32
R. K. DELL
high arenaceous and a low calcareous foraminifera1 content passing over
the stations in which he had found high arenaceous contents, in order
to explain the distribution of foraminifera he had observed in the Ross
Sea. At the same time this current would have swept most planktonic
species out of the area. Pflum (1963) studied 10 surface core samples
from the Ross Sea. His results largely agreed with those of McKnight.
Blanc-Vernet ( 1965) described the distribution of Foraminifera
from nine samples from off Adelie Land, in depths from 10 to 270 m.
These samples fell into two groups, a shallow water fauna from 10 to
40 m and a deeper fauna from 180 to 270 m. A larger number of families
was represented in the deeper series. The family Trochamminidae
was much commoner in the shallower series, the genus Trocbmmina
(except for F. globigeriniformis) being largely confined to depths less
than 100 m. The families Textulariidae, Cassidulinidae and Buliminidae
seemed present in both series roughly in the same percentage. The
families Lagenidae , Polymorphinidae , Miliolidae and Silicinidae, well
represented in the deeper series were absent from the shallower group.
Bandy and Echols (1964) analysed all the data previously collected
on the Antarctic forms, including that presented by Uchio (1960) and
McKnight (1962). A careful examination of these existing records gave
the following zones for zonation of Antarctic benthic Foraminifera.
1. 200 (& 150) m.
Adercotryma glomerata (Brady)-Bulimina
aculeata group.
2. 500 (f 160) m. Cibicides wuellerstorfi (Schwagar)-Cyclammina
pusilla Brady group.
3. 1 000 (f200) m. Cyclammina orbicularis Brady group.
4. 2 000 (+200) m. Astrorhixa crassatina Brady group.
5. 2 400 (f600) m. Bulimina rostrata group.
Bandy and Echols present several useful tables giving bathymetric
ranges for selected index species. They also showed that some Antarctic species occur in different depths from those known for the same
species in other areas (heterobathyl species). For example Laticarinina
pauperata (Parker and Jones) occurs in the deep cold waters of the
Antarctic and in shallower warm waters in the Gulf of Mexico.
A major contribution to our knowledge of the ecology and distribution of Antarctic Foraminifera is Kennett’s (1968) study of Ross Sea
species. Based on 48 newly collected bottom stations and 60 earlier
samples spread more or less over the whole extent of the Ross Sea it
gave a wider geographical and bathymetric coverage of a restricted
area than had been available in Antarctic waters before. A total of
102 genera and 210 species were identified, and bathymetric distribu-
R. K. DELL
high arenaceous and a low calcareous foraminifera1 content passing over
the stations in which he had found high arenaceous contents, in order
to explain the distribution of foraminifera he had observed in the Ross
Sea. At the same time this current would have swept most planktonic
species out of the area. Pflum (1963) studied 10 surface core samples
from the Ross Sea. His results largely agreed with those of McKnight.
Blanc-Vernet ( 1965) described the distribution of Foraminifera
from nine samples from off Adelie Land, in depths from 10 to 270 m.
These samples fell into two groups, a shallow water fauna from 10 to
40 m and a deeper fauna from 180 to 270 m. A larger number of families
was represented in the deeper series. The family Trochamminidae
was much commoner in the shallower series, the genus Trocbmmina
(except for F. globigeriniformis) being largely confined to depths less
than 100 m. The families Textulariidae, Cassidulinidae and Buliminidae
seemed present in both series roughly in the same percentage. The
families Lagenidae , Polymorphinidae , Miliolidae and Silicinidae, well
represented in the deeper series were absent from the shallower group.
Bandy and Echols (1964) analysed all the data previously collected
on the Antarctic forms, including that presented by Uchio (1960) and
McKnight (1962). A careful examination of these existing records gave
the following zones for zonation of Antarctic benthic Foraminifera.
1. 200 (& 150) m.
Adercotryma glomerata (Brady)-Bulimina
aculeata group.
2. 500 (f 160) m. Cibicides wuellerstorfi (Schwagar)-Cyclammina
pusilla Brady group.
3. 1 000 (f200) m. Cyclammina orbicularis Brady group.
4. 2 000 (+200) m. Astrorhixa crassatina Brady group.
5. 2 400 (f600) m. Bulimina rostrata group.
Bandy and Echols present several useful tables giving bathymetric
ranges for selected index species. They also showed that some Antarctic species occur in different depths from those known for the same
species in other areas (heterobathyl species). For example Laticarinina
pauperata (Parker and Jones) occurs in the deep cold waters of the
Antarctic and in shallower warm waters in the Gulf of Mexico.
A major contribution to our knowledge of the ecology and distribution of Antarctic Foraminifera is Kennett’s (1968) study of Ross Sea
species. Based on 48 newly collected bottom stations and 60 earlier
samples spread more or less over the whole extent of the Ross Sea it
gave a wider geographical and bathymetric coverage of a restricted
area than had been available in Antarctic waters before. A total of
102 genera and 210 species were identified, and bathymetric distribu-