Roubach et al., 2014: PREPARATION OF TURTLE FOSSIL
the cleaning was carried out carefully with thin
with acetone: a cotton swab was soaked in
metallic and wooden awls, needles, and
acetone and was applied to the bone surface
brushes. The bones were subsequently cleaned
with a circular movement (Figure 4C).
Figure 4: Preparation process of the superior part. Excavation (A-B) and cleaning (C), fol owed by consolidation (D).
Consolidation treatments
laminations and cracks became larger with
During the drying process, the cracked, fragile,
time, affecteding the stability and anatomical
and friable bones were consolidated with
connection of the small bones (particularly the
Paraloid B72 at 5 to 15% in acetone (applied
phalanges located outside the body). Therefore,
with a syringe) (Figure 4D). The fractured
in order to control the sediment alteration,
bones were also joined with the same
consolidation tests were carried out by injecting
consolidant using higher concentration (50 %
different consolidants into the sediment cracks
up to 80%). In order to account for the fragility
(e.g. Beva 371 in 372 solvent). However, these
of the fossil, consolidation and cleaning were
tests were not fully conclusive and require
applied simultaneously.
further investigation. The alternative solution
During the preparation of the superior part, a
found to temporarily keep the small bones
serious problem was encountered:
the
articulated during the preparation process of
sediment altered when drying and presented
the fossil was to use paste filler (Modostuc) to
horizontal
lamination
and
cracks.
The
replace the sediment between the small bones.
42 Journal of Paleontological Techniques