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Showing results for tags 'paleogene'.
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K-Pg Impact Spurred the Evolution of the Modern Rainforest
Oxytropidoceras posted a topic in Fossil News
How the Dinosaur-Killing Asteroid Spurred the Evolution of the Modern Rainforest New evidence from fossil plants shows today’s South American rainforests arose in the wake of Earth’s fifth mass extinction. Smithsonian Magazine Prior to the Chicxulub impact, rainforests looked very different Plant fossils from Colombia show a turnover from conifers to today's forests. by Doug Johnson, Ars Technica, April 1, 2021 Paper Carvalho, M.R., Jaramillo, C., de la Parra, F. et al. 2021. Extinction at the end-Cretaceous and the origin of modern Neotropical rainforests. Science. Vol. 372, Issue 6537, pp. 63-68 Related papers Wing, S.L., Herrera, F., Jaramillo, C.A., Gómez-Navarro, C., Wilf, P. and Labandeira, C.C., 2009. Late Paleocene fossils from the Cerrejón Formation, Colombia, are the earliest record of Neotropical rainforest. Proceedings of the National Academy of Sciences, 106(44), pp.18627-18632. Graham, H.V., Herrera, F., Jaramillo, C., Wing, S.L. and Freeman, K.H., 2019. Canopy structure in Late Cretaceous and Paleocene forests as reconstructed from carbon isotope analyses of fossil leaves. Geology, 47(10), pp.977-981. Yours, Paul H.- 1 reply
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- asteroid impact
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I found this on online and am considering on getting it. Also, I'm new to online and don't know much about it.
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Good evening. I need your help. This bone was found in Paleogene sandstones (not redeposition, bedrock) next to a petrified opalized tree. Replacement is visible on the break. Who do you think it could belong to? Thanks! Have a nice evening
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L1: 7.6 cm L2: 6.2 cm W: 6.0 cm
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- cenozoic
- chondrichthyes
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I propose to show us your Cenozoic corals. It is not necessary that it are identified although it would be better. What is necessary is that it are dated. Ok? Come on, I'll start. Cyathoseris castroi (Mallada, 1887) Lutetian South Pyrenean basin
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- corals
- from all over the world
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As Larry familiarizes himself with how to attach photos to his posts, I will be posting for him. Larry is a humble collector of mammals but he is very experienced. He is one of the rare mammal collectors with knowledge of Eocene-Pleistocene groups. Most collectors specialize in Oligocene or Miocene-Pleistocene of North America but he knows a wide variety of forms specializing in ungulates (hoofed mammals of the Perissodactyla and Artiodactyla. He's hunted from California to Nebraska and South Dakota to Texas. The first specimen he'd like to share with the forum is a 2-tooth maxilla section of Cardiolophus, an early tapiroid from the Early Eocene, Willwood Formation of Bighorn Basin, Wyoming. A tapiroid is a perissodactyl (odd-toed ungulate) that currently appears to be part of the lineage that connects to modern tapirs or is likely related to that lineage. Larry might ask me to clarify that further. One thing to remember about Cardiolophus is that it was part of a great radiation of mammals that appeared at the base of the Eocene. It was the time of the earliest horse, tapir, chalicothere, and titanothere.. These animals were very much alike in form and dentition as they descended from a common ancestor in the Late Paleocene. Also attached is a photo of jaw sections of Cardiolophus. Jess
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Help request! I am putting together a tool for judging rock age based on very crude, whole-rock, hand-sample observations of fossil faunas/floras -- the types of observations a child or beginner could successfully make. I view this as a complement to the very fine, species-level identifications commonly employed as index fossils for individual stages, biozones, etc. Attached is what I've got so far, but I can clearly use help with corals, mollusks, plants, vertebrates, ichnofossils, and the post-Paleozoic In the attached file, vibrant orange indicates times in earth history to commonly observe the item of interest; paler orange indicates times in earth history to less commonly observe the item of interest. White indicates very little to no practical probability of observing the item of interest. Please keep in mind that the listed indicators are things like “conspicuous horn corals,” purposefully declining to address rare encounters with groups of low preservation potential, low recognizability, etc. Got additions/amendments, especially for the groups mentioned above? Toss them in the comments below! Thank you..... https://docs.google.com/spreadsheets/d/1tVm_u6v573V4NACrdebb_1OsBEAz60dS1m4pCTckgyA- 5 replies
