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Showing results for tags 'Cambrian'.
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Location: The previous weekend I went out for a trip through the West MacDonnell Ranges, west of Alice Springs, NT, Australia. Along the way I stopped at a few locations and examined the rocks near the road for any signs of interesting fossils or minerals. Finally, at the location marked in figure 1.2 below I found some interesting shale / limestone formations that contained fossil, this image displays the locality of the fossils below. Figure 1.1 comes from 'Northern Territory Geological Survey, A Guide to the Geology and Landforms of Central Australia by R B Thompson, 1995, Pg. 103' and details the stratigraphic layers that run along the West MacDonnell ranges. The location of the fossils I am looking to identify was 30km east of the formations shown in figure 1.1. Figure 1.3 gives a rough estimate of how figure 1.1 and figure 1.2 relate to each other. From following the clear ridge of Arumbera Sandstone we can see that the ridge just north of the fossil locality is the Arumbera Sandstone. This means the finds are most likely from the Hugh River Shale or the Jay Creek Limestone. The unit age of the Hugh River Shale is listed as 535 - 505 Ma. These strata are part of the Amadeus Basin. Fossil: I'm unsure if the image below is a fossil created from a living organism or simply a geological feature. The small tube like structures on one surface of the rock are about 0.2-1mm in diameter and range from 1mm - 1cm in length, these can be seen on images 1-4, 1-5, 1-6 and 1-7. It can be hard to make out but the tube structures appear to be bunched into three long rectangular bands, this is best seen in images 1-5 and 1-6. The opposing surface of the rock has banded formations that line up with the groupings of tube structures, seen running vertical in image 1-1 and horizontal in 1-3. A curled lip of finely layered rock can also be seen on the same surface as the tube structures. [EDIT] From some further reading possibly Anabaritid? https://www.researchgate.net/publication/228488202_The_tube_wall_of_Cambrian_anabaritids Kouchinsky, A. and Bengtson, S. 2002. The Tube Wall of Cambrian Anabaritids All image, including more finds from the same location can be seen in the One Drive link below. These could possibly shed more insight. https://1drv.ms/f/s!Ai3mV0Fc5mW7g90DyT9ZE47yaQhvQw For a better perspective of the area you can check my Google Maps which has the exact location bookmarked as "Unknown Fossil Locality 1". https://drive.google.com/open?id=17sjqvyah6GekBT8y1cUCLwsgRHj300xb Fig 1.1 (Left), Fig 1.2 (Right) Fig 1.3 1-1 1-2 1-3 1-4 1-5 1-6 1-7
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- alice springs
- hugh river shale
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I was splitting a piece of shale from one of the formations that holds the Chengjiang biota, and found quite a few of these small things. They're no more than 2 mm in length and to the naked eye, look like small red lines. The pictures below were taken at 4x magnification (first picture above is one specimen, latter three are another specimen). First thought was some segmented worm, but I'm not super convinced. Any ideas?
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I’ve got some ID requests that need to be solved. First (#1) an old friend that needs to be re-evaluated I think. I know this to be solidly mid to late Cambrian in age which leads me to believe its some kind of ichofossil perhaps Cruziana. What are your thoughts?
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I recently acquired this nice algae specimen from one of the many Chinese Cambrian lagerstatten (Hongjingshao fm). The algae is preserved as a film on the shale, and unfortunately the shale is quite flaky. Several pieces of the lighter gray matrix have flaked off already, and there are quite a few other areas that look like they could fall off with the slightest bump. I can go ahead and glue the pieces that have fallen off back on, but I'd like to prevent the rest from coming off. However, I'm worried that the algae would quickly wash away if liquid touched it, especially something as harsh as acetone (if consolidated using standard methods). This is certainly the case with many fossils from similar formations. Do I have any options here?
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I was just going through a handful of Pioche Shale (Early-Middle Cambrian, Nebraska Nevada) trilo plates I bought a while ago, and found this interesting piece. I'm leaning more towards algae than worms, as they are reminiscent of the carbon film preservation of algae from Cambrian formations in China. Any thoughts?
