and say the larger shell fragment is a Dalmanella (?) sp. , but that is a guess. A plate with a Dalmanella (??) sp. and crinoid fragments. The report I'm basing this off of is old, so a lot of these names probably no longer apply. Lots of crinoid pieces in this rock. All in all fairly successful. Any day you find a trilobite (even fragmentary) is a good day in my opinion XD For those of you interested, the site is near Summerville, near an evidently popular swimming location. The fossils actually came from several different "exposures", albeit all within close proximity to one another. If you want to visit I would highly recommend going in winter, when the plants will all be dead and the snakes/spiders down to a minimum. Thankfully I didn't come across any snakes, but I did find an alarmingly large piece of shed skin.
  4. MeargleSchmeargl

    Silurian Brachiopods from Georgia

    For reference, here's a link to my recent trip report: There have been two things I've been wondering about the trip: IDs for the brachiopods, and clarification on formation member (I know that it's Red Mountain Formation, but there's multiple members and I'm not sure which one this particular exposure is from). Anyone more knowledgeable on Silurian shells like to chime in?
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