61. OSTRACODES—LEG 34 - Deep Sea Drilling Project · 61. OSTRACODES—LEG 34 D.R. Wall, Burmah...
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61. OSTRACODES—LEG 34 D.R. Wall, Burmah Oil and Gas (BOAG), P.O. Box 11279, Santa Rosa, California Patrick G. Quilty, West Australian Petroleum Pty. Limited (WAPET), G.P.O. Box C1580, Perth, Western Australia During preparation of foraminifera for another paper (Quilty, Planktonic Foraminifera, this volume), os tracodes were occasionally encountered and routinely separated. Fifty seven samples yielded ostracodes, usually only one or two specimens but rarely up to 11. It was hoped that a more detailed study could be made but time has prevented this. One author (D.R.W.) examined the specimens and identified them generically. Although time has made it impossible to carry the study further, it is considered worthwhile to present even this limited information because ostracodes from DSDP samples have received little attention. The faunas are generally sparse but well preserved and can be regarded as typical of the deep water environment, each genus having been previously described from abyssal depths (Table 1). Representatives of most forms are illustrated on the accompanying Plate 1 (photography by W.K. Copley of WAPET). Krithe is the dominant genus. This has been provisionally divided into three species, though with more detailed work further specific distinction may be warranted. Several good specimens of Echinocythereis, Bairdia, and Hermanites must be regarded as the "nearest generic fit" as the specimens show certain features slightly at variance with thegeneric diagnosis. The genus Cytheropteron is represented by a small number of specimens belonging to a few species. The identification of Pterygocythereis and Macrocypris must be regarded as provisional as they are based on a few juvenile specimens. TABLE 1 Distribution of Ostracodes From DSDP Leg 34 HOLE AGE CORE SPECIES^\^ Echinocythereis sp.l Krithe sp.l K.sp.2 Cytheropteron sp. 4 ? Krithe sp. Bαirdiα sp. Hermanites sp Cytheropteron sp.l Krithe sp. indet. Cytheropteron sp. 2 ? Pterygocythereis sp ? Echinocythereissp. Ostracoda indet. LEGEND R L 319 PLIOCENl 1 5,42-44 RP CVJ 3,101-103 Lm Rf rtlOCENE 4 2,83-85 Lt Rl Rj 5,42-44 L) Rj 6,100-102 Rj Right valve Left valve Middle 5 2,90-92 Lj 3,90-92 Rm Rj 5,90-92 Rj C f m 6,90-92 S Rj La o ü Ra 6 4,14-16 jfr 5,127-129 S c i Carapace female male Rfj 7 3,71-73 RLj S fr 4,85-87 Lj a j s 6,119-121 ca 8 3,145-140 Ra? 5,60-62 cp 6,50-52 Rf ü ü La adult (undiff.) juvenile several 9 1,118-120 Lf Rj 2,56-58 LRa P fr 3,48-50 Lf Rj o cj ! Early I0 1,92-94 Lp Rj Rj 3,58-60 S Rfr 4,125-127 S Rj ü ü La La II 1,122-124 C J Ljfr penultimate instar fragment 737
Transcript of 61. OSTRACODES—LEG 34 - Deep Sea Drilling Project · 61. OSTRACODES—LEG 34 D.R. Wall, Burmah...
61. OSTRACODES—LEG 34
D.R. Wall, Burmah Oil and Gas (BOAG), P.O. Box 11279, Santa Rosa, CaliforniaPatrick G. Quilty, West Australian Petroleum Pty. Limited (WAPET),
G.P.O. Box C1580, Perth, Western Australia
During preparation of foraminifera for another paper(Quilty, Planktonic Foraminifera, this volume), os-tracodes were occasionally encountered and routinelyseparated. Fifty-seven samples yielded ostracodes,usually only one or two specimens but rarely up to 11.
It was hoped that a more detailed study could bemade but time has prevented this. One author (D.R.W.)examined the specimens and identified them generically.Although time has made it impossible to carry the studyfurther, it is considered worthwhile to present even thislimited information because ostracodes from DSDPsamples have received little attention. The faunas aregenerally sparse but well preserved and can be regardedas typical of the deep-water environment, each genushaving been previously described from abyssal depths(Table 1).
Representatives of most forms are illustrated on theaccompanying Plate 1 (photography by W.K. Copley ofWAPET). Krithe is the dominant genus. This has beenprovisionally divided into three species, though withmore detailed work further specific distinction may bewarranted. Several good specimens of Echinocythereis,Bairdia, and Hermanites must be regarded as the"nearest generic fit" as the specimens show certainfeatures slightly at variance with the generic diagnosis.The genus Cytheropteron is represented by a smallnumber of specimens belonging to a few species. Theidentification of Pterygocythereis and Macrocypris mustbe regarded as provisional as they are based on a fewjuvenile specimens.
