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Journal ArticleDOI

Precambrian micro‐organisms and evolutionary events prior to the origin of vascular plants

J. William Schopf
- 01 Aug 1970 - 
- Vol. 45, Iss: 3, pp 319-352
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TLDR
The nature of the early Palaeozoic life was a fertile subject for speculation as mentioned in this paper, however, evidence of this development remained largely undeciphered ; the nature of Precambrian life was also fertile subject to speculation.
Abstract
The nature of the Precambrian biota-its antiquity. composition and evolutionand the well-known faunal discontinuity near the beginning of the Palaeozoic. have long been recognized as particularly puzzling problems in palaeontology . The evolutionary continuum well-documented in Phanerozoic sediments and the diversity and complexity of the early Palaeozoic biota augur well for a substantial period of Precambrian evolutionary development . Until recently. however. evidence of this development remained largely undeciphered ; the nature of Precambrian life was a fertile subject for speculation. essentially unfettered by the poorly known fossil record . The past few years have witnessed a renewed interest in these classic problems and a marked proliferation of available data; this increased activity has resulted in the

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The phagotrophic origin of eukaryotes and phylogenetic classification of Protozoa.

TL;DR: It is argued that the essentially autogenous origins of most eukaryotic cell properties (phagotrophy, endomembrane system including peroxisomes, cytoskeleton, nucleus, mitosis and sex) partially overlapped and were synergistic with the symbiogenetic origin of mitochondria from an alpha-proteobacterium.
Journal ArticleDOI

The origin of land plants: a matter of mycotrophism.

K.A. Pirozynski, +1 more
- 01 Mar 1975 - 
TL;DR: It is hypothesized that terrestrial plants are the product of an ancient and continuing symbiosis of a semi-aquatic ancestral green alga and an aquatic fungus-an oomycete that were equipped to cope with the problems of desiccation and starvation associated with terrestrial existence.
Journal ArticleDOI

Early cretaceous fossil evidence for angiosperm evolution

TL;DR: Comparisons of dated pollen floras of other regions indicate that one major subgroup of angiosperms, tricolpate-producing dicots (i.e., excluding Magnoliidae of Takhtajan) originated in the Aptian of Africa-South America at a time of increasing aridity and migrated poleward into Laurasia and Australasia.
Journal ArticleDOI

Photochemical activity and components of membrane preparations from blue-green algae. I. Coexistence of two photosystems in relation to chlorophyll a and removal of phycocyanin.

TL;DR: Action spectra and relative quantum efficiency measurements demonstrated the existence of both Photosystem I and Photosystem II in membrane fragments which contained chlorophyll a as the only significant light-absorbing pigment.
References
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Journal ArticleDOI

Aliphatic Hydrocarbons in Pre-Cambrian Rocks

TL;DR: Analyses of sedimentary rocks from the Pre-Cambrian of South Africa show that they contain a variety of alkanes as mentioned in this paper, and were these hydrocarbons incorporated into the sediments at the time of deposition, and are they biogenic in origin?
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Reproductive structures and taxonomic affinities of some nannofossils from the gunflint iron formation

TL;DR: This work presents what it takes as both a final link in the chain of evidence for a biological origin and the basis for more satisfactory conclusions as to the taxonomic affinities of some of the conspicuous biotal elements of the Gunflint microbiota.
Journal ArticleDOI

Fatty acids and hydrocarbons as evidence of life processes in ancient sediments and crude oils

TL;DR: Sediments and crude oils analyzed for fatty acids, considering abiological or bacterial origin of acids as mentioned in this paper, were found to be suitable for fatty acid analysis considering either biological or bacterial sources.
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