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- algae
- ammonoidea
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The lost continent of Zealandia hides clues to the Ring of Fire's birth
Oxytropidoceras posted a topic in Geology
Expedition reveals the violent birth of Earth’s hidden continent Zealandia, forged in a ring of fire The conversation, February 6, 2020 https://theconversation.com/expedition-reveals-the-violent-birth-of-earths-hidden-continent-zealandia-forged-in-a-ring-of-fire-130860 The lost continent of Zealandia hides clues to the Ring of Fire's birth By Stephanie Pappas - Live Science https://www.livescience.com/zealandia-tied-to-ring-of-fire.html Related publications Sutherland, R., Dickens, G.R., Blum, P., Agnini, C., Alegret, L., Asatryan, G., Bhattacharya, J., Bordenave, A., Chang, L., Collot, J. and Cramwinckel, M.J., 2020. Continental-scale geographic change across Zealandia during Paleogene subduction initiation. Geology. Open access https://pubs.geoscienceworld.org/gsa/geology/article/581016/Continentalscale-geographic-change-across International Ocean Discovery Program Expedition 371 Preliminary Report http://publications.iodp.org/preliminary_report/371/371PR.PDF http://publications.iodp.org/preliminary_report/371/ Zealandia: Earth’s Hidden Continent, GSA Today Article, pp. 27–35 Web Page: https://www.geosociety.org/gsatoday/archive/27/3/article/GSATG321A.1.htm PDF: https://www.geosociety.org/gsatoday/archive/27/3/pdf/GSATG321A.1.pdf Yours, Paul H.-
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- international ocean discovery program
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It was found in South East London, in a fossily area. Found 3 days ago and cleaned today.
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Found at a paleogene site in South East London
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I found this bone in the san sebastian limestone, in Puerto Rico. I always find interesting fossils there, but this is the first bone I collect. There have been skeletons of extinct sirenia found in this exact same place, so maybe it could actually a fossilized bone from an extinct species. I have no clue when it comes to bones though, so an expert is highly apreciated.
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Hi guys I’ve posted this in a separate thread as I am hoping to get an ID on them in time for fossil of the month, any ideas? (Second one might not be a mammal just checking) also is the bone avian? from abbey wood paleogene blackheath member Thanet formation
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Hi guys I found all this stuff searching through abbey wood micro matrix I collected last Wednesday and I was wondering if you could help me ID any of it thanks in advance location:Lesnes abbey wood, london age:paleogene formation: blackheath member, Thanet formation 1. Some type of fish jaw? 2.reptile or fish vert? 3.coral? 4.fish bone? 5.fish vert? 6.coprolite? 7.fishvert?
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Paleobiology of the Upper Cretaceous-Lower Paleogene Trans-Saharan Seaway, Mali (open access publication)
Oxytropidoceras posted a topic in Fossil News
O'Leary, M.A., Bouaré, M.L., Claeson, K.M., Heilbronn, K., Hill, R.V., McCartney, J.A., Sessa, J.A., Sissoko, F., Tapanila, L., Wheeler, E.A. and Roberts, E.M., 2019. Stratigraphy and paleobiology of the Upper Cretaceous-Lower Paleogene sediments from the Trans-Saharan Seaway in Mali. (Bulletin of the American Museum of Natural History, no. 436). http://digitallibrary.amnh.org/handle/2246/6950 Warning: the low-resultion PDF is about 204 MB and the high-resolution PDF is about 383 MB. Yours, Paul H.- 2 replies
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- bone beds
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Gelfo, J.N., Goin, F.J., Bauza, N., and Reguero, M., 2019. The fossil record of Antarctic land mammals: commented review and hypotheses for future research. Advances in Polar Science. 30(3): 251-273 doi: 10.13679/j.advps.2019.0021 (open access) http://www.aps-polar.org/paper/2019/30/03/A190814000002 PDF: http://www.aps-polar.org/paper/2019/30/03/A190814000002/full Gelfo, J.N., López, G.M. and Santillana, S.N., 2017. Eocene ungulate mammals from West Antarctica: implications from their fossil record and a new species. Antarctic Science, 29(5), pp.445-455. (open access) https://www.researchgate.net/publication/318350360_Eocene_ungulate_mammals_from_West_Antarctica_implications_from_their_fossil_record_and_a_new_species https://www.researchgate.net/profile/Javier_N_Gelfo Yours, Paul H.
