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C a s t e l l a n a - B o r g h e t t o and Fabrica di Roma has been carried out at the
I n s t i t u t e of Mining Geophysics of the F a c u l t y Engineering of the Rome
University. Purpose of t h e survey was t o d e t e r m i n a t e en eventual connect
i o n between t h e two outcrops.
I t is reasonable t o conclude t h a t the connection does not exists. The
place of exit of t h e l a v a of Civita Castellana-Borghetto has been localized.
The results of a radiometric survey carried out in t h e same area are
also enclosed. Purpose of this survey was t o see if it is possible t o distinguish
a t the surface the tuff and the lava.
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