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Stromatolites?


Napoleon North

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Hard to tell from your photo, but unlikely. This appears to have regular banding of the style thick&dark, thin&pale, repeat. It's likely inorganic in origin. As a rough guide, stromatolitic fabrics are subtly uneven and vary through the 'height' of the specimen

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No, what you have there is a weathered sedimentary rock. Here is a good example of what stromatolite layers look like:

post-14411-0-87589000-1400617200_thumb.jpg

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