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- antarctica
- eocene
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So I went to this river thinking i was going to have a blast cannon balling into the deepest areas except I found an excellent specimen and spent the rest of my day collecting amazing fossils.
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Hey-oh! I found this while at GMR and I'm clueless as to what (if anything) it is. I've been though my fossil books and online but the curvature and the indention marks have me puzzled. I've not found something like this before. My luck it is a weird curious rock.. if it is, I'm just going to imagine it's a meg eye lid or something hahaha As always, I welcome your thoughts and appreciate you all Steve
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Dear Guys, Few months ago when I still was in Varena town I found this tiny osteoderm (probably lizard) in dolomite erratic with some other remains. By rough surface texture the fossil looks similar to Helodermatid but lizards consist of many families... Please help to identify this remain to know the age for sure, I would think it should be from Paleogene. Any help will be appreciated! Best Regards Domas
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Before These Parasitic Wasps Finished Devouring Live Flies, They Became Fossils. In fly pupae that turned to stone, scientists found evidence that wasps have been infesting other insects for tens of millions of years. By Nicholas St. Fleur, Aug. 28, 2018 https://www.nytimes.com/2018/08/28/science/wasps-parasites-fossils.html Digitally Resurrected: Parasitic Wasp Xenomorphia resurrecta Deposits An Egg in a Fly Pupa (IMAGE) https://www.eurekalert.org/multimedia/pub/179216.php The paper is: Thomas van de Kamp, Achim H. Schwermann, Tomy dos Santos Rolo, Philipp D. Lösel, Thomas Engler, Walter Etter, Tomáš Faragó, Jörg Göttlicher, Vincent Heuveline, Andreas Kopmann, Bastian Mähler, Thomas Mörs, Janes Odar, Jes Rust, Nicholas Tan Jerome, Matthias Vogelgesang, Tilo Baumbach and Lars Krogmann, 2018, Parasitoid biology preserved in mineralized fossils. Nature Communications 9, Article number: 3325. Article | Open | Published: 28 August 2018 https://www.nature.com/articles/s41467-018-05654-y Yours, Paul H.
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A Late Cretaceous - Early Paleogene flint from southern Poland, full of fossils - mainly dasyclad algae and forams, I think, possibly some bryozoans too, and... a sun-shaped object. Any ideas?
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Hi, I've just got back from one of my collecting trips to Bouldnor Cliff and picked up an odd mammal tooth crown that I was hoping I may be able to get some help with. The specimen constitutes part of the crown and the roots of an as of yet unidentified tooth (possibly molar?). What struck me about it upon picking it up is that the morphology of the tooth and it's roots do not resemble the usual (and common) dental material from Bothriodont anthracotheres which constitute the vast majority of mammal finds from the upper Hamstead Mbr. I've compared it to the Bothriodon teeth and jaws in my collection and can't find a match with either upper, lower or anterior dentition. The specimen (although partial) is also considerably bigger than the anthracothere teeth, so all in all I feel fairly secure in eliminating them as a possibility. I was wondering if it's possible this may be a piece of entelodont tooth. The Entelodontidae are represented in the upper Hamstead Mbr. by Entelodon magnum, although the material is restricted to isolated teeth and very rare. Unfortunately the occlusal surface is missing which makes it impossible to determine whether the tooth was bunodont or not, however the crown does seem to be quite "bulbous" at it's boundary with the roots, which is a feature I've seen in some entelodont teeth before. That said I don't want to rush to conclusions. If anyone has an experience with entelodont teeth or material and is able to help it would be much appreciated, as this would be a particularly exciting find! Thank you, Theo 1. Lateral view showing contact between crown and roots 2. Lateral view showing the surface where the tooth has been broken revealing inner dentine 3. Occlusal view 4. View of the partial roots on the underside of the specimen 4.
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Heading to Green Mill Run in NC, looking for information.
