radiolaria - Marum

Radiolaria 14 Bibliography - 1990
of apparently uninterrupted sedimentation, the section thickness
and the excellent fossil recovery, the Sandilands Formation has been
shown to contain an unusually thick upper Norian sequence and
probably the Triassic-Jurassic boundary.
Carter, E.S. & Galbrun, B. 1990. A preliminary note
on the application of magnetostratigraphy to the Triassic-
Jurassic boundary strata, Kunga Island, Queen Charlotte
Islands, British Columbia. Geol. Surv. Canada, curr. res.,
Pap., 90-1F, 43-46.
One hundred and five, 2.5 cm diameter, oriented cores were
obtained from Triassic-Jurassic strata of the Sandilands Formation
on Kunga Island in July 1989.
Casey, R.E., Weinheimer, A.L. & Nelson, C.O.
1990. Cenozoic radiolarian evolution and zoogeography of
the Pacific. Bull. marine Sci., 47/1, 221-232.
Modern day radiolarian distributions can be grossly divided into
warm and cold water spheres separated by the polar convergences
and the associated pycnocline. During the Paleogene both warn and
cold water sphere radiolarian diversities appear to have been lower
than during the Neogene. One major reason for this difference
appears to be the difference in the number of "packages" of water
(water masses essentially) for radiolarians to inhabit during these
times. The number of "packages" or provinces increased in the
Neogene due to the development of polar convergences and their
associated polar, shallow subpolar and intermediate waters, the
initiation of the formation of Antarctic (Polar) Bottom Water and
associated Circumpolar Water, and the development of the surface
Eastern Tropical Pacific as a specific "package" of water. Specific
examples of radiolarians evolving into these packages support these
contentions. Another Neogene development was the creation of a
new "package" that apparently resulted in the evolution, or
expansion, of a new niche, that of the symbiont bearing radiolarians
by a variety of taxa. This apparently was preceded by changes in
Antarctic geographies (and perhaps some biological influences) that
resulted in Antarctic glaciation and the development of this niche.
Chang, K.H., Woo, B.G., Lee, J.H., Park, S.O. &
Yao, A. 1990. Cretaceous and Early Cenozoic Stratigraphy
and history of Eastern Kyongsang Basin, S. Korea. Jour.
geol. Soc. Korea, 26/5, 471-487.
A detailed stratigraphic work has made it possible to
reconstruct the geology of the both sides of the Yangsan fault to the
pre-fault state. The dextral motion of the fault of about 35 km is
obvious since the geology fits very well if the eastern block is
rearranged about 35 km northward. Such a restoration shows the
original (i.e., pre-faulting) Yongyang subbasin characterized by the
Yongyang-type stratigraphic scheme of the Hayang Group. This
scheme is no more applicable beyond the southern boundary of the
so-reconstructed Yongyang subbasin. The Eocene acidic tuff
apparently was dissected by the Yangsan fault, which in turn was
concealed by the mid-Miocene sedimentation.
The northern peripheral part of the Yongyang subbasin is
dislocated due to the Yangsan and the associated faults. But, a prefault
reconstruction has figured out an east-west trending
"Pyonghae trough" in which the Kyongjongdong and the Ullyonsan
Formations deposited. It is presumed that the north-bounding scarpmaking
growth fault of the trough was forming but later turned into a
reverse fault now called the "llwol thrust".
A paleocurrent analysis with 158 cross-stratifications of the
Kyongjongdong Formation and the overlying Hayang Group indicates
a mean source area in the direction of N 54° E. Derived therefrom,
reddish and variegated radiolarian chert pebbles abundantly occur in
two separate intervals of the Hayang Group. The radiolarians
secured from the chert pebbles range in age from Middle Permian to
Early Jurassic. Coeval radiolarites, not at all found on Korean
peninsula, are widely distributed in the Tamba-Mino-Ashio and
Chichibu belts of Japan. Some of these belts may have been the
source area of the study area.
Cox, B.M. 1990. A review of Jurassic Chronostratigraphy
and age indicators for the UK. In: Tectonic events responsible
for Britain's oil gas reserves. (Hardman, R.F.P. & Brooks, J.,
Eds.), vol. 55. Special Publications of the Geological
Society of London, London, U.K. pp. 169-190.
