Lacasa-Marquina et al., 2014: IN SITU CONSERVATION STRATEGIES
Figure 4: The growth of the plant roots etches the surface and destroys the physical structure of the bone during the burial
(Shelton and Johnson, 1995).
Heinzelin, 1998; Sahnouni and van der Made,
2009).
The results of the environmental conditions
study suggest a climate defined by abrupt daily
and seasonal fluctuations of RH and T
parameters. The climate in this region is
continental
with
Mediterranean
tendency
characterized by severe conditions in winter,
with snow and frost persisting until spring
(Sahnouni, 1998). During 2012, the average RH
was 64%, the maximum 100%, and the
minimum of 10% on the 6
th of August at 4 pm.
Figure 5: Bottom side of the sedimentary pedestal after
Likewise, the average T recorded was 14.8 C,
flipping the jacketed block. The silt-clay matrix acts as a
the maximum came to 39.9 C on the 7
th of July
physical reinforcement and as a climate-buffering agent for
at 4 pm, and the minimum reached -9.1 C on
avoiding the effects of the rapid drying of the bone.
the 13
th of February at 7 am. The total RRR was
761 mm and the annual maximum value, 42
Based on Ain Hanech and El-Kherba published
mm, was recorded on 31
st of January at 7 am.
literature, the study and identification of agents of
The recorded daily data show that weather
deterioration during depositional and burial periods
during the fieldwork season (23
rd of June - 10th
allow us to infer that pre- and postdepositional
of July) was one of the driest and warmest
degradation factors would not be decisive to justify
periods throughout the year (Figure 6). The
the poor state of preservation of sub-fossil bones
average RH and T were 37.3% and 28.2 C
after unearthing them (Sahnouni, 1998; Sahnouni
respectively, and the RRR was almost negligible
et al., 2002, 2004, 2011, 2013; Sahnouni and de
(2.2 mm). The highest peak of T and lowest of
7
Journal of Paleontological Techniques