Lacasa-Marquina et al., 2014: IN SITU CONSERVATION STRATEGIES
The use of nails and chisels is required to
weaken gradually and systematically the matrix
pedestal (Figure 13). Finally, after flipping the
jacketed block, the bone specimens are
wrapped and sealed with plastic film to keep
their RH unchanged and to ensure their safe
transfer to the field laboratory where they will
receive immediate proper treatments. Thus,
remedial conservation treatment were carried
out by the gradual removal of the temporary
packaging prepared at the site to prevent
condensation and to allow the slow loss of
humidity
until
reaching
balance
with
surrounding environment conditions (Figure
14). Finally, when necessary, consolidation and
reconstruction treatments are performed for
restoring the mechanical strength of treated
bone specimens and, thus, ensure their safe
transportation to their long-term storage
facility (Figure 15).
Figure 14: Field laboratory: gradual removal of the
matrix pedestal which is acting as a buffering agent of
RH. At this stage, the jacketing plaster system provides
structural support to the bone. The picture below shows
the calcium carbonate layer covering the specimen
surface while progressively drying until reaching an
environmental equilibrium.
Figure 15:
Restoration actions must keep intact taphonomic evidences. The structural reinforcement
comprises volumetric reintegration treatments. A mixture of its own sediment and cohesive materials such as
Paraloid B72
diluted in 10% acetone or 5 Minute Epoxi exceptionally use in specific heavy weight areas
is applied as a gap-filling material.
16
Journal of Paleontological Techniques