SerratedTeeth posted a topic in Fossil Hunting Trips
I am planning to head over to Green Mill Run in North Carolina this coming weekend (6/16/18) to do some hunting. I have done a little research but haven't come across too much. I know there are lots of shark teeth, as well cretaceous, paleogene, and neogene fossils. I was curious if anyone has been, and if so what some of the hot spots might be. Not sure if I should head closer to the main river, or stay within the smaller channels to search. Will probably do some visual hunting as well as sifting. Any information would be greatly appreciated! -
Fragment of M3 from a talpid (cf. Myxomygale sp.) collected through screen washing of matrix from the White Band.
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Hi, I headed out for a full day of collecting at Hamstead on Saturday, and thought I'd share how it went. I reached the beach at Hamstead Duver around 9am and began searching the foreshore. The finds on this part of the coast are washed round by longshore drift, but it can be a productive section. This was definitely the case on Saturday, within the first 20 odd metres I picked up various pieces of trionychid carapace, Emys fragments, and the worn trochlea of an anthracothere humerus. I continued west along the coast before reaching the slipway (a disused boat launching ramp, apparently used by the US military in preparation for the Normandy Landings) the point where Hamstead Cliffs begin. Having not been able to visit in nearly a month, and after weeks of pretty violent storms over Christmas and the New Year, the coast at Hamstead Ledge has now completely changed. Most of the sand and gravel has been taken off the beach leaving large exposed areas of Bembridge Marls strata on the foreshore. The junction bed between the underlying Bembridge Limestone and Bembridge Marls is also now visible (usually obscured by sand and gravel). The Bembridge Limestone Fm. lays beneath the Bouldnor Fm. and was laid down in a series of large carbonate lakes on a heavily forested sub-tropical coastal plain stretching across what is now the northern Island. At 34.0 million years ago rising sea levels flooded the plain and the estuary/lagoons of the lower Bembridge Marls were deposited, which can be observed in the low cliff face. (A small normal fault can be seen in the Bembridge Marls highlighted in yellow, additionally the 'thin white horizon' is the western limits of the famous Insect Limestone. However it is un-lithified and does not produce insects at this locality) The largest change however was an enormous landslide just west of the ledge in the high cliff face. As well as several smaller falls and slips, this slip has littered the beach with clay debris and small trees. It's on the site of a large mudflow from last winter, I reckon the heavy rain saturated the already weakened area and triggered a large scale failure of the cliff face. I checked through the debris (and the exposed strata) and found some very nice pieces, including a huge piece of trionychid hypoplastron (the largest turtle piece I've ever found), a fragment of alligator jaw, a large fish vertebra, and two large baso-occipital bones from Bowfins (Amia sp.). As the beach was covered with clay blocks the foreshore wasn't very productive for ex-situ finds. As the tide dropped I moved further west towards Cranmore and beach conditions returned to normal with shingle, sand, and gravel, and a nice variety of finds. The best finds were a couple of anthracothere teeth, including a very nice canine. Coprolites were also very common as usual, most, if not all, are likely crocodilian. Further west there are exposures of the Upper Hamstead Member on the foreshore which if you're lucky turn up in-situ finds. The Upper Hamstead Member dates from approximately 33.2 - 32.4 million years ago. This time I was in luck, I spotted a large bone fragment and a piece of Emys weathering out of the clay. I checked the areas adjacent in case there was anymore associated material but unfortunately not. The bone fragment appears to be a rib. I reached Cranmore and collected some matrix for micro-sieving from the cliff face, and after collecting a few more bone fragments and coprolites, and with the tide now rising I called it a day and headed up to the main road. Overall it was a good collecting trip, with some good finds. Hopefully as the winter goes on the landslide debris is eroded away and some nice vertebrate remains are produced. Hope this was interesting, Theo 1. Huge piece of trionychid hypoplastron 2. 'Interior' view of the hypoplastron
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Tiny Fossils Record Big Shifts in Ocean Currents Minerals stored in microscopic fossils hint at the subtle ways ocean currents link far-flung food webs. by K. N. Smith, Hakai Magazine, January 3, 2018 https://www..com/news/tiny-fossils-record-big-shifts-in-ocean-currents/ Yours, Paul H.
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