Roubach et al., 2014: PREPARATION OF TURTLE FOSSIL
was demarcated with a trowel, and then
(Figure 3). When the chemical reaction was
covered with aluminium foil. Then, a cardboard
finished and the polyurethane cold, the block
support was constructed in order to contain the
was extracted and turned upside down. The
sediment
block
and
polyurethane.
The
sediment of the underside was then also
polyurethane (polyol and isocyanate) was
covered with polyurethane.
mixed and poured inside the cardboard support
Figure 3: Turtle fossil (CN'10-Pit7/8-Niv11-M18-nš2). A) preservation state in situ; B-F) extraction process
featuring fossil protection (B-C), cardboard container fabrication (D) and polyurethane pouring (E-F).
Treatments in laboratory
(Figure 4A). The sediment was excavated until
the extents of the fossil were exposed (Figure
Excavation and cleaning
4B). Some of the bones presented cracks and
The preparation started on the upper part of
splits and were fragile (the superior and inferior
the fossil, by the removal of the polyurethane
parts of the fossil, and the cranium). Hence,
41 Journal of Paleontological Techniques