radiolaria - Marum

Bibliography - 1992 Radiolaria 14
(mid latitude) and the Spongaster pentas zone (low latitude) and that
the age is middle to late Pliocene. The Nobori radiolarian fauna is
considered to be a transitional type from typical low to mid latitude
fauna, and is characterized by the predominant occurrence of
pyloniaceans, on the other hand, the nassellarians are relatively rich
in Cycladophora pliocenica representing one of cold water species.
Pseudodictyophimus hexaptesimus, Bathropyramis (?) pyrgina,
Eucyrtidium lene are newly described.
Swanberg, N.R. & Bjørklund, K.R. 1992. The
radiolarian fauna of western Norwegian fjords: a multivariate
comparison of the sediment and plankton assemblages.
Micropaleontology, 38/1, 57-74.
Radiolarian assemblages from the plankton and sediments in
various Norwegian fjords and sediments from stations in the
Norwegian Sea were compared using multivariate analysis. The
sediments were very different from all of the plankton in all seasons.
This difference was the largest source of variability in the data set,
followed in turn by differences due to season, regions, various
fjords, depths and locale within a given fjord. The sediments did not
average the seasonal plankton signals observed, but did conserve
most of the geographical information presented in the plankton
assemblage. The information in the plankton and sediments was
conveyed by different groups of species. While the sediments can be
excellent indicators of environmental conditions in the overlying
water column, they say relatively little about the species
composition in the overlying plankton.
Swanberg, N.R. & Eide, L.K. 1992. The radiolarian
fauna at the ice edge in the Greenland Sea during summer,
1988. J. marine Res., 50, 297-320.
Radiolaria were sampled from the plankton at 18 stations
during two cruises in the Greenland Sea during summer, 1988. A
total of 43 species or categories of Radiolaria was found, but over
90% of the radiolarian fauna was dominated by adults or juveniles of
4 species: the spumellarian, Actinomma leptodermum and the
nassellaria, Amphimelissa setosa, Pseudodictyophimus gracilipes,
and Peridium longispinum. The stations sampled ranged from icecovered
areas high in nutrients to open water areas which were
depleted in nutrients. These stations encompassed a gradient in the
composition of the radiolarian fauna from an assemblage dominated
by juveniles and adults of A. setosa and P. gracilipes at the ice edge
to one dominated by Actinomma juveniles, A. Ieptodermum, and P.
Iongispinum in open water. The total abundance of Radiolaria
correlated with integrated phaeopigment, but not with chlorophyll a.
In discriminate function analysis the 'ice edge' radiolarian species
listed above correlated well with chlorophyll a and phaeopigments,
while the 'open water' species did not. Several water masses occur in
the area, which complicates the interpretation considerably, but the
data are consistent with the development of a radiolarian population
in tempo with, and in all probability linked successionally to the
development of the phytoplankton—microplankton bloom.
Takahashi, O. & Ishii, A. 1992. Tectonostratigraphic
division and radiolarian biochronology of the Otaki Group of
the northern Shimanto Belt, Kanto Mountains, central Japan
- The deforming processes and duplex structures of the
northern Shimanto Belt in the Kanto Mountains.
Bull.Saitama Mus. nat. Hist., 10, 11-28.
Takemura, A. 1992. Radiolarian Paleogene
biostratigraphy in the southern Indian Ocean, Leg 120. In:
Proceedings of the Ocean Drilling Program, Scientific
Results. (Wise, S.W.J., Schlich, R. et al., Eds.), vol. 120.
College Station, TX (Ocean Drilling Program), pp. 735-756.
During Ocean Drilling Program Leg 120, an almost complete
Paleogene sediment section on the Kerguelen Plateau in the southern
Indian Ocean was recovered. The biostratigraphy of radiolarians from
these sediments at Sites 748 and 749 is studied. A biostratigraphic
framework established in low and middle latitudes is not applicable
because of the absence of most zonal marker species. Biogenic opal
is present only in middle Eocene to Oligocene sediments, and three
new zones-Lychnocanoma conica, Axoprunum(?) irregularis, and
Eucyrtidium spinosum zones-are proposed. The Paleogene antarctic
radiolarian fauna is different from that in low and middle latitudes.
Three new species, Axoprunum(?) irregularis, Eucyrtidium cheni, and
Eucyrtidium spinosum, are described.
Taketani, Y. & Kanie, Y. 1992. Radiolarian age of the
Lower Yezo Group and the upper part of the Sorachi Group in
Hokkaido. In: Centenary of Japanese Micropaleontology.
(Ishizaki, K. & Saito, T., Eds.). Terra Scientific Publishing
Company, Tokyo, Japan. pp. 365-373.
