radiolaria - Marum

Radiolaria 14 Bibliography - 1992
This P. u-forma Group shows a wide variation in its pseudo-abdominal
morphology.
Kuwahara, K. & Sakamoto, M. 1992. Late Permian
Albaillella (Radiolaria) from a bedded chert section in the
Gujo-hachiman area of the Mino Belt, central Japan:
preliminary report on morphometry and cluster analysis. J.
Geosci. Osaka City Univ., 35, 33-52.
Eight species of Late Permian Albaillella (A. excelsa, A. flexa n.
sp., A. Iauta n. sp., A. Ievis, A. sp. aff. A. Ievis, A. triangularis, A. sp.
A, and A. sp. B) were recognized from radiolarian assemblages in a
bedded chert section in the Gujo-hachiman area of the Mino Belt,
Central Japan. Quantitative features were measured for a total of
1000 specimens representing eight species of Albaillella. Their
morphometry indicates morphological distinctions among species.
From their stratigraphic distribution and resemblance of shell forms,
A. excelsa, A. flexa, A. Iauta, A. sp. A, and A. sp. B are considered to
have closely phylogenic relations.
Cluster analysis was attempted to well preserved specimens
representing five species of Albaillella, in order to ascertain
classification by visual inspection. Each clustered group generally
corresponds to each species.
Lazarus, D.B. 1992. Antarctic Neogene radiolarians from
the Kerguelen Plateau, Legs 119 and 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. 785-809.
Abundant, generally well-preserved radiolarians from Sites
737, 744, 745, 746, 747, 748, and 751 were used in stratigraphic
analysis of Neogene, and particularly middle Miocene to Holocene,
Kerguelen Plateau sediments. The composite Kerguelen section is
more complete than the Weddell Sea sections recovered by Leg 113,
and the radiolarians are better preserved. Leg 113 radiolarian
zonations of Weddell Sea sites were applicable with only slight
modification, and three new zones—Siphonosphaera vesuvius,
Acrosphaera? Iabrata, and Amphymenium challengerae—are
proposed for the latest Miocene. Geologic age estimates are given
for all radiolarian zones used. Major hiatuses affecting most sites
were seen within the middle Miocene, in the latest Miocene, and
latest Pliocene. Five new species are described: Acrosphaera?
Iabrata, Acrosphaera? mercurius, Siphonosphaera vesuvius,
Actinomma? magnifenestra, and Helotholus? haysi.
Ling, H.Y. 1992. Radiolarians from the Sea of Japan: Leg
128. In: Proceedings of the Ocean Drilling Program,
Scientific Results. (Piscotto, K.A., Ingle, J.C., Von
Breymann, M.T. et al., Eds.), vol. 127-128/1. College
Station, TX (Ocean Drilling Program), pp. 225-236.
The analysis of radiolarians from Japan Sea subsurface
sediments recovered during Leg 128 of the Ocean Drilling Program
reveals that a warm-water assemblage similar to that of the North
Pacific was replaced by unique post-middle Miocene faunas probably
as a result of the restriction of oceanographic circulation. The
modern fauna was gradually established only in the Pleistocene. No
attempt was made to establish the radiolarian zonation because of
low species diversity and the absence of generally recognized index
forms in the North Pacific. In the diagenetically altered quartz
section, however, a radiolarian assemblage correlative to the middle
Miocene Cyrtocapsella tetrapera Zone of western Honshu was
identified from Hole 799B.
Ling, H.Y. & Kobayashi, H. 1992. Geological
significance of siliceous microfossils from Dogo, Oki
Islands. In: Centenary of Japanese Micropaleontology.
(Ishizaki, K. & Saito, T., Eds.). Terra Scientific Publishing
Company, Tokyo, Japan. pp. 439-447.
Marcucci-Passerini, M. & Gardin, S. 1992. The
Fosso Cupo Formation (northern Latium, Italy): redefinition
and new age data from radiolarian and calcareous nannofossil
biostratigraphy. Cretaceous Res., 13, 549-563.
The "Varicoloured Manganiferous Shales", cropping out at
Monti della Tolfa (northern Latium, Italy) constitute the stratigraphic
substratum of the Upper Cretaceous Pietraforte Flysch in the Ligurid
nappes of the Northern Apennines. These shales are here renamed
the 'Fosso Cupo Formation'. A detailed study of radiolarians and
calcareous nannofossils permits assignment of this formation to the
Turonian-late Santonian interval. Previous data indicated an
uncertain age ranging from Aptian/Albian to Late Cretaceous. A new
radiolarian subspecies, Crucella cachensis tolfaensis, is described.
