Smaller Foraminifera From Guam - USGS

Significant benthonic Foraminifera in the Miocene samples of
the Janum Formation Continued
Species
Nodosaria insecta
Schwager.
Nodosaria skobina
Schwager.
Orthomorphina fijiensis
(Cushman).
Orthomorphina perversa
(Schwager).
Osangularia culter (Parker
and Jones).
Pleurostomelia alternans
Schwager.
Pleurostomelia brevis
Schwager.
Pyrulina labiata
(Schwager).
Siphogenerina striata
(Schwager).
Stilostomella verneuili
(d'Orbigny).
Vulvulina spinosa
Cushman.
SMALLER FORAMINIFERA FROM GUAM 111
Reported occurrences elsewhere
Miocene of Kar Nicobar and Java;
late Miocene and early Pliocene
of Borneo; Tertiary of Japan.
Miocene of Kar Nicobar.
Pliocene of Fiji.
Miocene of Kar Nicobar; Miocene of
Jamaica; Oligocene of Cuba;
Pliocene of Italy.
Miocene of Kar Nicobar; Eocene,
Oligocene, and Miocene of Sai-
pan; Eocene of Mexico and Cali­
fornia ; middle Eocene to lower
Oligocene of Barbados; Eocene
and Miocene of Spain; Aquita-
nian of Algeria; Eocene of Bul­
garia.
Miocene of Kar Nicobar; Miocene
and Pliocene of Borneo ; Pliocene
of Fiji; Miocene of Jamaica;
Tertiary of Dominican Republic ;
Eocene and Oligocene of Bar­
bados ; Miocene of Spain, France,
and Egypt; Pliocene of Italy and
Greece.
Miocene of Kar Nicobar; Pliocene
of Fiji; Miocene of Japan; Eo­
cene of Saipan; Miocene of Ja­
maica and Dominican Republic;
Miocene of Spain, France, and
Algeria.
Miocene of Kar Nicobar; Pliocene
of Fiji.
Miocene of Kar Nicobar; Miocene
and Pliocene of Borneo and Java;
Eocene and Miocene of Saipan;
Eocene and Oligocene of Trinidad.
Miocene of Vienna Basin; Miocene
of Sumatra; Eocene, Oligocene,
and Miocene of West Indies; Eo­
cene, Oligocene, and Miocene of
Spain.
Oligocene, Alazan Formation of
Mexico; upper Eocene of Vene­
zuela ; Oligocene of Trinidad;
upper Oligocene of Dominican
Republic; middle Eocene to lower
Oligocene of Barbados; Miocene
of Spain; Pliocene of Japan ; Re­
cent of Philippines.
The chief local differences between the Miocene and
the Recent benthonic faunas are in the families Textu-
lariidae (7 species in the Recent and 1 in the Miocene),
Miliolidae (52 in the Recent and 2 in the Miocene),
Spirillinidae and Discorbidae (15 in the Recent and
not represented in the Miocene), and the families
Rotaliidae, Pegidiidae, Amphisteginidae, Calcarinidae,
and Cymbaloporidae (27 in the Recent and only 3
rotaliids in the Miocene). Thus there is not much in
common between the Miocene benthonic and the Recent
benthonic faunas. If anything, I believe the kinds of
benthonic species present in the Miocene, supported by
the negative evidence of the kinds that are not present
in the Miocene, indicate that the beds represented by
the few Miocene samples studied were deposited at
greater depths and farther from shore than the Recent
outer slope samples that were taken from depths less
than 200 fathoms.
Table 3 gives by localities the smaller Foraminifera
of Miocene age found in the Janum Formation on
Guam. Discrepancies are to be found between the
species noted in my original examination of these same
samples (Tracey and others, 1964, p. A43) and the
species given in table 3. These discrepancies have re­
sulted from (a) the shifting of a species from one genus
to another (such as Eponides umbonatus to Oridorsalis
and Siphonodosaria fijiensis to Orthomorphina) ; (b)
the synonymizing of one species with another (such as
Globigerina veneziwlana, a synonym of G. conglom-
erata, and Osangularia bengalensis, a synonym of 0.
culter) ; (c) the correction of identification (such as
Pulleniatina obliquiloculata for Globigerina inflata and
Globorotalia hirsuta for G. canariensis) ; and (d) the
refinement of identification (such as Gyroidina lamar-
ckiana and G. soldanii for G. spp.). In addition, some
of the indeterminate species and those whose generic
placement was questioned in the original study have
been eliminated from table 3.
TABLE 3. Distribution of smaller Foraminifera in the Miocene
of Guam
Species
Textulariidae:
Vulvulina spinosa Cushman___________
Valvulinidae:
Eggerella bradyi (Cushman)___________
Karreriella bradyi (Cushman)__________
Miliolidae:
Quinqueloculina lamarckiana d'Orbigny.
Pyrgo murrhina (Schwager)___________
Lagenidae:
Robulus sp__________________________
Dentalina communis d'Orbigny. _______
tauricornis Schwager. ____________
sp. A_____-___-_--_______.______
Dentalinal spp._____-___-___-____--_
Nodosaria equisetiformis Schwager _
insecta Schwager.________________
skobina Schwager ________________
Lagena gracilis Williamson.___________
Poly m orphinidae:
Pyrulina labiata (Schwager) ____ _______
Buliminidae:
Buliminella septata Keyzer____________
Bulimina aguafrescaensis Todd and
Kniker. __________-____-__-__--_--
Fissurina alveolata (Brady)__________
circulum Seguenza____-___-__-___
formosa (Schwager)______________
globosa Bornemann_______________
Bolivina aff. B. nitida Brady __________
pusilla Sehwager_________________
silvestrina Cushman______________
aff. B. sinuatum Galloway and
Wissler_ ______________________
X
X
X
X
Localities
X
X
X
X
X
X
X