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Showing results for tags 'early cambrian'.
Found 8 results
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A recent trip to Cadiz , Ca and Latham shale trilobites- it’s absolute paradise with the desert vistas and train sounds. And trilobites. I was only able to visit one day this trip, but found a few incomplete. These few were especially fun. I really could stay for days… weeks. I wonder if anyone has found cast and mold trilobites specimens at that site. And I know this should probably go to the ID section… I think the first photo are tiny trilobite eyes?
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- early cambrian
- latham shale
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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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While visiting family in Arizona and California I was able to figure out where the Marble Mountains trilobite quarry was located. It's not that far off the road system so I figured I'd give it a look see on my drive from central Arizona to Northern California. The location is only about 25 miles out of my way so why not. On my drive north I only had a few hours so this stop was mostly a fact finding trip. The view from the car windshield. The Marble Mountains are the lower hills to the left of center. The quarry area is just to the left of the gap between hills Ok, word of notice...... I DO NOT recommend driving a mustang here. I know my car and have driven many places I shouldn't hehehe. I had to stop about 1/4 mile from the site. Don't need a 4x4 but a little ground clearance is a big help. The road is a bit rocky but that is to be expected. It's about 1.5 miles from pavement to parking area. The site is just below the gray outcrop just to the left of the mountain gap. I arrived just before sunset and found some locals already at the site (you can just make out their truck in middle photo). They gave me some pointers on what to look for as they were leaving and I set to work. For the first hour I was mostly just wondering around seeing what I could see. There were no obvious recent diggings so I was gonna have to do some digging myself. Went back to the car, grabbed a headlight and went to search in the dark. After about 3 hours I packed up and left to continue my drive north. 5 days later I was on my way south back to Arizona. I stopped for a full day of digging this time. Kinda got the basics of the site during this stop. Then back on my way. A week later I was able to slip away for a full 3 day trip just to dig. I was able to spend some quality time on site. It is not a site that you can really hit well in a short time. to be continued......
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- cadiz
- california
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Geyer, G., Landing, E. 2021 The Souss Lagerstätte of the Anti‑Atlas, Morocco: Discovery of the First Cambrian Fossil Lagerstätte from Africa. Nature Scientific Reports, 11(3107):1-8 PDF LINK
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- early cambrian
- souss fossil lagerstätte
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Trilobites of the United States from my Paleo Archives Collection
Olenellus posted a topic in General Fossil Discussion
Trilobites of the United States from my Paleo Archives Collection (Refer to Attached File) (1) Olenellus clarki and Olenellus fremonti (Early Cambrian), Marble Mts, California (2) Elathria kingii (Middle Cambrian) from Wheeler Amphitheater, Utah (3) Phacops rana milleri (Middle Devonian) of Sylvania Fossil Beds, Ohio (4) Ameura missouriensis (Upper Pennsylvanian), Jemez Springs, New Mexico
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- early cambrian
- middle cambrian
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Unidentified Trilobite from Southern Nevada
Fossildude19 posted a gallery image in Member Collections
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From the album: Fossildude's Purchased/Gift Fossils
A very cheap pickup from the auction site. No information other than Nevada given.© 2019 T. Jones
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- early cambrian
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QUOTE: "In addition, at least one specimen of Palaeolenus lantenoisi shows the preservation of an unusual combination of digestive structures: a crop and paired digestive glands along the alimentary tract. This combination of digestive structures has also never been observed in trilobites this old, and is rare in general, with prior evidence of it from one juvenile trilobite specimen from the late Cambrian Orsten fauna of Sweden and possibly one adult trilobite specimen from the Early Ordovician Fezouata Lagerstätte. The presence and combination of these digestive features in the Guanshan trilobites contradicts current models of how the trilobite digestive system was structured and evolved over time." Hopkins, M.J., Chen, F., Hu, S., & Zhang, Z. (2017) The oldest known digestive system consisting of both paired digestive glands and a crop from exceptionally preserved trilobites of the Guanshan Biota (Early Cambrian, China). PLoS ONE 12(9)e0184982:1-14 OPEN ACCESS PDF SUPPLEMENTAL PDF
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- early cambrian
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Curious Early Cambrian Conical Critters From The Harkless Formation, Nevada
Virgilian posted a topic in General Fossil Discussion
Here's an image I received the other day from a paleo-enthusiast acquaintance who with impressive regularity continues to pull interesting material for study out of his numerous digs in Nevada. Thought I might "get a kick out of it." I certainly did. The specimens come from the Lower Cambrian Harkless Formation of Nevada. Largest is about a quarter inch long (a little over 6mm). The back-story here is that they were rather confidently identified in the field as Salterella--an extinct member of the phylum Agmata, a phylum erected in 1977 by the late paleontologist Ellis L. Yochelson. They are of unestablished zoological affinity, which is to say that Agmatans cannot be definitely categorized with any modern organismal analog. What's especially fascinating about Salterella and its Agamatan Early Cambrian "cousin" Volborthella (which occurs in geologically older Early Cambrian strata, below Salterella's stratigraphic range) is that the Agmatan animal agglutinated minute mineral grains, incorporating them into its growing shell--that is to say, the actual soft-bodied creature who constructed the shells made a "conscious" decision about which specific minerals in its environment were best suited to include in its expanding shell-home. Back at home, though, identification dubiety set it. Now, he's not so certain. Thinks they could well be assigned to the extraordinarily rare Early Cambrian genus Lidaconus--which is not an Agmatan, apparently, though it bears a striking external superficial resemblance to Salterella--originally described from a couple of Nevada localities situated not too far from where these curious specimens were recovered. By the way--Just in case one speculates whether such specimens referred to Salterella, Volborthella, or Lidaconus could possibly be sclerites--in other words, the conical curiosities do not represent products of individual animals, but rather they're the dissociated components of a larger creature (fragmented "spikes" of some kind of "armored worm," for example)--that idea has already been proposed in the scientitic literature; and it's already been falsified, completely discredited. So, Salterella--or Lidaconus? Some uncertainly now exists, admittedly. Both Salterella and Lidaconus occur within the Bonnia–Olenellus trilobite Zone, in the upper part of the Harkless Formation. Lidaconus is slightly younger, stratigraphically speaking. The paleo-acquaintance also mentioned that he'd probably have to resort to cross-sectioning a few of the specimens; Salterella and Lidaconus can be distinguished on the basis of distinctive internal morphological differences. We'll see what transpires.- 7 replies
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- early cambrian
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