Roubach et al., 2014: PREPARATION OF TURTLE FOSSIL
Ninots site (Gomez-Merino et al., 2009), as well
as consolidation tests of macroflora (fossil
leaves), preserved as impressions in lacustrine
clays (López-Polín et al., 2009).
Turtles from the Camp dels Ninots site are
freshwater reptiles (Mauremys leprosa). The
species distribution consists of the Iberian
Peninsula and the Maghreb Region of north-
west Africa (Fritz et al., 2006). M. leprosa of
Camp dels Ninots constitute one of the oldest
record in Europe of these species (Gómez de
Soler et al., 2012).
MATERIAL AND METHODS
The turtle fossil (CN'10-Pit7/8-Niv11-M18-nº2)
was discovered at level 11 of the Can Argilera
sector (Figure 1B), during the 2010 excavation
campaign. The units covering the fossil were
greenish laminated clays with sandstones
(Figure 2).
The turtle fossil appeared complete and in
anatomical connection, with the posterior and
anterior phalanges located outside the body.
Such spatial disposition is a rare occurrence,
since in most recovered fossils the phalanges
are retracted inside the shell. This fossil is
therefore
very
interesting
to
document
precisely the anatomy of this species. However,
Figure 2: Detailed stratigraphy of the Camp dels Ninots site
bones presented splits, cracks, and were friable
(adapted from Gómez de Soler et al., 2012).
in some parts (particularly when the bone and
sediment were dry). It is noteworthy as well
that most of the fossils were flattened because
of diagenetic processes. As such, the turtle
A large range of
skeletons (mammals,
fossil was in need of an in-depth preparation in
amphibians, freshwater fishes, and reptiles)
situ and in the laboratory later on.
have been recovered, most of them articulated
(for more details, please see: Gómez de Soler
et al., 2012; Jiménez-Moreno et al., 2013;
In situ treatments
Campeny et al., 2012, 2013; Gómez de Soler
et al., 2014). In terms of flora, both pollen and
Excavation, cleaning and consolidation
macroscopic remains have been found. The
When the fossil appeared, the general surface
landscape
is
characterized
by
forested
was delimited with a small trowel and a brush.
vegetation (featuring a forest ratio between
Then, the bones were excavated superficially
57% and 97 %, based on pollen analysis;
from sediment and cleaned using wooden
Jiménez-Moreno et al., 2013). The correlation
and/or metallic instruments (like scalpels, awls,
of paleomagnetic and pollen results with the
etc.). The fragile bones were consolidated with
referred paleontological data gives the Camp
Paraloid B72 at 5 to 10% in acetone (applied
dels Ninots site a date ranging from 3.3 to 3.1
with a syringe).
Ma (with the sedimentary sequence deposited
in 200 kyr) (Gómez de Soler et al., 2012;
Extraction
Jiménez-Moreno
et
al.,
2013).
Previous
For storage and preparation purposes, the
published works report the conservation and
fossil was extracted in its sediment block with a
storage of a bovid skull from the Camp dels
polyurethane support. The surface to extract
40 Journal of Paleontological Techniques