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Showing results for tags 'Devonian'.
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This arthropod is a Marrellomorph, a clade of strange looking stem-group arthropods known from the Cambrian Burgess Shale and the slightly older Kaili Fauna in China (Marella), the Silurian Herefordshire Lagerstätte in England (Xylokorys), the Ordovician Basal Upper Fezouata Formation (lower Arenig, or lower Floian), north of Zagora in southeastern Morocco and the Caradoc (Upper Ordovician) in Bohemia (Furca) and the Devonian Bundenbach Shale in Germany (Mimetaster and Vachonisia). Marrellomorphs lacked mineralized hard parts, so are only known from areas of exceptional preservation, limiting their fossil distribution. The head shield has two pairs of long rearward directed spikes. Marrellomorphs possessed two pairs of antennae, one long and sweeping, the second shorter and stouter. The two dozen segments each have a pair of six segmented leg / feathery gill structures. There is a tiny, button like telson at the end of the thorax. The best modern guest is that Marrellomorphs are moderately evolved primitive arthropods descended from a common ancestor of the major later arthropod groups. Reconstruction of Mimetaster hexagonalis Reconstruction of another Marrellomorph - Marrella splendens - from the Cambrian Burgess Shale in Canada. A thorough re-investigation of Marrella splendens based on over 1000 specimens was recently published by D. García-Bellido and D. Collins: “A new study of Marrella splendens (Arthropoda, Marrellomorpha) from the Middle Cambrian Burgess Shale, British Columbia, Canada” in Can. J. Earth Sci. 43(6): 721–742 (2006). The overall form of Mimetaster and other Marrellomorphs suggests that it was a soft-bottom dweller. The wide carapace border would have prevented sinking into unconsolidated sediment. Mimetaster hexagonalis is the most abundant non-trilobite arthropod from this Lagerstätte. They are considered to live in groups of several individuals; two, three or even more species on one slab are not uncommon. A thorough reinvestigation of Mimetaster based on 123 specimens was recently published by G. Kühl and J. Rust in Paläontologische Zeitschrift, volume 84, number 3, 397-411.
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After such a fantastic weekend at Penn Dixie, it can be a bit of a let-down to return home. However, last Sunday Deb asked if we could go to Hungry Hollow to poke around in the Widder shale. We threw all our gear together and we were there in forty minutes. My goal was to extend some existing benches I was starting at different levels, connecting a few into a kind of multi-level "network." To that question rarely ever posed outside of a gym of "how much can you bench?" I can say "about five hours!" which was how much time it took taking a big bite out of the wall. The temperature was not too hot, and it was a nice and sunny day. Getting to this particular exposure requires some negotiating of fallen trees. Doing the limbo with a backpack full of tools is not as easy as it sounds - if it sounds easy at all! In this first pic, Deb is putting me to work. We managed to dig, pry, and remove about 15 feet on the one level, about 7 feet up at two other bench levels, and anywhere between 1 and 3 feet deep in some parts. There was a lot of slumped overburden to remove, and then some damp, crumbly shale due to the presence of a natural in-ground spring. Getting to the good shale takes both patience and sweat.
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Mass grave reveals secrets of the 'walking fish': 360-million- year-old fossils provide a glimpse into how animals moved from water to land, Ryan O’Hare, The Daily Mail, Sept. 8, 2016 http://www.dailymail.co.uk/sciencetech/article-3778234/Mass-grave-reveals-secrets-walking-fish-360-million-year-old-fossils-provide-glimpse-animals-moved-water-land.html •Scientists looked at the front limbs of early tetrapods called Acanthostega •The fossils come from a group of creatures which died in a river bed •Analysis reveals they were juveniles which spent their life in the water •Growth rings in their front legs suggests their limbs would have been too weak to support them on land Life history of the 360-million-year-old tetrapod Acanthostega rewrites the tetrapod move to land, European Synchrotron Radiation Facility. http://phys.org/news/2016-09-life-history-million-year-old-tetrapod-acanthostega.html https://www.sciencedaily.com/releases/2016/09/160907135132.htm http://www.livescience.com/56011-early-tetrapod-lived-in-water.html Sanchez, S., P. Tafforeau, J. A. Clack, and P. E. Ahlberg, 2016, Life history of the stem tetrapod Acanthostega revealed by synchrotron microtomography. Nature (2016) doi:10.1038/nature19354 Received 03 March 2016 Accepted 10 August 2016 Published online 07 September 2016 http://www.nature.com/nature/journal/vaop/ncurrent/full/nature19354.html Acanthostega - https://en.wikipedia.org/wiki/Acanthostega Yours, Paul H.
