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