Sito in Italiano !!
Sito in Italiano !!!

The Ara's base and table

The Ara's base: a particular

Next to Campo de Già doline we have found a great ara (cm 320 long, cm 220 wide and cm 60 of thickness) lozenge shaped and broken in three parts; it's above an inside hollow cylindrical shaped base (cm 80 of thickness) characterized by two symmetrical passer-by holes. This structure appears enigmatic in function and origin.

The petrographic analysis (Chiari R.) has allowed us to establish that this structure is made up of:

  • Ara's Base: medium Dolomite (62-250 micron), euedral/sub-planar. Normal (meteoric) dedolomitization along the fractures and on pressolution paragenesis (Chlorite-quartz-Pirrotite) = Dolomia Saccaroide (Portovenere's Unit).
  • Ara's Table: coarse  Dolomite (250-1 000 micron), euedral/planar, clear, luminescent. No dedolomitization.

The Base is made up by Dolomia saccaroide (rock outcropping on the Caprione) while the Table litotype don't have characteristics found in other promontory outcropping and probably it has an extra-Caprione origin.

 

A singular rock with hole

A singular rock with hole