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Showing results for tags 'holocene'.
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Besides of the tooth and several other bones I also found some this vertebra: I am really not sure if its a mammal vert or something. Is it even fossil? I have my doubts.... Its from the area of Ijmuiden (Netherlands), so its probably from the Holocene. Can anybody help on the id? Again perhaps @LordTrilobite or @Harry Pristis ?
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Ancient moss awakens amid thawing ice caps and permafrost
Oxytropidoceras posted a topic in Fossil News
Ancient life awakens amid thawing ice caps and permafrost By Daniel Ackerman, The Washington Post, July 7, 2019, https://www.washingtonpost.com/science/ancient-life-awakens-amid-thawing-ice-caps-and-permafrost/2019/07/05/335281f8-7108-11e9-9f06-5fc2ee80027a_story.html Aulacomnium turgidum - Swollen Thread-moss PDF file - https://rbg-web2.rbge.org.uk/bbs/Activities/mosses/Aulacomnium turgidum.pdf Wikipedia - https://en.wikipedia.org/wiki/Aulacomnium_turgidum The papers are: Roads, E., Longton, R.E. and Convey, P., 2014. Millennial timescale regeneration in a moss from Antarctica. Current Biology, 24(6), pp.R222-R223. https://www.sciencedirect.com/science/article/pii/S0960982214000864 La Farge, C., Williams, K.H. and England, J.H., 2013. Regeneration of Little Ice Age bryophytes emerging from a polar glacier with implications of totipotency in extreme environments. Proceedings of the National Academy of Sciences, 110(24), pp.9839-9844.s https://www.pnas.org/content/110/24/9839 Yours, Paul H.- 1 reply
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Fossil planktonic foraminifera indicate that marine ecosystems have entered the Anthropocene
Oxytropidoceras posted a topic in Fossil News
Fossil zooplankton indicate that marine ecosystems have entered the Anthropocene. Center for Marine Environmental Sciences, University of Bremen https://www.sciencedaily.com/releases/2019/05/190528120605.htm https://www.eurekalert.org/pub_releases/2019-05/m-cf-fzi052319.php https://natureecoevocommunity.nature.com/users/260397-lukas-jonkers/posts/49174-fossil-zooplankton-shows-that-marine-ecosystems-have-entered-the-anthropocene The paper is: Lukas Jonkers, Helmut Hillebrand, Michal Kucera. 2019. Global change drives modern plankton communities away from the pre-industrial state. Nature, 2019; DOI: 10.1038/s41586-019-1230-3 http://dx.doi.org/10.1038/s41586-019-1230-3 Yours, Paul H.-
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In addition to the possible orthocone fossil I found in the same creek, I found this mammal bone. I live about ten miles as the crow flies from Big Bone Lick State Park in Kentucky. I live on a cattle farm (have had horses on the farm before as well spanning at least 50 years). This bone struck me as looking quite old due to the coloration and the slight erosion on it. With me living on a cattle farm, I’m leaning towards it being some sort of bovid bone, but want to know your all’s opinion. Thanks!
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My name is Melanie and I am from Germany. I am normally interested in Holocene extinctions. But fossils in general seems to be also a thrilling subject.
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Ancient farmers spared us from glaciers but profoundly changed Earth's climate University of Wisconsin-Madison, September 6, 2018 https://www.sciencedaily.com/releases/2018/09/180906141507.htm If You Hate Ice Ages, Thank a Farmer Chopping down forests and irrigating rice paddies boosted greenhouse gases enough to prevent the onset of a new ice age Ronald Bailey|Sep. 10, 2018 2:05 pm https://reason.com/blog/2018/09/10/thank-a-farmer-if-you-hate-ice-ages The papers are: Vavrus, S.J., He, F., Kutzbach, J.E., Ruddiman, W.F. and Tzedakis, P.C., 2018. Glacial Inception in Marine Isotope Stage 19: An Orbital Analog for a Natural Holocene Climate. Scientific reports, 8(1), no.10213. (open access paper) https://www.nature.com/articles/s41598-018-28419-5 http://discovery.ucl.ac.uk/10053186/1/Vavrus_Glacial.pdf Ruddiman, W.F., 2003. The anthropogenic greenhouse era began thousands of years ago. Climatic change, 61(3), pp.261-293. http://users.clas.ufl.edu/rrusso/gly6932/ruddiman_03.pdf http://www.whoi.edu/cms/files/ruddiman03cc_68543.pdf Yours, Paul H.
