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31.
Prof. Dr. Dietrich Schumann 《Facies》1995,32(1):189-202
Summary Rudist and stromatoporid associations of the Campanian from Central Oman are nearly monospecific. They are dominated byDurania aff.nicholasi, Vaccinites vesiculosus, Torreites milanovici or phaceloid and massive stromatoporids. Several other rudist genera play a secondary role. The thickness of the associations
is rarely more than one metre. Solitary corals do not occur in the associations. Colonial corals are less common, although
they are up to 1 m high and show considerable diversity. There are no binders. The reef structure indicates variable hydrodynamic
conditions. They are always associated with very shallow water. The pureDurania aff.nicholasi patches with large colonial corals andTorreites milanovici are presumably the most rigid structures. The near monospecific associations ofVaccinites vesiculosus are widely distributed. Although mostly preserved in situ, strong currents, presumably caused by tropical storms, have repeatedly
impaired and interrupted growth. The specific growth characteristics of the shell of some rudists, especially the radiolitids,
enable an estimation of the individual lifespan. Frameworks of approximately 1 metre thickness probably developed in ±100
years. The sediments of the complete sections are predominantly bioclastic. 相似文献
32.
33.
We surveyed a French male population for the incidence of missing or reduced upper lateral incisors (ULI). In 5,738 subjects, we observed an incidence of 1.59% with one or two reduced ULI (the other normal) and 1.90% with one or two missing ULI (the other normal or reduced), altogether, 3.49% affected subjects. Furthermore, 250 random controls were observed. Agenesis of other teeth is more frequent in propositi. Missing third molars were 12.4% in controls, 24.0% in propositi with reduced ULI and 39.6% in propositi with two missing ULI. Furthermore, agenesis of incisors, canines and premolars ranges from 0.4% in controls to 1.3% in propositi having reduced ULI and 5.0% in propositi with two missing ULI. So, propositi with reduced ULI are intermediate between the controls and the propositi with missing ULI with respect to the frequency of agenesis of other teeth. On the other hand, a different ranking is observed with respect to the teeth measurements: reduction of tooth size is more marked in propositi with reduced ULI than in propositi with missing ULI. The reduction mainly affects canines, incisors and to a lesser degree, premolars. Arch length and interpremolar diameters are smaller in propositi with missing ULI, compared with controls. 相似文献
34.
South-Central European fossil hominids dated to the Upper Pleistocene exhibit a distinct morphological and metric continuum in supraorbital form from early Neandertal (Krapina), through late Neandertals (Vindija), to early Upper Paleolithic hominids. The supraorbital morphologies pertinent to this continuum are documented, and the alterations in size and morphology are discussed ralative to the function of supraorbital superstructures and their relationship to overall craniofacial form. It is concluded that this continuum most likely reflects localized transition between Neandertals and modern man in this region of Europe. 相似文献
35.
36.
湘西北志留纪胴甲鱼化石 总被引:6,自引:2,他引:4
本文记述了采自湘西北澧县石门水库附近秀山组上段隶属云南鱼目的 Shimenolepis graniferus gen. et sp. nov. 和 QuJinolepidae gen. et sp. indet. 化石,对含鱼层的时代也进行了讨论. 相似文献
37.
Dr. Andreas May 《Facies》1992,26(1):103-116
Summary The prevailing sandy/silty lower part of the Middle Devonian in the northwestern Sauerland includes two coral limestone horizons,
which contain a rich fauna of corals, stromatoporoids, and calcareous algae. The Ihmert-Formation is subdvided into three
parts. The older coral limestone horizon is the Grünewiese-Member of the Ihmert-Formation (uppermost Eifelian), the younger
is in the Bredenbruch-Member of the Unterhonsel-Formation (lower Lower Givetian).
Conclusions about the environmental constraints are drawn from the sedimentology and the fossil content of the coral limestones.
Predominant biostromes are built between storm wave base and normal wave base. Only the few bioherms grew above the normal
wave base. These coral limestones were deposited in a tropical or subtropical normal marine environment in the shallow euphotic
zone. Among the reef-builders epoecism is very frequent, and until now this phenomenon has not been investigated in detail.
Fragile rugose and tabulate corals lived as commensals with stromatoporoids. Some other aspects of paleoecology are concisely
presented. 相似文献
38.
Dr. Jindrich Hladil 《Facies》1992,26(1):35-54
Summary A discussion arose in 1977 regarding the nature of the Silurian/Devonian boundary bed at Klonk, and the beds below and above
it. Present revision of the stratotype sequence found that most clayey limestones display a multiple and composed rhythmic
arrangement of laminae. Deposition of pelagic particles, effects of traction bottom currents, and turbidite inputs are distinguishable,
however, the latter are rare. Semilithified surfaces and hardgrounds were found. The boundary bed No. 20 consists of several
laminated rhythms. The Devonian base, marked by first occurrences ofMonograptus uniformis corresponds to a semilithified surface, a break in deposition for several tens to hundreds of years, and a change in direction
of bottom currents. A moderately rippled set at the Devonian base is only about 1 cm thick and passes again into the horizontal
laminated rhythms. The deposition of the boundary bed lasted about 1.2 to 2.0 Ka. It cannot be explained as a turbidite. 相似文献
39.
For a long time, the evolutionary series of a idoraptids-dimorphograptids-monograptids has been generally recognized by graptolite researchers. In the past years, the akidograptids were found to appear in the Lower Silurian Parakidograptus acuminatus Zone, while the dimorphograptids in the P. acuminatus and Orthograpius vesiculosus Zones, but the monograptids appeared as late as in the O. vesiculosus zone; this evolutionary series can be easily accepted by other people. Chen Xu and Lin Yao-kun (1978) pu... 相似文献
40.
Nikolaos Salakius 《Geobios》1982,15(6):873-889
A new, strongly spiroconvex Globotruncana species,Globotruncana pseudoconica nov. sp., is described from the Maastrichtian of Tunisia. It is distinguished from Globotruncana conicaWhite in morphology and phylogeny. Some Maastrichtian, strongly spiroconvex specimens referred to as Globotruncana conicaWhite, are shown to be identical to Globotruncana pseudoconica nov. sp. The new species reveals close affinity with Globotruncana falsostuartiSigal from which it has evolved during the middle Lower Maastrichtian. 相似文献