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Decided to take some extra hash shale I had boxed up and give it the vinegar bath treatment to see what might be hiding inside of it. I was actually really excited to see all the very tiny crinoid bits in there. I was stoked to see a rather tiny cup in there as well. (Uppermost sample in the photo.) A nice big Mediospirifer that literally plopped out of a random rock I had thrown in. Also found this tiny little Eldredgeops in there. Notice that's a thumbnail in the background!
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From the album: Tri-State Collection
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From the album: Tri-State Collection
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From the album: Tri-State Collection
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Grammysioidea ? Any help appreciated thanks.
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Haven't been posting lately, life has thrown me a few curve-balls this summer, but I was taking a closer look at my Penn Dixie crinoids and came across these two pieces I found on the surface of a dry pyrite bed, (Middle Devonian.) I had always thought they were crinoids—and may very well be, but they don't match up with anything that I've come across so far, especially for the area. Also, it's tough to tell in the picture but those protrusions are definitely spiny—that is to say pointed. Thank you in advance!
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Hi All, This is my first post in the forums, but probably won't be my last... I'm trying to write a kids book on evolution and want to draw some nice pictures to go with the rhymes (it's aimed at younger kids). However for the page I have written about Tiktaalik roseae I would like to do a picture of it resting on the bank of a river, with some of the likely associated flora and fauna that lived in the margins of freshwater at the time hanging out in the background/foreground (probably foreground as I suspect they were all fairly small). Unfortunately there don't seem to be a lot of good fossils from the Famennian in Canada at this time and so I was wondering if anyone would be able to help me identify some likely candidates. There is a lot of information on the tetrapods that lived with it but it seems like nobody has covered the land living/marginal species that may have crossed paths with it. There is also some info about things like e.g. Archaeopteris, Gigantocharinus, Microdecemplex, etc. but none of them seem to occur in the same location/stratigraphy. Hopefully the way I have written this doesn't make me sound completely clueless (although chances are good), as it's been a while since I've dabbled in palaeontology, but if anyone wants further clarification then let me know. Thanks in advance, this is a great website, by the way! Cheers SpoonMan
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Found this slab near Ithaca, New York in the Devonian Hamilton formation. The underside shows a lot of medium sized lines and gouges, which i interpret to be tracks. Am I wrong? Surrounding rocks were not very fossil-rich. Thanks for any help identifying these!
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Yesterday was a gorgeous day for a fossil hunting trip, and also the last day of summer before my SO had to go back to school to teach little ones. So the clan of three gathered up our bathing suits, towels, sunscreen and a bag for holding fossil finds, and we drove out to Beltzville, PA, which has a little something for everyone! At first, we were at the swimming beach, playing around and looking for fossils there... well, the pickings were little to none. I think we found a small pebble that had some bryozoans in it. That was about it. I was wondering where all the fossils were? Did we arrive just after they had all been found? I stopped looking at this point (sigh of disappointment) and swam around with my daughter in the warm lake water. We went up for lunch, dried off, and my sweetie got on his phone and did some research on the park. Turns out there are other places around the lake better suited for fossil hunting! Yay! After we ate, and the little one played on the children's playground, we piled back into the car and headed to the other side... Way fewer people, and completely fossilicious!!
