Lacasa-Marquina et al., 2014: IN SITU CONSERVATION STRATEGIES
covered by a medium hardness layer of calcium
carbonate. Over this layer, or directly in contact
The results of the organoleptic analysis on the
with the bone, a compact silt-clay sediment
state of preservation of the studied sample
matrix with prismatic structure encased the
present a general degradation stage defined by
specimens (Figure 5). The quality of the state of
physical damage such as perpendicular and
preservation of the bone surface depends on
parallel breaks (Figure 2); split line cracks
the presence of the calcium carbonate layer and
(Figure 3); exfoliation and delamination of the
on the anatomical part represented. For
cortical surface, distortion, loss of external
example, generally teeth and metapodials are in
surface, and presence of roots (Figure 4).
a better state of preservation than ribs.
Likewise, the majority of sub-fossils were
Figure 2: Surface and structural bone damage defined by perpendicular and parallel breaks due to fossil diagenetic agents.
Figure 3: Structural weaknesses of a teeth sample caused by split line cracks occurring during the burial period.
Journal of Paleontological Techniques