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Howdy from Nebraska. My name is Richard and I have had a long time interest in finding the remains of extinct species from the late Pleistocene and early Holocene.
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Given to me by a member of the Australian Fossil Club. Will add more information about the formation soon.
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Shell preservation.
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Shell preservation. There are also one or two Macoma balthica and Spisula sp. bivalves on this plate.
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Shell preservation.
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Holocene Planktonic Foraminifera from the Dry Tortugas, Part 2
Rumi posted a blog entry in Microfossil Mania!
Since the upload of Part 1 succeeded, I'll now offer up Part 2, a look at two interesting taxa from the family Globigerinidae. This family contains most of the taxa that we associate with the idea of "planktonic forams", perhaps due to our familiarity with the "globigerina oozes" that form a significant part of the floor of the modern world oceans. Globigerinoides ruber (d’Orbigny, 1839) is one of the two “red” species of globigerinids, as the specific epithet indicates. It is well-known that the color of individual specimens varies from white to pinkish-red, and it is typically the case that only some of its globular chambers exhibit the red coloration. I have specimens with all white chambers, one red chamber, two red chambers, etc., and have a single individual that is all red. Interestingly, the intensity of the color seems to increase with the number of chambers affected, so the all red specimen is very red indeed -- it is also a little smaller than average. Here is a typical specimen seen from the umbilical side, in a slightly oblique view, showing the primary aperture and one red chamber: The genus Globigerinoides differs from Globigerina in that its species exhibit secondary apertures, formed at the junctions of the spiral suture with intercameral sutures: Here is the spiral side of the same specimen, again presented in an oblique view, with two supplementary apertures, two red chambers at the left, and a pale pink one at the right. The top, final chamber is white, as is most frequently the case. This taxon is the commonest foram in the sample, by a large margin. The other red globigerinid is Globoturborotalita rubescens (Hofker, 1956). According to the World Foraminifera Database, it also occurs in the Gulf of Mexico, but I have seen no specimens in my sample as yet. This taxon shows four chambers in the umbilical view, rather than three, and lacks the secondary apertures. A second interesting globigerinid, quite different from the preceding, is Globigerinella siphonifera (d’Orbigny, 1839). This genus exhibits planispiral forms, rather than trochospiral -- all of the chambers are in the same plane. (Actually, the test begins growth in a trochospire, but quickly switches growth pattern to planispiral.) There is a primary aperture at the base of the final chamber, and in fully mature specimens like this one, the initial chambers enter the final one through the primary aperture: The final chamber appears to be “gobbling up” the initial chambers, like the snake that swallows its own tail. In Part 3 of this entry, I’ll examine three taxa from the Family Globorotaliidae. Stay tuned....... -
Holocene Planktonic Foraminifera from the Dry Tortugas, Part 1
Rumi posted a blog entry in Microfossil Mania!
Planktonic Foraminifera are particularly important in biostratigraphic studies and correlation, as they are ubiquitous in marine deposits, and evolve rapidly. They first appeared in Middle Jurassic time, and thus have a long geological history. There are many phylogenetic and correlational studies available, and their rapid evolution makes them exceptionally useful as temporal markers, or guide fossils. I am currently looking at planktonic Foraminifera from a deep-water sample that was collected from the Dry Tortugas Islands, off of the coast of southern Florida. The sample was dredged from a depth of 215 meters, due south of the islands. This is an interesting area, as it represents the eastern extremity of the Gulf of Mexico, as well as the northern edge of the Caribbean Sea. The sample is a very rich one, with numerous species of benthic Foraminifera, as well as a few ostracodes. There is a good selection of planktonic forams -- I have thus far identified ten species, and would like to discuss one of these, a member of the Family Pulleniatinidae. Pulleniatina obliquiloculata (Parker & Jones, 1862) is a rather unusual looking taxon, starting with a trochospiral growth pattern, but switching to a streptospiral pattern for its final chambers. It is globulose, and quite shiny, making it easy to recognize. It took me some time to locate a specimen for imaging, as most specimens have their aperture clogged with matrix. The aperture is low, but very broad, and the apertural surface of the chamber below it is strongly pustulose. If this image were rotated toward the viewer a bit it would be clear that a thin area just above the lip of the aperture (seen here as an imperforate band) also bears pustules, although they are not as strong as those beneath the aperture. For those interested in taxonomy, this species is the generotype of Pulleniatina. I am submitting this short blog entry to see if the recent problems with uploading to the forum have been fixed. If so, I'll be submitting other entries on this sample. -
Shakum, J. D., 2018. Pollen weighs in on a climate conundrum Science News and Views, Paleoclimate, January 31, 2018 https://www.nature.com/articles/d41586-018-00943-4 "Simulations by climate models show that Earth warmed during the Holocene epoch, whereas ocean sedimentary cores suggest that global cooling occurred. An analysis of fossil pollen samples now sides with the models." Jeremiah Marsicek, Bryan N. Shuman, Patrick J. Bartlein, Sarah L. Shafer & Simon Brewer, 2018, Reconciling divergent trends and millennial variations in Holocene temperatures. Nature. 554, pages 92–96 doi:10.1038/nature25464 https://www.nature.com/articles/nature25464 Yours, Paul H.