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Hi everyone, I've recently done some shale collecting near the Rocky River in Ohio. I've found the shale in this area is late Devonian to Mississippian, and is good matrix to look for microfossils. I've collected some smaller material that I'm soaking and freezing to disaggregate, and also some larger material (1-6 inches). I wanted to know if anyone has had any experience with matrix from this area/from this period and if so are you more successful with smaller or larger material? Thanks very much!
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Found this fossil on July 3rd at Smokes Creek, Blasdell, NY. It is Middle Devonian, Moscow Formation, Windom Shale, Hamilton Group. Any help with identifying would be greatly appreciated. Thank you.
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From the album: Middle Devonian
Aulocystis dichotoma (branching tabulate coral) Middle Devonian Moscow Formation Windom Shale Hamilton Group Smokes Creek Blasdell, NY. -
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Devonian Nautiloid Preserved in Pyrite from Penn Dixie
Jeffrey P posted a gallery image in Member Collections
From the album: Middle Devonian
Michelinoceraas telamon (nautiloid preserved in pyrite) Middle Devonian Moscow Formation Windom Shale Pyrite Layer Hamilton Group Penn Dixie Quarry Blasdell, NY.-
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Orthid Brachiopod Preserved in Pyrite from Penn Dixie
Jeffrey P posted a gallery image in Member Collections
From the album: Middle Devonian
Tropidoleptus carinatus (Orthid brachiopod preserved in pyrite) Middle Devonian Moscow Formation Windom Shale Pyrite Layer Hamilton Group Penn Dixie Quarry Blasdell, NY. -
Spiriferid Braciopods Preservd in Pyrite from Penn Dixie
Jeffrey P posted a gallery image in Member Collections
From the album: Middle Devonian
Ambocoelia umbonata (brachiopods preserved in pyrite) Middle Devonian Moscow Formation Windom Shale Pyrite Layer Hamilton Group Penn Dixie Quarry Blasdell, NY. -
Devonian Spiriferid Preservd in Pyrite from Penn Dixie
Jeffrey P posted a gallery image in Member Collections
From the album: Middle Devonian
Cyrtina hamiltonensis (Spiriferid brachiopod preserved in pyrite) Middle Devonian Moscow Formation Windom Shale Pyrite Layer Hamilton Group Penn Dixie Quarry Blasdell, NY. -
Devonian Crinoid Anchor Holdfasts from Turbotsville, PA.
Jeffrey P posted a gallery image in Member Collections
From the album: Middle Devonian
Ancyrocrinus sp. (anchor-shaped crinoid holdfasts) Middle Devonian Mahantango Formation Swopes farm Turbotsville, PA. -
From the album: Middle Devonian
Tornoceras uniangulare (goniatite) Middle Devonian Moscow Formation Hamilton Group Deep Springs Road Quarry Lebanon, NY.- 2 comments
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Piece of Devonian Graptolite from Erie Co., NY.
Jeffrey P posted a gallery image in Member Collections
From the album: Middle Devonian
Dictyonema hamiltoniae (graptolite) Middle Devonian Moscow Formation Windom Shale Hamilton Group Penn Dixie Quarry Blasdell, NY.-
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From the album: Middle Devonian
Paleoneilo filosa (Paleotaxodonta bivalve- both valves) Middle Devonian Moscow Formation Windom Shale Hamilton Group Deep Springs Road Quarry Lebanon, NY. -
Strophomenid Brachiopod from Madison Co., NY.
Jeffrey P posted a gallery image in Member Collections
From the album: Middle Devonian
Eoschuchertella arctostriata (Strophomenid brachiopod) Middle Devonian Moscow Formation Windom Shale Hamilton Group Deep Springs Road Quarry Lebanon, NY.-
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Palaeoheterodonta Bivalve from Madison Co., NY.
Jeffrey P posted a gallery image in Member Collections
From the album: Middle Devonian
Modiomorpha concentrica (Palaeoheterodonta bivaleve- both valves) Middle Devonian Moscow Formation Windom Shale Hamilton Group Deep Springs Road Quarry Lebanon, NY.
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