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In-Depth Information
Sediment associated with fossil weevil
a
21
16
13
Pr1
Pr2
10
25
B2
B3
B
4
30
b
17
Pr2
19
13
15
24
11
Pr1
30
24
m/z
74+87
26
22
6
16
20
18
8
12
28
14
10
Retention time
Fig. 4.8
(
a
) Partial py-GC-MS total ion current chromatogram of sediment associated with fossil
weevil. Peak labels are the same as in Fig.
4.4
. (
b
) Partial TMAH/Py-GC-MS total ion current
chromatogram of sediment associated with fossil weevil. Peak labels are the same as in Fig.
4.4
.
The
m
/
z
74 + 87 mass chromatogram reveals the distribution of fatty acid methyl esters, FAME ();
the C
24
and C
26
components are the most abundant (cf. Fig.
4.7
thermochemolysis of fossil weevil
where the acid distributions are different)
C
22
, C
24
and C
26
, are the most abundant, and the C
14
to C
28
FAME are characterized
by an even-over-odd predominance. In the TMAH pyrolysates, the
n
-alkane/
n-
alk-
1-ene homologues range from C
9
to C
30
and are more abundant than adjoining
FAME (except the C
27
and C
29
n
-alkane/
n
-alkene homologues).
Structural and Molecular Preservation
The plant gross morphology is not exceptional for compression fossils, and the
plants are incomplete. The plant surfaces are largely obscured by diatom impres-
sions, which also occur on some of the weevils from the site. The diatoms are
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