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Kansas Quaternary Stratigraphic Nomenclature Formally Revised (open access paper)
Oxytropidoceras posted a topic in Fossil News
The stratigraphic nomenclature for Kansas has been formally revised. The result is lots of changes to the nomenclature made to acknowledge serious problems with five stage glacial model. Layzell, A.L., Sawin, R. S., Mandel, R. D., Ludvigson, G. A., Franseen, E. K., West, R. R., and Watney, W. L., 2017, Quaternary Stratigraphy and Stratigraphic Nomenclature Revisions in Kansas; in, Current Research in Earth Sciences: Kansas Geological Survey, Bulletin 263, 6 p. http://www.kgs.ku.edu/Current/2017/Layzell/index.html http://www.kgs.ku.edu/Current/2017/Layzell/Bulletin263.pdf http://www.kgs.ku.edu/Current/contents.html https://www.researchgate.net/profile/Greg_Ludvigson Yours, Paul H. -
I found the coolest rock I may have ever found today while out hunting for fossils. I hit the mother load on the fossils, but the rock is absolutely more fascinating at this point. More on the fossils later. I think the rock is a fragment of a septarian nodule that seems to be comprised almost entirely of what I believe may be aragonite and maybe a tiny bit of calcite. I found it in Post Oak Creek practically in the Sherman city limits. The formation in the creek is Alluvium which is Quaternary, Holocene, Cenozoic (in reverse order) I believe. It is surrounded by Austin chalk which is cretaceous. Can anyone help confirm the identity or tell me otherwise? Also, can anyone educate me about septarian nodules of this nature in the Alluvium or do you think It came out of the Austin Chalk? Any help our input is appreciated. Close up so you can see the crystle color and crystal form. Is it araganite? @ynot I know you’re a crystle/mineral guy. What do you think? Any idea how it formed? I saw a different kind of septarian nodule last week at Fossilmania in Glen Rose that came from the Main Street formation in Dallas county that were formed around ammonites. These look pretty different than those though.I’d call this the top down look. Side 1 of 5. It looks a bit like a thin separating ridge or wall/fin like structure that is also aragonite looking or a brown crystal. Side 2. There are some kind of clear yellow crystals mixed with the brown with a different shape to them. There’s even some amber looking color in there. Side 3 Side 4 Side 5
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Here are a few pictures of late-Pleistocene and Holocene macrofossils recovered from lake and wetland deposits in the southern Great Lakes Region (sorry, not all photos have scales for size). Hoping that @Doctor Mud will add a few from his investigations in New Zealand. Ceratophyllum demersum (hornwort) achene Myriophyllum exalbescens (milfoil) turion in silt Ephippium of a cladoceran (water flea) Achene of Potamogeton (pondweed) Picea (spruce) body fossil with Castor canadensis (beaver) gnawing (ichnofossil) and beetle borings (ichnofossil) Planorbella campanulata (snail) Perca flavescens (yellow perch) scale And just in time for Thanksgiving... Oxycoccos macrocarpon (cranberry) fruit
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Fossil Coral Reefs Show Late Pleistocene Sea Level Rose in Bursts
Oxytropidoceras posted a topic in Fossil News
Fossil coral reefs show sea level rose in bursts during last warming Reefs near Texas endured punctuated bursts of sea-level rise before drowning, Jade Boyd, Rice university, October 19, 2017 http://news.rice.edu/2017/10/19/fossil-coral-reefs-show-sea-level-rose-in-bursts-during-last-warming-2/ https://www.sciencedaily.com/releases/2017/10/171019100954.htm Pankaj Khanna, André W. Droxler, Jeffrey A. Nittrouer, John W. Tunnell Jr, Thomas C. Shirley. Coralgal reef morphology records punctuated sea-level rise during the last deglaciation. Nature Communications, 2017; 8 (1) DOI: 10.1038/s41467-017-00966-x https://www.nature.com/articles/s41467-017-00966-x Yours, Paul H.- 1 reply
