MeargleSchmeargl Posted September 4, 2016 Share Posted September 4, 2016 So, I finally did it. Since this weekend was labor day weekend and we didn't have any other plans laid out for Saturday, I made my dream trip to Chatsworth a reality. The official time it was supposed to take to get to the site according to google maps was one and a half hours, although it felt like less time, despite GPS blunders along the way. After successfully finding the destination on Tibbs Bridge road, I wasted no time in making my steady way down the path from the bridge to the slowly flowing Consauga river, eagerly pursuing the trilobites below. I was immediately scanning the ground when I reached the bottom of the hill: To be continued... Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted September 4, 2016 Author Share Posted September 4, 2016 ...Continued It did not take me very long to find my first trilo: After some time I moved up formation to be greeted with greater success: After a good hour of hunting the site and selecting the best specimens to take home, we retreated back to the city for a refreshing Chick-Fil-A smoothie. Upon arrival, I took a closer look at my new additions to my collection. Here is a haul family photo: To be continued... Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted September 4, 2016 Author Share Posted September 4, 2016 The first Trilo in the spotlight is the biggest of the bunch, with positive and negative halves. Thumb comparison: Negative closeup: Positive closeup: The next trilo is an interesting phenomenon, with an outline around the actual trilo somewhat resembling trilos from much later. Thumb comparison: To be continued... Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
Raggedy Man Posted September 4, 2016 Share Posted September 4, 2016 ...I'm back. Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted September 4, 2016 Author Share Posted September 4, 2016 ...Continued Negative closeup: Positive closeup: The second to last trilo is one of the two which I considered FOTM worthy This is a small one, but with nice detail. Thumb comparison: Negative closeup: To be continued... Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
Darktooth Posted September 4, 2016 Share Posted September 4, 2016 Nice finds! I can't wait to see more! I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted September 4, 2016 Author Share Posted September 4, 2016 ...Continued Positive closeup: And finally, the last trilo(s) which I am considering for FOTM is one with a particular amount of detail in the thorax segments. Thumb Comparison: Closeup: And a closeup of the particularly FOTM worthy trilo: And that just about sums up my trip to chatsworth! Not entirely being the trilo expert (at all), I would appreciate any accurate IDs, especially for my very early FOTM considerations. Thanks for reading! Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
izak_ Posted September 4, 2016 Share Posted September 4, 2016 They are amazing, to say the least! I really like these new icons.. But seriously, they are great! Link to comment Share on other sites More sharing options...
Fossildude19 Posted September 4, 2016 Share Posted September 4, 2016 Great report and finds! Thanks for sharing it with us - glad you got out there. @piranha Should be able to help with ID's. Regards, EDIT - FossilDawg noted that Aphelaspis brachyphasis was the trilobite found at that site. Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted September 4, 2016 Author Share Posted September 4, 2016 2 minutes ago, Fossildude19 said: Great report and finds! Thanks for sharing it with us - glad you got out there. @piranha Should be able to help with ID's. Regards, Thanks Can't wait for piranha to come around, then! Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
Wrangellian Posted September 4, 2016 Share Posted September 4, 2016 Congratulations! Always fun seeing trilos from an unusual location. Do you know the age/stage more specifically? Who is 'we' - you and who? Link to comment Share on other sites More sharing options...
piranha Posted September 4, 2016 Share Posted September 4, 2016 Elrathia antiquata looks like a good match. Attached for comparison are some examples from Schwimmer 1989. figures from: Schwimmer, D.R. (1989) Taxonomy and biostratigraphic significance of some Middle Cambrian trilobites from the Conasauga Formation in western Georgia. Journal of Paleontology, 63(4)484-494 PDF LINK 2 Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted September 4, 2016 Author Share Posted September 4, 2016 1 hour ago, Wrangellian said: Congratulations! Always fun seeing trilos from an unusual location. Do you know the age/stage more specifically? Who is 'we' - you and who? I went with my grandfather. Also, the trilos from Chatsworth are 502 myo. Guzhangian age. Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
Twinlukers Posted September 4, 2016 Share Posted September 4, 2016 Nice finds!! Way to go kid!!!! keep digging!! Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted September 4, 2016 Author Share Posted September 4, 2016 36 minutes ago, piranha said: Elrathia antiquata looks like a good match. Attachedidfor comparison are some examples from Schwimmer 1989. figures from: Schwimmer, D.R. (1989) Taxonomy and biostratigraphic significance of some Middle Cambrian trilobites from the Conasauga Formation in western Georgia. Journal of Paleontology, 63(4)484-494 PDF LINK Yep, sure looks like It. Other photos on the web when I searched this showed results that look almost Identical to my specimens. Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
smt126 Posted September 4, 2016 Share Posted September 4, 2016 Great pictures and friends. Some nice specimens you found there. Link to comment Share on other sites More sharing options...
doushantuo Posted September 4, 2016 Share Posted September 4, 2016 Wow,wow,and WOW. Those are pretty good finds!! Link to comment Share on other sites More sharing options...
