Lacasa-Marquina et al., 2014: IN SITU CONSERVATION STRATEGIES
Laborde, 1986). These techniques act as a
evaporation. Once this is done, the plaster
structural reinforcement, as a buffering agent
jacketing systems prepared by several
of RH and T, and as a proper first packaging
perpendicular and parallel layers of plaster
layer,
which
is
an
essential
part
of
hydrophilic
cotton
bandages,
Hartmann
transportation methods for transferring the
Platrix
. are used for extracting the sub-fossil
remains from the archeo-paleontological site to
remains as they provide sufficient rigidity and
the
field
laboratory
(Figure
10).
The
adhere nicely to the morphology of each bone.
appropriate jacketing systems are selected by
The small amount of plaster contained in the
the size and weight of treated specimens and
bands allows the heat input of the curing
their structural stability. The procedure involves
process to be almost insignificant, thus not
keeping the sediments and the calcium
interfering with its role as a buffering agent.
carbonate
layer
covering
the
sub-fossil
However, it is essential to use previously
remains, taking into account the morphology of
thermal
insulator
(aluminum
foil)
as
a
each sub-fossil (Figure 11) and creating a
separator to protect the sub-fossils from
pedestal for preserving each bone in its
wetness and resultant increased humidity, as
sedimentary matrix. The dimension of the
well as a barrier from moisture and heat input
pedestal should be equivalent to twice the
from the plaster bandage (Figure 12). In the
width of the bone and 10 cm in depth below
case of fragile remains of medium-high volume
the estimated thickness of the remains. This
and weight, a partial or full reinforcement
helps to improve the maintenance of RH and
measure is needed using hydrophilic cotton
provides resistance to the prismatic structure of
bandages and Paraloid B72
diluted in 10%
the silt and clay matrix. During the excavation
acetone applied by brush. At this stage of the
process, the exposed bones should be covered
extraction process, the bottom of the jacketed
with polyethylene opaque sheeting to avoid the
block needs to be defined before undercutting
climatic direct effects and the risk of sudden
the pedestal from the in situ rock.
Figure 11: Excavation method is carried out following the natural stratigraphic layers until the bone is isolated on a matrix
pedestal. Its position in the stratigraphic section hinders its accessibility at the moment of the extraction.
14
Journal of Paleontological Techniques