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organicvision — Time Reference
Published: 2016-12-18 10:15:50 +0000 UTC; Views: 271; Favourites: 29; Downloads: 0
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Description
In geology lichen can be used as an indicator for the time a stone has been in the same position.We would go to cemeteries to calibrate the growth rates of different species in our area using the dates on unpolished tombstones.
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Comments: 10
J'adore! ^^ c'est tout ce que j'aime quand je Visite un cimetière! ^^
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Il y a quoi faire à Genève
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tu veux dire que c'est une villle morte?
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That's interesting. I thought they're only the reference of SO2 pollution...
P.S. Sometimes they do grow on smooth surfaces. I've seen some growing on metal.
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They grow on almost any surface but not at the same rate and yes, there are some which are sensitive to pollution as well.
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Ici les gris clair font 1 cm de diamètre en 25 ans.
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C'est ça l'interet...
mais c'est peu de temps en géologie.
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