TABLE 1Distribution of Ostracodes From DSDP Leg 34
HOLEAGE
CORE
SPECIES^\^
Echinocythereis sp.lKrithe sp.lK.sp.2Cytheropteron sp. 4? Krithe sp.Bαirdiα sp.Hermanites spCytheropteron sp.lKrithe sp. indet.Cytheropteron sp. 2? Pterygocythereis sp? Echinocythereis sp.Ostracoda indet.
LEGENDR
L
319PLIOCENl
1
5,4
2-4
4
RP
CVJ
3,10
1-10
3
LmRf
rtlOCENE
4
2,8
3-8
5
Lt
RlRj
5,4
2-4
4
L)Rj
6,1
00
-10
2
Rj
Right valve
Left valve
Middle
5
2,9
0-9
2
Lj
3,9
0-9
2
RmRj
5,9
0-9
2
Rj
C
fm
6,9
0-9
2
S
RjLa
oü
Ra
6
4,1
4-1
6
jfr
5,12
7-12
9
Sci
Carapace
female
male
Rfj
7
3,7
1-7
3
RLjS
f r
4,8
5-8
7
Lj
a
js
6,11
9-12
1
ca
8
3,14
5-14
0
Ra?
5,6
0-6
2
cp
6,5
0-5
2
Rf
üü
La
adult (undiff.)
juvenile
several
91,
118-
120
Lf
Rj
2,5
6-5
8
LRa
Pfr
3,4
8-5
0
Lf
Rj
o
cj
! Early
I0
1,9
2-9
4
Lp
Rj
Rj
3,5
8-6
0
S
Rfr
4,12
5-12
7
S
Rj
üü
La
La
II
1,12
2-12
4
CJ
Ljfr
penultimate instar
fragment
737
D. R. WALL, P. G. QUILTY
HOLEAGE
CORE^ \ S E C T I O N }
^^^DEPTHSPECIES^^L
Krithe sp. 3K. sp. 1K. sp. 2Echinocythereis sp.lHermαnites sp. 1? Krithe sp.? Mαcrocypris sp.? Echinocythereis sp.2Krithe sp.Cytheropteron sp. 3C. sp.Bαirdiα sp.Ostrαcodα indet.
TABLE 1
Early MIOCENE
II
2,3
0-3
2
ca
3,5
0-5
2
Lf
4,3
3-3
5
RiLmjS
Rm
6,6
6-6
8
Rm
fro
üo
LjRiLj
12
1,12
4-12
6
Lj
fr
2,4
0-4
2
fr3,1
00-1
02
Ra
oü
Ra
Rj
— Continued
320QUAT.
1
!O
S
2,5
1-5
3
S
Early
2
1,8
0-8
2
Rmj
S
oü
fr
MIOCENE
3
1,10
5-10
7
Rm
fr
2,2
7-2
9
RiS
Ri
La
LRj
3,1
0-1
2
Ra
Lp
fr
4,6
-8
Ra
5,
14-1
6
RiSLj
6,
131-
133
SS
La
fr
oo
SRL)
EarlyMIOCENE
1
2,5
-7
LjLRj
oo
LRj
LjR)
320 BOLIGOCENE
2
1,5
4-5
6
Re j
2,1
0-1
2
LRf
Lf?La?
3,5
0-5
2
Ra
Ra
4,3
0-3
2
S
5,3
5-3
7
Ri
JC
oo
SRjRLj
Ljfr
Rj
PLATE 1Representatives of most ostracode forms, Leg 34,
Deep Sea Drilling Project
Figures 1,2 Krithe sp. 1; 319-11-3, 50-52 cm.1. ×50.
Figures 3, 4 Krithe sp. 1; female carapace; ×45; 319-5-6, 90-92cm.
Figures 5, 6 Krithe sp. 2; 319-5-2, 90-92 cm.5. ×80.6. ×IOO.
Figure7 Krithe sp. 3; ×35; 319-11-2, 30-32 cm.
Figures 8, 9 Bairdia sp.; ×60; 319-8, CC.
Figures 10, 11 Hermanites sp.; ×40; 319-8-5, 60-62 cm.
Figure 12 Echinocythereis sp.; ×45; 319-1-5, 42-44 cm.
Figures 13, 14 Pterygocythereis sp.; 319-10-4, 125-127 cm.13. ×60.14. ×70.
Figures 15, 16 ?Macrocypris sp.; 319-12, CC.15. ×80.16. ×90.
Figures 17, 18 Cytheropteron sp. 1; 319-8-6, 50-52 cm.17. ×35.
18. ×50.
Figures 19,20 Cytheropteron sp. 2; ×35; 319-10, CC.
Figure21 Cytheropteron sp. 3; ×55; 320-3-2, 27-29 cm.
Figures 22, 23 Cytheropteron sp. 4; 319-5-6, 90-92 cm.22. ×35.23. ×40.
738
OSTRACODES
PLATE 1
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