Posts: 844
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Posted Aug 22, 2009, 09:59:26 AM |
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found in southern North dakota by a friend embedded in the side of a high badlands type bluff in a layer near the top of a high bluff maybe 150 feet high what are they?  ? |
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Posts: 446
austin,texas
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Reply To This Topic #1 Posted Aug 22, 2009, 11:02:27 AM |
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They look like small pods from Invasions of the Body Snatcher's
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Posts: 62
Upper Cretaceous of Texas
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Reply To This Topic #2 Posted Aug 22, 2009, 04:40:50 PM |
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Hi Larson
They are geologic in origin. Down here we call them "mudstone" or "ironstone" concretions. Just cool geology!
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Regards,
John
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Posts: 844
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Reply To This Topic #3 Posted Aug 22, 2009, 11:57:42 PM |
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thanks tylocidaris,how are they formed and what are concretions
once again, thanks much
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Posts: 45
Houston, TX USA
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Reply To This Topic #4 Posted Sep 04, 2009, 09:19:39 AM |
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Concretions---sometime an object (sometimes an animal that becomes fossilized inside) begins to collect material on its surface as a snowball rolling down a hill. Material clings to the "core" and eventually lithifies, creating what you see. Some concretions can be broken open with a hammer and chisel or freeze-thaw shock method and fossils or crystals can be found inside. Some have nothing, some may have pyrite or apatite/calcite or even a fossil such as a fossil crab.
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I collect: Indian Artifacts, Coins from all eras, fossils, minerals, old diecast cars, old and new guns/knives, civil war bullets, etc.!
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Posts: 844
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Reply To This Topic #5 Posted Sep 09, 2009, 11:07:59 AM |
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thanks silver, the info is appreciated
if you have any more to add I would thank you for that
once again thanks
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Reply To This Topic #6 Posted Sep 24, 2009, 12:57:42 PM |
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Could just be concretions, but the Dakotas are known for thier fossilzed dinosaur eggs.. I'd have em checked out
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TUFF DIGS ARE GOOD DIGS!!!! Posts: 946
ILL
Detector used: Minelab Safari, bounty hunter 202 with a 10in magnum coil, Automax pinpointer,
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Reply To This Topic #7 Posted Oct 06, 2009, 09:03:19 AM |
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the egg my 1st thought on 1 or 2 of emm... neat finds. MR TUFF
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oldest coins dug. 1851 seated dime. 1879s Morgan. 1928s walker. 1887x2,1906 V nickle. 1915 Buff. 1874,1881,1882,1883,1889x3,1890,1891,1893,1895,1897,1898x3,1901x2,1902x3,1904,1907,1908,1909 IHs. 1902,1906 barber Qtrs. 1894o,1897,1899,1904,1905s,1909,1913 barber dimes. merc 1916.
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Reply To This Topic #8 Posted Oct 21, 2009, 02:29:59 AM |
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thats some pretty cool stuff.to bad i wasent hunting back when i lived in ND
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I AM BEUWULF Posts: 24
VA/MD
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Reply To This Topic #9 Posted Oct 24, 2009, 03:32:17 PM |
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Hello, larson 1951; I am not a geologist but the rock looks like a type of earthy hematite, reddle perhaps. It is /was used as a pigment and a polish. You might check to see if a metal detector can see it, if it can not it still does not exclude it from being hematite, it just has a lower iron content. Also it oxidizes or rust readily once exposed.  |
"They say you have a monster here. They say - your lands are cursed"
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Reply To This Topic #10 Posted Nov 10, 2009, 09:13:45 PM |
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larson...they are sidderite nodules. they are mostly iron. very cool looking!
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Posts: 2702
Northwest Missouri
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Reply To This Topic #11 Posted Nov 10, 2009, 09:19:55 PM |
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You can google "septarian nodules" also and see some similar examples.
HH Charlie
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