The basis of the chronostratigraphic subdivision of the Jurassic
System is the sequence of ammonite faunas. At present, the 11
Jurassic stages (representing approximately 70 million years) can
be divided into 145 ammonite-based zones or subzones. Methods of
subdivision and correlation by various microfossil groups have also
been developed for practical and economic reasons. Dating by
fossils (biostratigraphy) underpins the broader-based approachs of
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event and sequence stratigraphy. It also supplies the primary
stratigraphic control in the development of a standard magnetic
polarity time-scale (magnetostratigraphy) of global applicability. At
present, the Jurassic System of the UK area is divided into 38 units
(biozones and subzones) on the basis of dinoflagellate cysts and 23
on the basis of calcareous nannofossils. Coverage is less
comprehensive using the benthonic groups (foraminifera and
ostracoda) which are more affected by environmental controls. The
Lower Jurassic is divided into 16 units on the basis of foraminifera,
but higher in the System only local divisions can be recognised in the
Bathonian and informal divisions in the Callovian and oldest
Oxfordian. There is fuller but still incomplete coverage using
ostracoda which have proved particularly useful in the non-marine,
brackish and marginal marine sequences of the Bathonian and
Portlandiam The recovery of radiolaria from Jurassic sediments in
the UK arca is a new an(l exciting development which allows division
of Kimmeridgian and Portlandian strata in graben areas in the North
Sea Basin.
Danelian, T. & Baudin, F. 1990. Découverte d'un
horizon carbonaté, riche en matière organique, au sommet des
radiolarites d'Epire (zone ionienne, Grèce): le Membre de
Paliambela. C.R. Acad. Sci. (Paris), Sér. II, 311, 421-428.
A litho- and biostratigraphical study performed on a carbonated
sequence from north-western Greece, allows a definition of a new
member on the top of the Upper Jurassic series from the Ionian zone:
the Paliambela Member. This Member is paleontologically dated from
the Middle Oxfordian to the Lower Tithonian and is mainly composed
of organic-rich micrites with Radiolaria and thin Bivalves. It is the
first characterization of organic-rich sequence in the Callovian-
Kimmeridgian in the Ionian zone, which probably has a localized
paleogeographical meaning.
De Wever, P., Bourdillon de Grissac, C. &
Bechennec, F. 1990. Permian to Cretaceous radiolarian
biostratigraphic data from the Hawasina Complex, Oman
Mountains. In: The Geology and Tectonic of the Oman
Region. (Robertson, A.H.F., Searle, M.P. & Ries, A.C.,
Eds.), vol. 49. Special Publications of the Geological
Society of London, pp. 225-238.
The analysis of foraminifera and radiolaria in 3000 carbonate
and 150 siliceous rock samples from the Oman Mountains results in
revision of the existing stratigraphy and supports the definition of
new units. In the Hawasina allochthonous unit the main results are as
follows: (i) Permian bedded chert exists near the base of the
sequence and is thus the first Permian bedded chert occurrence
reported from the Tethyan region); (ii) an important volcanic event is
dated as Triassic; (iii) bedded chert horizons are dated as Liassic;
(iv) the thick turbiditic sequence has been divided into several units
of Middle and Late Jurassic age. In the Samail ophiolite: (i) the ages
of four tectonic episodes were established from the beginning of
oceanic spreading (Albian—Early Cenomanian), to the obduction of
the ophiolitic nappe (Campanian)
De Wever, P., Caulet, J.P. & Bourgois, J. 1990.
Radiolarian biostratigraphy from Leg 112 on the Peru
margin. In: Proceedings of the Ocean Drilling Program,
Scientific Results. (Suess, E., Von Huene, R. et al., Eds.),
vol. 112. College Station, TX (Ocean Drilling Program), pp.
181-207.
The radiolarian fauna found at the 10 sites drilled during Ocean
Drilling Program (ODP) Leg 112 range in age from Eocene to
Holocene. Relatively abundant and well-preserved assemblages are
present in Sites 682, 683, 685, and 688. Occurrence tables of 175
species are presented for these sites. For each site, stratigraphic
results are summarized in two figures showing the radiolarian
biozonation, the inferred hiatuses, and barren intervals. The
Pliocene/Pleistocene and Miocene/Pliocene boundaries were not
recognized from radiolarian stratigraphy. Pleistocene and middle
Miocene radiolarian assemblages are generally abundant and well
preserved. New stratigraphic data are given for some rarely
described species, such as Cypassis irregularis, Lamprocyrtis
daniellae, Plectacantha cresmatoplegma, Pterocanium grandiporus,
Pseudocubus warreni, and Phormostichoartus (?) crustula.
De Wever, P., Martini, R. & Zaninetti, L. 1990.
Datation paléontologique des radiolaires du Lagonegro
(Formation du Monte Facito, Italie méridionale).
Individualisation dès le Trias moyen de bassins pélagiques en
Téthys occidentale. C.R. Acad. Sci. (Paris), Sér. II, 310,
583-589.
Divakar-Naidu, P. 1990. Distribution of upwelling index
planktonic foraminifera in the sediments of the western