matgerke Posted August 16, 2016 Share Posted August 16, 2016 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! Link to comment Share on other sites More sharing options...
ynot Posted August 16, 2016 Share Posted August 16, 2016 Got pictures? Tony Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
doushantuo Posted August 16, 2016 Share Posted August 16, 2016 nah,who needs pix? Link to comment Share on other sites More sharing options...
CraigHyatt Posted August 17, 2016 Share Posted August 17, 2016 Definitely trilobite tracks from the look of them. Info: Craig Hyatt, retired software/electrical engineer Experience: Beginner, fossil hunting less than a year Location: Eagle Pass, TX USA on the border with Mexico, hot dry desert Formation: Escondido, Marine, Upper Cretaceous Materials: Sandstone, Mudstone, Shale, Chert, Chalk Typical: Thalassinoides, Sphenodiscus, Exogyra, Inoceramus Reference: http://txfossils.com/Txfossils.html Link to comment Share on other sites More sharing options...
doushantuo Posted August 17, 2016 Share Posted August 17, 2016 Rusophycus,Craig?or Cruziana?Does Cruziana range through to the Devonian? Questions,questions Might it not be an as yet unnamed ichnite,like nopixichnus? Link to comment Share on other sites More sharing options...
Quigi Posted August 17, 2016 Share Posted August 17, 2016 Definitely trilobite tracks from the look of them. Agreed, never seen 'em that big before though... Link to comment Share on other sites More sharing options...
doushantuo Posted August 17, 2016 Share Posted August 17, 2016 That scale is in metres? Link to comment Share on other sites More sharing options...
Quigi Posted August 17, 2016 Share Posted August 17, 2016 That scale is in metres? I'm not too sure, no markings...but sure is big! From what I've found from a Devonian sea bed is much smaller (found a few that were around a couple feet, but didn't want to drag them up the cliff). Link to comment Share on other sites More sharing options...
tmaier Posted August 17, 2016 Share Posted August 17, 2016 He appears to had a gamy leg. Also looks like he might be using a cane. Amazing what you can tell from traces! Link to comment Share on other sites More sharing options...
matgerke Posted August 17, 2016 Author Share Posted August 17, 2016 Oops, Forgot to attach. Link to comment Share on other sites More sharing options...
ynot Posted August 17, 2016 Share Posted August 17, 2016 They do look like trace fossils to Me. Tony Darwin said: " Man sprang from monkeys." Will Rogers said: " Some of them didn't spring far enough." My Fossil collection - My Mineral collection My favorite thread on TFF. Link to comment Share on other sites More sharing options...
matgerke Posted August 17, 2016 Author Share Posted August 17, 2016 ... Another photo... Link to comment Share on other sites More sharing options...
CraigHyatt Posted August 17, 2016 Share Posted August 17, 2016 I see those all the time, but I have no idea what causes them. When I look closely at the ones I find on sandstone slabs, they look like blobs of mud. Also, I am not sure whether these are positive or negative molds. One observation: notice how they are, on average, oriented in the same direction as if affected by a water current or flow. Info: Craig Hyatt, retired software/electrical engineer Experience: Beginner, fossil hunting less than a year Location: Eagle Pass, TX USA on the border with Mexico, hot dry desert Formation: Escondido, Marine, Upper Cretaceous Materials: Sandstone, Mudstone, Shale, Chert, Chalk Typical: Thalassinoides, Sphenodiscus, Exogyra, Inoceramus Reference: http://txfossils.com/Txfossils.html Link to comment Share on other sites More sharing options...
Quigi Posted August 17, 2016 Share Posted August 17, 2016 Oops, Forgot to attach. I would guess tube worms or worms, could be from the Devonian or later. Link to comment Share on other sites More sharing options...
Quigi Posted August 17, 2016 Share Posted August 17, 2016 I see those all the time, but I have no idea what causes them. When I look closely at the ones I find on sandstone slabs, they look like blobs of mud. Also, I am not sure whether these are positive or negative molds. One observation: notice how they are, on average, oriented in the same direction as if affected by a water current or flow. They're usually tube worms or worms of some sort from the Devonian or later...at least from what I know, which is limited Link to comment Share on other sites More sharing options...
piranha Posted August 17, 2016 Share Posted August 17, 2016 These appear to be consistent with the typical features of: Planolites. For comparison, here is an example from the Devonian of New York. Link to comment Share on other sites More sharing options...
Missourian Posted August 17, 2016 Share Posted August 17, 2016 I agree the surface was modified by currents. There appear to be many tool marks, including one impression that vaguely resembles Mucrospirifer. After the surface was covered by sediment (the material of the slab), some organism burrowed through, producing the feature that goes 'against the grain'. More on tool marks: https://en.wikipedia.org/wiki/Sole_markings Context is critical. Link to comment Share on other sites More sharing options...
doushantuo Posted August 17, 2016 Share Posted August 17, 2016 A lot of lithologies are the result of turbiditic sedimentation. examples showing the relationship with trace fossils: https://www.researchgate.net/profile/Paolo_Monaco/publication/257417872_Ichnocoenoses_in_the_Macigno_turbidite_basin_system_Lower_Miocene_Trasimeno_(Umbrian_Apennines_Italy)/links/54070f530cf23d9765a833ff.pdf https://www.researchgate.net/profile/Duncan_Mcilroy/publication/239920277_Ichnological_characterization_of_EoceneOligocene_turbidites_from_the_Gres_d'Annot_Basin_French_Alps_SE_France/links/542949c10cf2e4ce940c98ae.pdf Sometimes Paleozoic sediment aren't what they at first appear to be: a lot of Paleozoic bioherms are really "resedimented carbonate breccias". agreed:those are convex hyporelief Planolites.. Most straight (sub)horizontal burrows end up in that ichnogenus PLANOLITES: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0070920 Link to comment Share on other sites More sharing options...
erose Posted August 17, 2016 Share Posted August 17, 2016 Does anyone else see the crinoid in the lower third? Wishful thinking? I would say the parallel groves are current-formed and the ones going crossways are an ichno-fossil like Planolites. Link to comment Share on other sites More sharing options...
matgerke Posted August 18, 2016 Author Share Posted August 18, 2016 This chain is hilarious! Wish there was a crinoid here, but in person it doesn't really look like it. Thanks for all your help! Link to comment Share on other sites More sharing options...
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