TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans
ABSTRACT Biomarker molecular fossils in 2770 Ma shales suggest that the Eucarya diverged from other principal domains early in Earth history. Nonetheless, at present, the oldest fossils that can be assigned to an extant eukaryotic clade are filamentous red algae preserved in ca. 1200 Ma cherts from...
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crwiley:10.1111/j.1472-4677.2004.00027.x 2024-09-09T19:24:46+00:00 TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans JAVAUX, EMMANUELLE J. KNOLL, ANDREW H. WALTER, MALCOLM R. 2004 http://dx.doi.org/10.1111/j.1472-4677.2004.00027.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1472-4677.2004.00027.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1472-4677.2004.00027.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Geobiology volume 2, issue 3, page 121-132 ISSN 1472-4677 1472-4669 journal-article 2004 crwiley https://doi.org/10.1111/j.1472-4677.2004.00027.x 2024-07-30T04:19:54Z ABSTRACT Biomarker molecular fossils in 2770 Ma shales suggest that the Eucarya diverged from other principal domains early in Earth history. Nonetheless, at present, the oldest fossils that can be assigned to an extant eukaryotic clade are filamentous red algae preserved in ca. 1200 Ma cherts from Arctic Canada. Between these records lies a rich assortment of potentially protistan microfossils. Combined light microscopy, scanning electron microscopy, and transmission electron microscopy on 1500‐1400 Ma fossils from the Roper Group, Australia, and broadly coeval rocks from China show that these intermediate assemblages do indeed include a moderate diversity of eukaryotic remains. In particular, preserved cell wall ultrastructure, observed using transmission electron microscopy (TEM), can help to bridge the current stratigraphic gap between the unambiguous eukaryotic morphologies of later Proterozoic assemblages and molecular biomarkers in much older rocks. Article in Journal/Newspaper Arctic Wiley Online Library Arctic Canada Roper ENVELOPE(162.750,162.750,-78.117,-78.117) Geobiology 2 3 121 132 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT Biomarker molecular fossils in 2770 Ma shales suggest that the Eucarya diverged from other principal domains early in Earth history. Nonetheless, at present, the oldest fossils that can be assigned to an extant eukaryotic clade are filamentous red algae preserved in ca. 1200 Ma cherts from Arctic Canada. Between these records lies a rich assortment of potentially protistan microfossils. Combined light microscopy, scanning electron microscopy, and transmission electron microscopy on 1500‐1400 Ma fossils from the Roper Group, Australia, and broadly coeval rocks from China show that these intermediate assemblages do indeed include a moderate diversity of eukaryotic remains. In particular, preserved cell wall ultrastructure, observed using transmission electron microscopy (TEM), can help to bridge the current stratigraphic gap between the unambiguous eukaryotic morphologies of later Proterozoic assemblages and molecular biomarkers in much older rocks. |
format |
Article in Journal/Newspaper |
author |
JAVAUX, EMMANUELLE J. KNOLL, ANDREW H. WALTER, MALCOLM R. |
spellingShingle |
JAVAUX, EMMANUELLE J. KNOLL, ANDREW H. WALTER, MALCOLM R. TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans |
author_facet |
JAVAUX, EMMANUELLE J. KNOLL, ANDREW H. WALTER, MALCOLM R. |
author_sort |
JAVAUX, EMMANUELLE J. |
title |
TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans |
title_short |
TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans |
title_full |
TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans |
title_fullStr |
TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans |
title_full_unstemmed |
TEM evidence for eukaryotic diversity in mid‐Proterozoic oceans |
title_sort |
tem evidence for eukaryotic diversity in mid‐proterozoic oceans |
publisher |
Wiley |
publishDate |
2004 |
url |
http://dx.doi.org/10.1111/j.1472-4677.2004.00027.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1472-4677.2004.00027.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1472-4677.2004.00027.x |
long_lat |
ENVELOPE(162.750,162.750,-78.117,-78.117) |
geographic |
Arctic Canada Roper |
geographic_facet |
Arctic Canada Roper |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Geobiology volume 2, issue 3, page 121-132 ISSN 1472-4677 1472-4669 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1472-4677.2004.00027.x |
container_title |
Geobiology |
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2 |
container_issue |
3 |
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121 |
op_container_end_page |
132 |
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1809894616811438080 |