Results 181 to 190 of about 8,989 (210)

The enigma of the Diporotheca palynomorph

Review of Palaeobotany and Palynology, 2016
In the Quaternary palynological literature, the name Diporotheca rhizophila has come to be applied for fungal spores labelled in the Hugo de Vries-Laboratory (HdV) in Amsterdam (The Netherlands) as Type HdV-143. The widespread occurrence of this taxon in palynological preparations was difficult to understand as the species is definitely known only from
Hawksworth, D.L., van Geel, B., Wiltshire, P.E.J.   +2 more
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The challenge of abundance in palynomorphs

Geoscience and Man, 1975
Abstract An annotated summary is provided of several papers by the author on a new method of data handling that both demands and allows for the much more efficient use of the abundance of palynomorphs in fine stratigraphy. The purpose of assemblage types, biorecords, comparison records, event compilation, bracket correlation, and various nomenclatural ...
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Differential morphographic identity of Gondwanic palynomorphs

Journal of Palaeosciences, 1995
The exine structures, bauplan and germinal apertures are the basic characters for the morphographic of fossil spores and pollen. The apparent but unreal form-similarities of some bisaccate pollen taxa or Sporae dispersae from Gondwanaland on one hand and those in the contemporary Euromerian sequences on the other, have been sorted out in this paper ...
R.S. Tiwari, null Vijaya
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Paleozoic Palynomorphs from Libya

1964
Marine sediments were deposited in western Libya during most of Paleozoic time The resulting rock section consists of a thick sequence of detrital rocks largely dark gray shales and sandstones ranging in age from Cambrian to Permian A high proportion of the fine grained detrital rocks from the Cambrian through Carboniferons Systems contain spores ...
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Palynomorphs indicating Permian rocks in Ethiopia

Nature, 1976
KARROO (Carboniferous to Triassic) strata have been reported in Ethiopia1,11,12, but without firm documentation. Other sediments lying on the crystalline basement but beneath the Jurassic Adigrat Sandstone2 may also be of Karroo age3–5. To our knowledge, however, the occurrences reported here are the first palaeontologically substantiated records of ...
A. DAVIDSON, D. C. MCGREGOR
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Late Pennsylvanian climate changes and palynomorph extinctions

Review of Palaeobotany and Palynology, 1996
A major floral change occurs in the Upper Pennsylvanian strata in the Midcontinent, Illinois basin, and in the northern Appalachian basin of eastern United States. Lycospora spp. (derived from arborescent lycopsids) became extinct along with some other palynomorph taxa. This investigation is concerned with the importance of this major floral change.
Robert M. Kosanke, C.Blaine Cecil
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Organic-walled microfossils (palynomorphs)

1996
Abstract This chapter deals with organic-walled microfossils or palynomorphs. These range in size from 5-2000 µ,. Preparation of samples for organic-walled microfossil study generally consists of hydrochloric and fuming nitric acid leaching of calcareous material and hydrofluoric acid leaching of siliceous material followed by sieving ...
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Late Westphalian palynomorphs from northern Saudi Arabia

Review of Palaeobotany and Palynology, 1995
Abstract Late Carboniferous (Westphalian D) miospore assemblages are reported from an exploration borehole in the northwestern part of Saudi Arabia. The presence of stratigraphically diagnostic monolete miospore genera are reported for the first time in the Arabian Peninsula.
B. Owens, N. Turner
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Late Cretaceous Palynomorphs from Northeastern Arizona

Micropaleontology, 1969
The coal-bearing Dakota Sandstone at Coal Canyon, Arizona, in the western portion of the Black Mesa basin, yielded abundant, diverse, and generally well-preserved spores, pollen, and microplankton, including ten new species and two new genera.
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Lower Cambrian palynomorphs from Howth, Co. Dublin

Geological Journal, 1977
AbstractEvidence for the age of the Bray Group in southeastern Ireland is very limited. In this paper, a sample from the Gaskin's Leap Formation of the Bray Group succession in the Howth peninsula is shown to contain acritarchs of probable Lower Cambrian age.
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