Lacasa-Marquina et al., 2014: IN SITU CONSERVATION STRATEGIES
surrounding context as a consequence to their
or minimize the effects of the abrupt drying of
hygroscopic abilities ­ cause the degradation of
bones caused by extreme variations in climatic
the El-Kherba vertebrate sub-fossils.
values during their transfer from soil to air
settings, and are also intended to reinforce
their physical structure. This means that,
CONSERVATION STRATEGIES
analyzing local climate allows to establish
precautionary rules during fieldwork in order to
The conclusions of the study on the dynamic
prevent the exposure of bones to extreme
degradation of sub-fossil remains within the
conditions
or
rapid
fluctuations
of
RH
sedimentary context, and the identification of
parameters: 1) to refrain from retrieving bones
the real and potential degradation risk factors,
during the driest interval of the day (1 pm ­
have constituted the basis for defining
4
.pm), 2) to abstain from extracting bones
conservation
strategies.
Likewise,
the
during elongated time, 3) to avoid leaving the
implementation of treatments was carried out
bones overnight in situ so as to prevent
under the principle of minimal intervention and
potential degradation caused by sharp daily
non-interference
with
future
analytical
variations.
techniques.
The remedial conservation treatments carried
The
preservation
plan
includes
remedial
out at the site consist of implementing rigid
conservation and restoration measures and
jacketing techniques allowing the treated bone
actions, as a first step for medium and long
specimen to be lifted as a whole and to
terms
implementation
of
preventive
maintain its anatomy and its original spatial
conservation
treatments.
Remedial
disposition (Shelton and Johnson, 1995; Pedeĺ
conservation guidelines are intended to arrest
and Pulga, 2002; Leiggi and May, 1994;
Figure 10: Rigid jacketing technique used for the extraction and transport of the sub-fossil sample from the site to
the field laboratory.
13
Journal of Paleontological Techniques