Wrangellian Posted September 4, 2016 Share Posted September 4, 2016 19 hours ago, MeargleSchmeargl said: I went with my grandfather. Also, the trilos from Chatsworth are 502 myo. Guzhangian age. That's the kind of info I like, thanks... That would be equivalent to the Upper Marjumian stage in the North American system. Link to comment Share on other sites More sharing options...
piranha Posted September 4, 2016 Share Posted September 4, 2016 19 hours ago, MeargleSchmeargl said: I went with my grandfather. Also, the trilos from Chatsworth are 502 myo. Guzhangian age. 14 minutes ago, Wrangellian said: That's the kind of info I like, thanks... That would be equivalent to the Upper Marjumian stage in the North American system. 502 Mya is actually Drumian Stage. But hey, what's a couple million years among friends? chart from: Gradstein, F.M., Ogg, J.G., & Schmitz, M. eds. (2012) The Geologic Time Scale 2012, 2-volume set. Elsevier Scientific Publishing, 1176 pp. 2 Link to comment Share on other sites More sharing options...
MeargleSchmeargl Posted September 5, 2016 Author Share Posted September 5, 2016 56 minutes ago, piranha said: 502 Mya is actually Drumian Stage. But hey, what's a couple million years among friends? chart from: Gradstein, F.M., Ogg, J.G., & Schmitz, M. eds. (2012) The Geologic Time Scale 2012, 2-volume set. Elsevier Scientific Publishing, 1176 pp. Well, the more ya know xD Every single fossil you see is a miracle set in stone, and should be treated as such. Link to comment Share on other sites More sharing options...
FossilDAWG Posted September 5, 2016 Share Posted September 5, 2016 (edited) The paper I linked earlier dealt with this specific site. Here is the link again. Elrathia is not present, the common trilobite is Aphelaspis brachyphasis. Admittedly the two trilobites are very similar, in fact the trilobite is misidentified as Elrathia antiquata in handouts I have seen for field trips from the geology department at UGA and other area colleges. One could never hope to distinguish them based on MeargleSchmeargl's photos. Here are photos of Aphelaspis brachyphasis from the Schwimmer & Montante (2012) paper (Southeastern Geology V. 49 p. 31-41.): Also it is noteworthy that the agnostid trilobites Glyptagnostus reticulatus, Agnostus inexpectans, and Aspidagnostus rugosus occur at the site (they are small and easily overlooked unless you are specifically looking for them). Glyptagnostus reticulatus is a biozone marker with worldwide occurrence in the Pabian (Upper Cambrian), coincident with the base of the Aphelaspis biozone. Glyptagnostus (and the other agnostid species) do not occur in the older Drumian, and are never found associated with Elrathia. Don . Edited September 5, 2016 by FossilDAWG 1 Link to comment Share on other sites More sharing options...
piranha Posted September 5, 2016 Share Posted September 5, 2016 8 minutes ago, FossilDAWG said: ...One could never hope to distinguish them based on MeargleSchmeargl's photos... I agree. Before posting I looked very closely at the A. brachyphasis figures and finally decided that E. antiquata was a better match. Luckily, you were familiar with the locality to clear this up. Link to comment Share on other sites More sharing options...
Wrangellian Posted September 5, 2016 Share Posted September 5, 2016 2 hours ago, piranha said: 502 Mya is actually Drumian Stage. But hey, what's a couple million years among friends? chart from: Gradstein, F.M., Ogg, J.G., & Schmitz, M. eds. (2012) The Geologic Time Scale 2012, 2-volume set. Elsevier Scientific Publishing, 1176 pp. That chart doesn't include the Drumian under the North American sequence, it's included in the Marjumian. I was going by the NA sequence, comparing it to MS's statement about the Guzhangian (which is above the Drumian, but also later than 502my, I notice. Which is correct?) Link to comment Share on other sites More sharing options...
piranha Posted September 5, 2016 Share Posted September 5, 2016 32 minutes ago, Wrangellian said: That chart doesn't include the Drumian under the North American sequence, it's included in the Marjumian. I was going by the NA sequence, comparing it to MS's statement about the Guzhangian (which is above the Drumian, but also later than 502my, I notice. Which is correct?) According to the chart the Drumian and Guzhangian stages each correlate within the Marjuman. I was only pointing out the Drumian is actually 502 Mya, currently set at 500.5 - 504.5 Mya. The paper that Don linked above, confirms this locality is late Middle Cambrian (Series 3: Drumian). 1 Link to comment Share on other sites More sharing options...
Wrangellian Posted September 5, 2016 Share Posted September 5, 2016 (edited) OK so the site is not Guzhangian, it's Lower Marjumian (North American scale) or Drumian (world scale)... MS might like to know that. Edited September 5, 2016 by Wrangellian Link to comment Share on other sites More sharing options...
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