Geoscience Reference
In-Depth Information
PA LYNO.
BIOEVENTS
MEGASPORE/MESOFOSSIL SPECIES
KEY BIOEVENTS
C. thiergartii
-C
M. reticulatum
-C
N.gracilis/
senex
-C
U.
PLIENSB.
TILJE FM
H
K. quadrata, Trileites
sp. 3
C
2.8
Trileites
sp. 1
, Trileites
sp. 3-C
2.7
2.6
B. tylotus
K. quadrata
-C
B
2.5
Trileites
sp. 1
Trileites
sp. 3
-C
B. tylotus
increase
V. franconicus
E. troedssonii
-C
2.4
Q. anellaeformis
-A
2.3
A
Tr ileites
sp. 2
2.2
Tr ileites
sp. 2
Tr ileites
sp. 3
2.1
C. thiergartii
-C/A
T. fuscus
T. candoris
H. areolatus
B
U.
HETTANG.
K. quadrata
consist./C
H
A
COAL B
N. hopliticus,
H. areolatus
-C/A
B
COAL A
N. hopliticus
-C/A
H. areolatus,
N. hopliticus
-A
A
N. hopliticus
consist.
H
B. pinguis, V. utilis,
T.
cf.
T. pedinacron
B. tylotus
consist.
R. tuberculatus
-C
B
L. lundbladii
-C
B. reticuliferus,
H.
sp. cf.
H. rexargenteus
consist.
B. tylotus
diversity
Incr.
A
Verrutriletes
sp. 1
B. pinguis
'GREY BEDS'
unzoned
R.
penarth.
Ostracod influx:
R.wicheri,
R. penarthensis, D. major
L. RHAET
U. NORIAN
'RED BEDS'
LITHOLOGY KEY
Coal
Carbonaceous claystone
Claystone
Standstone
Fig. 5.
Megaspore/mesofossil biozonation scheme of the Åre Formation, Halten Terrace region, plotted against palynology and interpreted chronostratig-
raphy (from Morton,
et al
., 2009). Note that the entire Åre Formation is divided into two main reservoir zones in the regional scheme (Åre-1 Fm. and Åre-2
Fm.). This scheme cannot be compared straightforwardly with the Åre reservoir zonation scheme from the Heidrun Field but in-house biostratigraphy
studies confirm that the regional biozones can be correlated with the Heidrun field reservoir zones. The 'coal A' corresponds to the Mid-Hettangian Top
Åre 1 Coal Marker (see Fig. 4); Lowermost Sinemurian 'Åre 2.1' (Base of
K. quadrata
biozone) correlates to the Åre 3 Zone; Lower Pliensbachian Top Åre:
'Top Åre 2.8' corresponds to Top Åre 7 Zone in the Heidrun scheme (Fig. 4).
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