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Autor Thema: blue flint  (Gelesen 1564 mal)

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Offline Richard84

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blue flint
« am: 19 Aug 14, 16:18 »
This is a common flint type at some locations in central and northern Poland, found as an erratic boulder (Geschiebe of German authors) in postglacial sediments. The only fossils I keep finding in them are Bryzoza (last photo). The color is blue, not well represented on the photos below. Can you point to their age and presume source in the North?
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Offline Vega

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Re: blue flint
« Antwort #1 am: 29 Aug 14, 21:02 »
60 - 90    Millionen Jahre  Alt     

 The Blue is  from  Flint ->   Chalcedon ..   


look on this side
  near  your  Found   loaction  ..

http://www.museum-albersdorf.de/flintfossil/flint-zeit.htm

« Letzte Änderung: 29 Aug 14, 21:08 von Vega »
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Offline Sprotte

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Re: blue flint
« Antwort #2 am: 24 Sep 14, 16:05 »
The blue colour of such erratic boulders of flint is not related to the original colour which is gray in most cases but results from patination due to long-term exposure on the surface. Such blue-coloured flint boulders are very common in northern Germany too.

Best regards
Sprotte (northwestern Mecklenburg, Germany)
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Offline Sprotte

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Re: blue flint
« Antwort #3 am: 24 Sep 14, 16:14 »
The flint boulder No. 3 may be from Danian (about 62-66 million years old) due to scores of bryozoans.

Best regards
Sprotte
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