- 83 -
Maruyama, T., Takemura, A. & Hiroo, I. 1992.
Result from ODP Leg 120 (Kerguelen Plateau) - Special
reference to diatom, radiolarian and paleomagnetism. Earth
Sci., J. Assoc. geol. Collab. Japan, extra, 6, 154-160. (in
Japanese)
Matsuoka, A. 1992a. Skeletal growth of a spongiose
radiolarian Dictyocoryne truncatum in laboratory culture.
Mar. Micropaleontol., 19/4, 287-297.
The stages of skeletal growth of the radiolarian Dictyocoryne
truncatum were observed using scanning electron and light
microscopy. Four growth stages were recognized through
comparison of laboratory-grown individuals with various sized
skeletons which were collected by plankton tows near Barbados.
Skeletal size is expressed as test height, which is the largest value
among the three dimensions between a base line and arm apex of a
triangular skeleton. The early stage (stage 1), with a maximum
height of less than approximately 120 µm, is a uniformly spongiose,
triangular skeleton lacking arms and a patagium. The next stage
(stage 2) is a triangular skeleton with slightly concave sides of ca.
120-200 µm size with three arms and a lace-like patagium. Further
accretion of silica on the patagium conceals its lace-like structure,
making a skeleton (stage3;ca.200-280 µm) with a more uniformly
spongiose patagium. The mature stage (stage 4) with a maximum
height more than ca. 280 µm is a triangular skeleton with convex
sides, resulting from an outward growth of the patagium. Additional
maturation produces an accretion of spongiose silica on the central
part of the skeleton, forming a thickly biconvex skeleton in
transverse section. One hundred and one individuals of D. truncatum
were cultured in the laboratory at 28 ° C, 35‰ salinity and 165
µE/m 2 /s light intensity, with maximum and mean longevity of 37 and
6.4 days, respectively. The mean growth of 57 specimens which
grew in the laboratory culture was 24.7 µm, with a maximum of 95
µm. The initial size of cultured specimens ranged from 103 to 325
µm, covering all of the four growth stages. Some specimens grew
from one stage to the next stage changing skeletal morphology. The
mean growth rate of four specimens which grew from stage 3 to 4 in
laboratory culture was 5.4 µm/day (range 4.5-6.5 µm/day).
Sporadic growth patterns exhibiting periods of rapid growth (15-20
µm per day ) punctuated by intervals of little or no growth were
observed in some cultured specimens. The sporadic growth may be
related to a physiological rhythm of the organisms rather than
environmental factors. The silica-depositing capacity is related
largely to the vitality of the organisms. Discolored specimens and
specimens with weakly extended axopodia showed no skeletal
growth.
Matsuoka, A. 1992b. Diversity of Jurassic Nassellarians
in Japan. In: Proceedings of the Third Radiolarian
Symposium. (Sakai, T. & Aita, Y., Eds.), vol. 8. News of
Osaka Micropaleontologists, special Volume, Osaka. pp. 63-
66. (in Japanese)
Matsuoka, A. 1992c. Jurassic-Early Cretaceous tectonic
evolution of the Southern Chichibu terrane, southwest Japan.
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. 71-88.
The Southern Chichibu terrane fringes the southern margin of
the Jurassic-Early Cretaceous accretionary complex of southwest
Japan. Two subterranes, the Togano subterrane in the north and
Sambosan subterrane to the south, are recognized by examination of
the common features of the terrane. They are juxtaposed throughout
the terrane from western Kyushu to the Kanto Mountains a distance
of over 1000 km. The geology of the Sakawa area, central Shikoku,
is described in detail to show an example of the terrane. The geology
around Tsukumi in eastern Kyushu and Okutama in the Kanto
Mountains is introduced to emphasize the common features of this
terrane.
The Togano subterrane is composed of predominantly Triassic
Jurassic chert clastic sequences associated with subordinate
Jurassic olistostromal sequences and Upper Jurassic-Lower
Cretaceous limestone-bearing clastic sequences. The chert-clastic
sequences show an upward-coarsening sequence which reflects
landward drift of the sea floor from a pelagic realm towards a trench.
The olistostromal sequence contains abundant upper Paleozoic
blocks. This subterrane is characterized by a south-vergent
imbricate structure and south-younging polarity of the chert-clastic
sequences.
The Sambosan subterrane consists of mainly Upper Jurassic-
Lower Cretaceous olistostromal sequences associated with Upper
Jurassic Lower Cretaceous limestone-bearing clastic sequences. The
olistostromal sequence includes abundant Triassic-Jurassic chert
blocks and Triassic limestone blocks accompanied by greenstones.