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https://vancouversun.com/pmn/news-pmn/canada-news-pmn/burgess-shale-fossils-add-branches-to-tree-of-life-says-royal-society-report/wcm/478ac084-90cc-4d05-950b-803b635a3bfb https://royalsocietypublishing.org/doi/10.1098/rspb.2018.2314
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- agnostids
- burgess shale
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I got this from the usual place but it came with very little info (the page might have had the info but I failed to write it down and now I can't find anything on it... I sense that it will be another one of those hours-long sleuthing sessions, so I thought it's easier to ask here ) All I know is, Tsinania sp, China. I gather it's Upper Cambrian. No idea of the formation or specific location within China. Very soft powdery matrix! I can try some better pics if required.
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Dzik_Phong_2016_Stratigraphy.pdf Dating of Cambrian–Ordovician boundary strata in northernmost Vietnam and methodological aspects of evolutionary biostratigraphic inference Jerzy Dzik and Nguyen Duc Phong Stratigraphy, vol. 13, no. 2, text-figures 1–5, pages 83–93, 2016 less than 2 Mb
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- cordylodus
- conophrys
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No better way to spend a sunny, 52 degree Georgia day than fossil collecting with my son. This is the first time in about 22 years that we have collected together. We went down to the Conasauga River in Murray County to collect Cambrian trilobites. Unfortunately the River was running high and fast and it did not make Collecting easy. I had to do some fancy climbing to get to the area that I wanted to collect. Using tree limbs to hold onto, I was able to navigate the slippery slope. I only took two pictures of partial trilobites that I found, I decided not to take any more pictures because I was worried about dropping my phone in the river. Here are some of my other finds- all Aphelaspis brachyphasis, with the exception of this first piece, I believe that this is a partial Eugonocare , I have only found one other partial one in the Times I have visited this site.
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- cambrian
- trilobites
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Found associated with Elrathia kingii and Itagnostus interstricta trilobites. See field trip report here:
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- u-dig
- brachiopod
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Well, It's been a while. After a hiatus that has seemed like forever, my friend Barrett and I decided to head to the Conasauga to find us some bugs as neither of us really had anything to do this weekend and we both wanted to do something. This was Barrett's first time, so I was effectively his mentor for the day. First stop however, breakfast of southern hospitality at a local biscuit place! After that, we went right to the site, getting into the nitty gritty. The river wasn't flooding over, but it was pretty decently high. Of course, that wasn't stopping us. We got into our big water-proof boots and jumped right in. Barrett quickly got into the groove, finding a certain section of the formation that was producing very large and complete Aphelaspis Brachyphasis with just about every swing of the hammer and chisel. Then late into the day, I found THIS beauty: I was stunned. I had never seen an exoskeleton on a positive that complete from the formation before like this, and for a second I thought it was fake. (sidenote, while transporting it to the car not long after this picture, a portion of the tailshield's exoskeleton unfortunately got peeled off by a very light breeze into the wind. At least I got a picture! Very fragile!) There was also a negative, though honestly it was completely outshown. In the end, we didn't take a whole lot, but we definitely took a number of really good ones, including some of the largest complete Aphelaspis I've seen.