- 90 -
The Lower Yezo Group and the Sorachi Group are distributed in
the Sorachi-Yezo belt which trends N-S in Hokkaido, and the
Kamuikotan Metamorphic Rocks also occur in this belt. The Lower
Yezo Group consists of terrigenous rocks, and the Sorachi Group is
composed mainly of green rocks and siliceous shale. The Lower Yezo
Group overlies conformably the Sorachi Group. Radiolarian fossils
occur in many localities of the Lower Yezo and Sorachi Groups. The
age of these groups based on radiolarian assemblages is as follows:
The Lower Yezo Group is of late Hauterivian to early Albian age; the
uppermost part of the Sorachi Group is equated with the late
Hauterivian; and the lower upper part of the group is of Berriasian to
early Hauterivian age.
Tonielli, R. 1992. Two new radiolarian species from the
"Calcari Diasprigni" Fm of Mt. Terminilleto (RI).
Paleopelagos, 2, 163-173.
Middle to Late Jurassic radiolarite deposits are well-exposed in
the Mt. Terminilletto succession. The study of radiolarian
assemblages led to the recognition of two new species. The
stratigraphical distribution and taxonomic characters of the latter
suggest that they possess a good biostratigraphic potential.
Umeda, M., Goto, H. & Ishiga, H. 1992. MIddle
Ordovician radiolarians from the Lachlan Fold Belt,
southeastern Australia. Mem. Fac. Sci., Shimane Univ., 26,
131-140.
Umeda, M., Kugimiya, Y. & Ishiga, H. 1992. Late
Triassic-Early Jurassic radiolarians from chert pebbles of the
middle Miocene in northern part of Ooda City, Shimane
Prefecture, Japan. Geol. Rep. Shimane Univ., 11, 71-76. (in
Japanese)
Vasicek, Z., Rehakova, D., Michalik, J.,
Peterkáková, M. & Halásová, E. 1992. Ammonites,
Aptychi, Nanno- and Microplankton from the lower
Cretaceous Pieniny formation in the Kysuca Gate near Zilina
(western Carpathian Klippen Belt, Kysuca Unit). Západné
karpaty, Sér. Paleont., 16, 43-58.
The outcrops in steep sides of the Rochovica and Brodnianska
Hora hills squeezing the Kysuca Gate (a break of the Kysuca River
into the Vah River Valley by Zilina) yield the classical sections of the
Kysuca Unit of the Klippen Belt. The sequence of the "Rudina
Klippe" overturned to the east crops out in the western end of the
Varin section of the Klippen Belt between the Magura Unit on the
north and the Manin Unit on the south. It consists of Aalenian to
upper Turonian members. Jurassic/Cretaceous boundary beds
cropping out in a quarry near the Brodno railway station dealt with
more complete Lower Cretaceous sequence exposed along right side
of the Kysuca River on the southern Rochovica foothill. This paper
deals with the distribution of microfauna (Calpionellids, radiolarians
and foraminifera), macrofauna (apticci and ammonites) and
nannoplankton for the Jurassic-Cretaceous boundary.
Vishnevskaya, V. 1992. Significance of Mesozoic
radiolarians for tectonostratigraphy in Pacific Rim terranes of
the former USSR. In: Significance and application of
Radiolaria to terrane analysis. (Aitchison, J.C. & Murchey,
B.L., Eds.), vol. 96/1-2. Special Issue: Palaeogeogr.
Palaeoclimatol. Palaeoecol., Elsevier, Amsterdam. pp. 23-
39.
The application of new methods for the extraction of
radiolarians from dense cherts, jaspers and tuffs in fold belts of the
Far East USSR enables us to revise the lowest age limit of
volcanogenic-siliceous rocks along the NW Pacific Rim from Late
Jurassic to Early or Late Permian. The discovery of new radiolarian
localities in the Koryak Upland, Kamchatka allows determination of
the age of siliceous rocks in several ophiolite belts and provides
indications of paleolatitude in some terranes. Radiolarians have been
extracted to aid in terrane analysis as well as geological-tectonic
mapping and palinspastic reconstructions. High diversity Middle
Cretaceous radiolarian assemblages from some allochthons of North
Kamchatka resemble those from Site 466 of Leg 62 and Site 585 of
Leg 89 in the Pacific Ocean as well as some from low latitude Cuban
sections. This may be considered as evidence for the large scale
lateral tectonic dislocations of these blocks since the Aptian-early
Albian.
Wakita, K., Kojima, S., Okamura, Y., Natal'in,
B. & Zyabrev, S.V. 1992. Triassic and Jurassic
Radiolaria from the Khabarovsk complex, eastern Russia. In:
Proceedings of the Third Radiolarian Symposium. (Sakai, T.