Agglutinated Middle-Upper Eocene foraminifera in Jabal Hafit, Al ...

Agglutinated Middle-Upper Eocene foraminifera in Jabal Hafit, Al Ain area 21
The species has been recorded in mid-Tertiary rocks
of some Caribbean Sea (CUSHMAN & RENZ, 1941 in
Venezuela, CUSHMAN & STAINFORTH, 1945 in Trinidad)
and also North Atlantic region (BERGGREN & AUBERT,
1976).
It is recorded only in the early Late Eocene (P15) of Jabal
Hafit.
Superfamily Verneuilinacea CUSHMAN, 1911
Family Prolixoplectidae LOEBLICH & TAPPAN, 1985
Genus Plectina MARSSON, 1878
Type species : Gaudryina ruthenica REUSS, 1851
Plectina emiratensis ANAN, 2003
2003. Plectina emiratensis ANAN, p.534, fig. 4.2.
The species is characterized by its subconical and short
test, coarse-grained surface, subterminal and traverse
elongate slit aperture on the apertural face of the last
formed chamber.
This species occurs in the top Middle Eocene (P14) of
Jabal Hafit.
Family Tritaxiidae PLOTNIKOVA, 1979
Genus Tritaxia REUSS, 1860
Type species : Textularia tricarinata REUSS, 1844
Tritaxia alpina (CUSHMAN, 1936)
Pl. I, fig. 8
1936. Clavulinoides alpina CUSHMAN, p. 22, pl. 3, fig. 16.
1975. Tritaxia alpina (CUSHMAN).- PROTO DECIMA & de BIASE,
p. 91, pl.1, fig. 12.
The species was recorded by PROTO DECIMA & de BIASE
(1975) to range from Early to Middle Eocene of Possagno
section of Italy.
In this study, it is recorded only from the Late Eocene
(P15-P16) of Jabal Hafit.
Superfamily Textulariacea EHRENBERG, 1838
Family Eggerellidae CUSHMAN, 1937
Subfamily Dorothiinae BALAKHMATOVA, 1972
Genus Dorothia PLUMMER, 1931
Type species : Gaudryina bullata CARSEY, 1931
Dorothia nacataensis (WHITE, 1929)
Pl. I, fig. 9
1929. Textularia nacataensis WHITE, p. 31, pl. 4, fig. 2.
1978. Marssonella nacataensis (WHITE) - PROTO DECIMA &
BOLLI, p. 794, pl. 1, fig. 15c.
LOEBLICH & TAPPAN (1988, p. 169) noted that the biserial
stage of Dorothia is increasing very slowly in size, so
that test has nearly parallel sides and is circular in cross
section, while it is rapidly increasing diameter and
conical in Marssonella. Hence, it is related here to the
genus Dorothia.
The species was originally described from the Eocene
rocks of the Tampico Embayment of Mexico. It was
also recorded by PROTO DECIMA & BOLLI (1978) from the
Paleocene of southeast Atlantic DSDP Leg 40, west coast
of Africa.
In this study, the species is recorded in the top Middle to
Late Eocene (P14 - P16) of Jabal Hafit.
Genus Marssonella CUSHMAN, 1933
Type species : Gaudryina oxycona REUSS, 1860
Marssonella hafitensis ANAN, 2003
2003. Marssonella hafitensis ANAN, p. 535, fig. 4.3.
Marssonella hafitensis is recognized from the Upper
Cretaceous-Paleocene M. oxycona by its nearly equal
length and breadth test, coarse- grained wall and concave
terminal face.
The species is recorded from the top Middle to Late
Eocene (P14 - P16) of Jabal Hafit.
Family Textulariidae EHRENBERG, 1838
Subfamily Textulariinae EHRENBERG, 1838
Genus Textularia DEFRANCE, 1824
Type species : Textularia sagittula DEFRANCE, 1824
Textularia communis (dʼORBIGNY, 1826)
Pl. I, fig. 10
1826. Textilaria communis dʼORBIGNY, p. 263.
1955. Textularia communis (dʼORBIGNY).- ANSARY, p. 21, pl. 1,
fig. 8.
1992. Textularia communis (dʼORBIGNY).- CHERIF et al., p. 46,
pl. 1, fig. 7.
The species was recorded in the Upper Eocene rocks of
Egypt (ANSARY, 1955).
CHERIF et al., (1992) have recorded this species from
the Oligocene of Jabal Hafit, while it occurs in the top
Middle Eocene (P14/15) of the study section. The rare
found specimens are broken with missing initial part.
Textularia plummerae LALICKER, 1935
1935. Textularia plummerae LALICKER, p. 50, pl. 6, fig. 10.
1975. Textularia plummerae LALICKER.- PROTO DECIMA & de
BIASE, p. 91, pl. 1, fig. 6.
1989. Textularia plummerae LALICKER.- HULSBOS et al., p. 268,
pl. 1, fig. 7.