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I had talked to @Peat Burns about posting something a little different on TFF. Quaternary fossils from wetland deposits. Still fossils, but a bit different to what we mostly see on here. I want to get better images. We need to set up the camera on the dissecting scope, so here are some rough and ready shots taken down the eyepiece with my phone. Better images to come. These plant fragments tend to be tubular structures about 5 mm across. The Petri dish in the first shot is 5 cm across. Locality: Holocene wetland deposits, New Zealand. These are about 2000 years old based on radiocarbon dating. The last image shows some type of node I think, circular area about 3 mm across. Im guessing this could be tissue from some sort of rhizome network of a wetland plant. I'd like to know as it is very common in some layers of the sediment and I tried radiocarbon dating it. It produced dates that are about 1000 years older than the rare leaves and seeds I could find and I'm curious as to what it is. In this situation you can get things over 1000 years older than they should be as the plants are actually using old carbon. Some plants can use old dissolved inorganic carbon that can come from eroding limestone or groundwater. Thanks for looking!
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Fossils Reveal Why Caribbean Mammal Did Not Become Extinct
Oxytropidoceras posted a topic in Fossil News
Fossils reveal how bizarre mammal beat extinction Society of Vertebrate Paleontology, August 24, 2017 https://www.sciencedaily.com/releases/2017/08/170824182708.htm https://phys.org/news/2017-08-fossils-reveal-bizarre-mammal-extinction.html https://phys.org/news/2017-08-caribbean-mammal-extinctions-spurs-renewed.html Yours, Paul H. -
Years of collecting the strand line in Asbury Park, NJ, have revealed a lot of the rarer elements of the modern shallow marine fauna, as well as of the Cretaceous marine biota whose fossils wash up there. But this month I was astounded to come across this shell, which I believe to be a craniid brachiopod's dorsal valve. Based on its condition I can't be sure whether it's modern, subfossil, or even Cretaceous. It's matrix-free and shows signs of having been encrusted by cheilostome bryozoa. Can someone confirm or refute this ID? Can someone with expertise in the Cretaceous coastal plain comment on the likelihood of this specimen's possible Cretaceous origin? Thanks!
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My father and I are planning on taking a trip fossil hunting this summer, we can't seem to find anywhere that really seems worth driving to. (Everything around us is basically Devonian.) We were looking for something different: Mosasaur, Arthropods (Cambrian preferred), Holocene, etc. My dad loves actual bones and I love arthropods from Cambrian. We came to a consensus and are looking for anything marine in the Mid-West. But we will take any suggestions into consideration! (We are new-ish to fossil hunting and are willing to go anywhere and do anything.
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Hi all, Picked this fossil up at the fossil fair Ede last weekend, and I have no clue what it is. The paper that came with it said (in Dutch): "cleitrum / schelvisachtige" and apparently it's from the very early Holocene, and it was found in Ymuiden (NL). Doing a quick Google translate, I got as a translation: cleithrum / haddock-like. Those were new words to me, so I googled them and saw that a cleithrum is part of the skeleton of bony fish (though I still don't know where), and that a haddock is a kind of fish. So now I ask you, what exactly is it? And where in the fish would it have been? Thanks in advance! Max
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I found this on a beach in Florida a few years ago but I don't know what it is. It looks like some kind of jawbone but I don't know about all the tiny holes in it.
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From the album: Craniate's Collection
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