Geology Reference
In-Depth Information
(1)
E. lacustris
cuticle
+
+
+
_
*
*
_
+
_
C
10
+
_
C
15
_
_
+
+
*
_
+
_
_
+
C
20
_
_
_
B3
_
_
(2)
P. Sarlei
cuticle
C
10
+
+
*
+
*
_
+
_
_
+
C
15
_
+
_
B3
_
+
+
*
_
20
_
+
_
_
_
_
+
(3)
E. dekayi
cuticle
*
*
+
+
+
C
10
_
_
+
_
C
15
_
_
+
_
+
*
+
_
_
_
_
2
+
_
_
+
_
Retention time
Fig. 7.3
Py-GC-MS analysis of eurypterids. Partial Py-GC-MS chromatogram of (
a
)
Eurypter-
uslacustris
, (
b
)
Pterygotussarlei
and (
c
)
E. dekayi
cuticles revealing the presence of dominant
aliphatic component as indicated by the homologues series of
n
-alkanes (+) and
n-
alkenes (−). B3:
trimethyl benzene, methyl ethyl benzene. C
n
indicates alkane and alkene homologue with n denot-
ing the carbon chain length. * contaminant from GC septum
living relatives. Aliphatic components may be overestimated by pyrolysis and NMR
studies (Poirier et al.
2000
) and other such structures as condensed aromatics that
may be structurally important in the fossil polymer may not be amenable to pyroly-
sis. It is diffi cult to obtain a suffi cient sample of fossil arthropod cuticle for
13
C
solid-state NMR studies so pyrolysis has been the preferred mode of analysis.
Search WWH ::
Custom Search