Roubach et al., 2014: PREPARATION OF TURTLE FOSSIL
the fossils during transport and short time
adhesive at the same time minimizes the
storage; this method of extraction also allows
number of products applied, leading to a better
maintaining the sediment humidity, leading to
control on the paleontological preparation
much easier laboratory work.
process. Paraloid gives good results in the
We used Paraloid B72 for all preparation
bones preservation, and the good preparation
processes because of its stability and efficiency
of the fossils allows manipulating them for both
(Howie, 1984; Horie, 1987; Johnson, 2001).
study and exhibition.
The use of one product as consolidant and
Figure 9: Cast process. A-B) resin preparation; obtained replica during (C) and after (D) painting.
With laminate materials such as the sediment
during the preparation. The main advantage of
found in the Camp dels Ninots site, it is very
3D scanning is that it is a non destructive
difficult to keep the bones articulated. Another
technique, which can be applied even on very
way could be to use the so-called Transfer
fragile materials. It is also relatively fast, easy
method (Schaal, 2005). It consists in the
to use, can be used in situ (portable
preparation of one side of the fossil, which is
apparatus), and does not require physical
then covered with artificial resin. After
storage space. Its main drawbacks are the lack
hardening of this artificial substrate, the other
of precision especially in the angled parts of the
side of the specimen is prepared. However, the
fossil, and the high price of the apparatus. On
reversibility would be sacrificed in that case.
the other hand, Silicon molding is a more
Without a reversible procedure to maintain
established technique and is more precise than
articulation, it was decided to dislocate the
3D scanning under its current form. However, it
small bone extremities. That decision led to the
is a much slower and potentially dangerous
use of the 3D scanning technique to document
technique on fragile fossils such as the one
the original features of the fossil before and
considered in this work. It requires the use of
47 Journal of Paleontological Techniques