Geology Reference
In-Depth Information
a
Montsechia
5 mm
_
_
_
10
_
_
_
_
15
_
_
+
+
+
+
+
+
_
20
_
+
+
+
+
_
B2
_
+
+
P2
_
P
+
+
P1
_
25
+
_
_
+
+
Retention time
b
Austrapotamobius
5 mm
B
2
*
10
_
_
P1
P2
_
_
_
_
_
P
+
+
+
_
20
+
+
+
_
+
+
_
+
_
_
+
+
+
+
Retention time
Fig. 11.6
Partial ion chromatogram of pyrolysis-GC-MS analysis of (
a
) fossil plant
Montsechiavidali
and (
b
) fossil decapod
Austrapotamobius. Figure symbols
same as in Fig.
11.4
EDX analysis of the plant
Montsechia
(LH-50.082, Fig.
11.6a
) showed that it
consists mainly of C, O and S, with some Ca, a similar composition to the organically
preserved fi sh eye (LH-50.087). The surface is granular with associated fi lamentous
structures and sediment grains. Py-GC-MS of the fossil plant also showed an
aliphatic composition (Fig.
11.6a, C
9
to C
25
) as commonly observed in fossil
plants with no preservation of original lignin, polysaccharides or the structural
polyester cutin. Analysis of fossil decapod (Fig.
11.6b
) revealed an aliphatic
component from C
9
to C
21
with benzene and phenol derivatives.
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