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731 Views 5 Replies Last post: Nov 13, 2013 8:22 PM by MikeHardman RSS
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Sep 30, 2013 9:34 PM

what grew on the shred? can one date it?

I found a pottery shred on the beach near the ancient port DOR (eastern mediterraenian) .

What is it that grew on it? (the marks are of mm ruler) ? how fast does it grow? can one estimate from the size for how long was the shred in the particular position that allowed this growth?

 

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    Oct 9, 2013 8:20 AM (in response to akiva)
    Re: what grew on the shred? can one date it?

    This looks typical of fossilised coral to me. There is a lot of this around the red sea resort of Sharm el Shiek where an earth quake caused the land to rise a few thoasand years ago and left the coral reefs high and dry. I have also seen similar coral in the UK but from Millions of years ago.

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    Nov 7, 2013 7:01 PM (in response to akiva)
    Re: what grew on the shred? can one date it?

    It must surely be coral, but being on pottery (even if a few 1,000 yr old), surely not actually fossilised? Given that you say it's on a beach (I assume a modern one), then if the species is around today it shouldn't take long.

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      Nov 7, 2013 7:58 PM (in response to rhossilian)
      Re: what grew on the shred? can one date it?

      Yes, it is modern coral.

       

      Rate of growth is affected by several factors: water termperature and motion, light levels, nutrient levels, symbiosis, the particular coral species, etc.

      In favourable conditions, coral can grow 20cm in a year

      How old is your particular piece of coral? Well it is younger than the piece of pottery, sure. But it is probably a matter of a few years. You might be able to see periodic (perhaps annual) growth lines.

       

      Here's a very useful primer on corals

      - http://krupp.wcc.hawaii.edu/BIOL200/powerpnt/corlanat/sld001.htm

      (see especially slide 34)

       

      Mike

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