Roubach et al., 2014: PREPARATION OF TURTLE FOSSIL
Figure 6: Silicon mould fabrication and preparation process for the fossil superior part.
removed from the fossil. The turtle fossil was
cleaning and consolidation was applied, using
protected by a separator spray (Molykote). The
the same instruments (metallic and wood awls,
jacket was put again on the fossil and the
needles,
brush)
and
products
(acetone,
silicone (Silastic 3481/curetting agent 81- 5%)
Paraloid B72 at 5, 10 and 80 % in acetone)
poured slowly inside the plaster jacket through
as for the superior part (Figure 7).
one of the two holes formed by the plasticine
When the preparation of the inferior part of the
posts (Figure 6).
fossil turtle was finished, the 3D scan
Once the silicon dried, the mould was turned
(Figure 5C) and silicon mould of this part
over and the inferior side of the turtle fossil
(Figure 8) were carried out using the methods
excavated. The same process of excavation,
applied for the superior part.
44 Journal of Paleontological Techniques