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FeistCourtessolebiogeograsiantypepaleozoictrilobcracscparisi1984.pdf Decouverte de Cambrien Superieur a trilobites de types est-Asiatiques dans la Montagne Noire(France meridional) Raimund Feist,Robert Courtessole C.R Acd.Sc. Paris,t.298,serie II,no 5/1984
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From the album Invertebrates
Naraoia longicaudata Zhang and Hou 1985 Early Cambrian Chengjiang Yunnan PRC -
Lit.: Y.-L. Zhao, R. L. Parsley, and J. Peng. 2007. Early Cambrian eocrinoids from Guizhou Province, South China. Palaeogeography, Palaeoclimatology, Palaeoecology 254:317-327
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- balang formation
- cambrian
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https://www.sciencemag.org/news/2018/11/some-earth-s-first-animals-including-mysterious-alien-looking-creature-are-spilling-out
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- tons of fossils
- new species
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From the album Trace Fossils
13x8cm. This may or may not be a trace fossil. It was first thought to belong to the Ediacarian fauna, but now it's at least thought to be of organic origin. Called a Pseudo-Ediacaria at the moment. Booley Bay Formation Ribband Group Drumian Middle Cambrian Site: Booley Bay, Hook Peninsula, Wexford County, Ireland- 3 comments
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- cambrian
- booley bay
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From the album Invertebrates
Guizhoueocrinus yui Early Cambrian Kaili Biota Xiasi Guizhou PRC -
Hello, friends! Not too much to go on, so I'm not expecting a definite id, really, but if anyone does have any guesses, I'd be really grateful. I received this as part of a gift and it was simply labelled "Trilobite - Nevada". The only other information the sender could tell me was that it had been found by someone else in "a canyon", not much help. I can tell you that the trilobite is 3 cm long (what's left of it) and is preserved in a soft, very thinly layered pale grey shale. It's probably going to be Lower to Middle Cambrian, maybe an olenellid? Any help would be most appreciated. Thank you! Cheers, Adam @piranha
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Please take a look at this post:
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https://www.sciencedaily.com/releases/2018/10/181015113522.htm
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- molecular fossils
- sponge
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From the album Purchased/Gift Fossils
Redlichia chinensis, Middle Cambrian, Yunnan China. -
I have noticed lately that a lot of fossils of so called Sabellidites cambriensis are popping up on a lot of sites for sale. They're sold as basal annelid worms that arose during the terminal Ediacaran. They predominantly are coming from the Lontova formation, dated at ~541-545 Mya, which is more or less the Ediacaran/Cambrian boundary. I would think that such fossils would be of great interest to researchers since, assuming they are basal annelids, they would represent one of, if not the first, appearances of a modern phylum in the fossil record. Yet the literature on this species is very sparse, with no more than half a dozen papers having been published since it's initial description in 1926. Does anyone here have any information on this subject?
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This is a piece that I picked up on a geology field trip years ago in eastern New Mexico. I apologize that I have unfortunately lost the field notebook that contains more specific location information, but I am hoping to get in contact with the teacher that took us there for other reasons and might be able to provide additional information if I can ask him. The section was Cambrian to Ordovician in age: it started with abundant stromatolites, then progressed into thrombolites and finally siliciclastics disappeared during the Ordovician sea level high-stand. If my memory serves, I believe these were found from relatively low in the section and so should be Cambrian, but it has been long enough (about 12 years) that I would not stake my life on that. Since it may be hard to tell from the photos, these are essentially organic material on the surface of the rock with no visible depth at all. I am honestly a little stumped on this ID and, without the field notebook, I simply can't remember what my professor said about them; I remember that I did not know the word he used at the time, but I was new enough to invertebrates that that could mean almost anything. My best guess is that they are gorgonians, but I am probably several phyla removed from the right ID. I am happy to take any additional photos if they will help. Thank you for your thoughts!
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This is a piece that I picked up on a geology field trip years ago in eastern New Mexico. I apologize that I have unfortunately lost the field notebook that contains more specific location information, but I am hoping to get in contact with the teacher that took us there for other reasons and might be able to provide additional information if I can ask him. The section was Cambrian to Ordovician in age: it started with abundant stromatolites, then progressed into thrombolites and finally siliciclastics disappeared during the Ordovician sea level high-stand. This piece was found from amidst microbialites, so should be Cambrian in age. My professor identified it as a "sponge" at the time. I am wondering if it is perhaps an archaeocyathid based on the age and the central hole. Either way, if anyone that is more familiar with that area has thoughts on any more specific identification, I would be thrilled! Please ask if you need photos from a different angle or anything like that. Thank you very much!
