The research programmed for 2015 was substantially reduced due to the lack of funding. For this reason, only one sondage was opened in a peripheral area south-east of the preceding palaeontological excavations. Prior to the excavation, a survey was carried out to identify the area for the trench, with the aim of finding other outcrops of the Bartonian (middle-upper Eocene) period that were later, and in stratigraphic sequence with the spiculite that terminated the sequence excavated in 2014. The sondage was positioned at a point where Eocenic calcareous detritus was present on the surface.

The excavation of sondage S1 exposed the following stratigraphy:
From the ground surface to -0.40 m, hazelnut coloured silty agricultural soil with calcareous clasts measuring from a centimetre to tens of centimetres;
from -0.40 m to -0.65 m light brown silty soil, slightly clayey with calcareous clasts measuring from a centimetre to tens of centimetres;
from -0.65 m compact, pinkish hazelnut coloured volcanoclastic rock.
Given the negative results from sondage S1, it was decided to open another one (S2) close by but at a slightly higher level. The excavation was halted for technical reasons before reaching the rocky substratum. The following stratigraphy was recorded:
from the ground surface to -0.45 m hazelnut coloured silty agricultural soil with calcareous clasts measuring from a centimetre to tens of centimetres;
from -0.45 m to -0.85 m light brown silty soil, slightly clayey with calcareous clasts measuring from a centimetre to tens of centimetres.
No palaeontological finds, not even fragments, were recovered from the excavations.