thair Posted November 21, 2014 Share Posted November 21, 2014 I am posting this even though I don't think it is a "fossil". This is from the Wilson Clay Pit in Coleman County. There are some unusual mineral deposits that are found at the site but this is different than what I have seen before. It is iron type deposit but looks like it was deposited in a molten state. almost like squeezed out of a tooth past tube? Just want y'all thoughts. Link to comment Share on other sites More sharing options...
Auspex Posted November 21, 2014 Share Posted November 21, 2014 I certainly looks like an extrusion, and I want to suggest coprolite. Does it seem to be siderite or limonite? "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
FossilDAWG Posted November 21, 2014 Share Posted November 21, 2014 I think I'd pass on the Skippy test* on those. Don * "Skippy test" = lick them Link to comment Share on other sites More sharing options...
caldigger Posted November 21, 2014 Share Posted November 21, 2014 Geez Don, it's not like they would still hold their flavor! Come on, go ahead and lick it!!! Link to comment Share on other sites More sharing options...
Carl Posted November 21, 2014 Share Posted November 21, 2014 I doubt it's a coprolite - I agree that it looks like some kind of ironstone. Link to comment Share on other sites More sharing options...
thair Posted November 21, 2014 Author Share Posted November 21, 2014 I certainly looks like an extrusion, and I want to suggest coprolite. Does it seem to be siderite or limonite? Not that up on minerals but it is hard, heavy and very dense. Limonite or Hematite? Link to comment Share on other sites More sharing options...
caldigger Posted November 21, 2014 Share Posted November 21, 2014 Limonite given the color Link to comment Share on other sites More sharing options...
painshill Posted November 21, 2014 Share Posted November 21, 2014 (edited) You can only really tell from the streak colour, not the surface colouration. Hematite streaks bright to dark red. Limonite streaks yellowish-brown. Siderite has a colourless streak which may be "dirty" from iron oxides. Edited November 21, 2014 by painshill Roger I keep six honest serving-men (they taught me all I knew);Their names are What and Why and When and How and Where and Who [Rudyard Kipling] Link to comment Share on other sites More sharing options...
DPS Ammonite Posted June 4, 2016 Share Posted June 4, 2016 Here are some similar heavy hematite rich concretions found near iron mineral replaced wood at Wilson Clay Pit in Texas. Does anyone know if they might be a fossil, coprolite? There is no evidence of shells or bones in the masses that are 6cm tall. My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
doushantuo Posted June 4, 2016 Share Posted June 4, 2016 I seem to detect a spiral in the last pictures,which could point in the direction of coprolites Link to comment Share on other sites More sharing options...
DPS Ammonite Posted June 4, 2016 Share Posted June 4, 2016 It is not clear whether the rings spiral or are stacked. Most rings can only be followed about 90% of the way around the concretion before they pinch out. I thought for a short while that they might be highly distorted pith casts of calamites. Coprolites make more sense. My goal is to leave no stone or fossil unturned. See my Arizona Paleontology Guide link The best single resource for Arizona paleontology anywhere. Link to comment Share on other sites More sharing options...
doushantuo Posted June 4, 2016 Share Posted June 4, 2016 (edited) I'm trying to scare up some ferruginization literature,here goes with some of the results: http://www.kirj.ee/public/va_ge/geo-2006-4-2.pdf http://archive.li.suu.edu/docs/ms130/AR/chan3.pdf http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.586.7696&rep=rep1&type=pdf http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.587.6169&rep=rep1&type=pdf Edited June 4, 2016 by doushantuo Link to comment Share on other sites More sharing options...
Piotr Bajdek Posted June 8, 2016 Share Posted June 8, 2016 Thair, DPS Ammonite, I'm not really convinced that these are coprolites: no inclusions, no evident fecal morphology, or phosphatic mineral composition (1). In theory, these specimens might be some kind of bromalites (1,2), but they could be just concretions, whatever. (1) http://www.thefossilforum.com/index.php?/topic/65536-turtle-coprolite/?view=findpost&p=686965 (2) http://www.thefossilforum.com/index.php?/topic/53388-the-inside-of-nj-cretaceous-coprolite/?view=findpost&p=686681 PaleoBiology Blog (in English, Spanish, and Polish) Link to comment Share on other sites More sharing options...
sixgill pete Posted June 8, 2016 Share Posted June 8, 2016 I certainly looks like an extrusion, and I want to suggest coprolite. Does it seem to be siderite or limonite? They certainly do look like they are ready to be extruded. Kind of like the rubber that comes out of a gear pump that is heading into the extruder. But, I degress back to work; aaaaahhhhhh. My first impression without knowing what they are composed of would be coprolites, but?? Bulldozers and dirt Bulldozers and dirt behind the trailer, my desert Them red clay piles are heaven on earth I get my rocks off, bulldozers and dirt Patterson Hood; Drive-By Truckers May 2016 May 2012 Aug 2013, May 2016, Apr 2020 Oct 2022 Link to comment Share on other sites More sharing options...
CraigHyatt Posted June 8, 2016 Share Posted June 8, 2016 It would be interesting to open one. Not much help if they are casts, but if they aren't the internal structure might help identify 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...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now