Results 161 to 170 of about 8,490 (221)
Cold low-latitude Ordovician paleotemperatures may be in hot water. [PDF]
Proc Natl Acad Sci U S AGrossman EL +5 more
europepmc +1 more source
Chemical identification of microfossils from the 1.88‐Ga Gunflint chert: Towards empirical biosignatures using laser ablation ionization mass spectrometer [PDF]
Journal of Chemometrics, 2021 In this contribution, we investigated the chemical composition of Precambrianmicrofossils from the Gunflint chert (1.88 Ga) using a miniature laser ablationionization mass spectrometer (LIMS) developed for in situ space applications.Spatially resolved ...
Andreas Riedo +2 more
exaly +3 more sources
Animal origins: The record from organic microfossils
Earth-Science Reviews, 2022 Accumulated records of organic microfossils span billions of years of Earth history. The majority of this record consists of prokaryotes plus eukaryotes of a protistan grade, yet this type of fossilisation is also capable of capturing the organically ...
Madeleine Bohlin, Ben Slater
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Earth-Science Reviews, 1982
Microfossils are the tiny remains of bacteria, protists, fungi, animals, and plants. Microfossils are a heterogeneous bunch of fossil remains studied as a single discipline because rock samples must be processed in certain ways to remove them and microscopes must be used to study them.
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Microfossils are the tiny remains of bacteria, protists, fungi, animals, and plants. Microfossils are a heterogeneous bunch of fossil remains studied as a single discipline because rock samples must be processed in certain ways to remove them and microscopes must be used to study them.
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Nanoscale analysis of preservation of ca. 2.1 Ga old Francevillian microfossils, Gabon
Precambrian Research, 2017 International audienceThe FC Formation of the Francevillian of Gabon displays the oldest Gunflint-type assemblage of microfossils that is hosted in shallow-water stromatolites.
Alain Trentesaux +2 more
exaly +2 more sources
Short Courses in Paleontology, 1995
Sponges or Porifera are among the most primitive and simplest of metazoan organisms and have a long geologic record, based largely on mineralized skeletal elements termed spicules. Spicules, then, are of interest to micropaleontologists, and their study and interpretation provide opportunities for wide-based research by researchers ranging from student
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Sponges or Porifera are among the most primitive and simplest of metazoan organisms and have a long geologic record, based largely on mineralized skeletal elements termed spicules. Spicules, then, are of interest to micropaleontologists, and their study and interpretation provide opportunities for wide-based research by researchers ranging from student
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Journal of Sedimentary Research, 1958
Abstract The phenomena of horizontal and vertical displacement of microfossils are re-examined in the light of their increasing importance in correlation work and in paleoecologic studies. Size ranges of the common micropaleontological objects are tabulated and classified in terms of Wentworth's grade scale of sedimentary particles ...
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Abstract The phenomena of horizontal and vertical displacement of microfossils are re-examined in the light of their increasing importance in correlation work and in paleoecologic studies. Size ranges of the common micropaleontological objects are tabulated and classified in terms of Wentworth's grade scale of sedimentary particles ...
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Cellular Microfossils and Possible Microfossils in the Paleo- and Mesoarchean
2019Representative Paleo- and Mesoarchean (>3.0 Ga) microfossils and possible microfossils retaining cellular structures from the Pilbara Craton, Western Australia, and the Kaapvaal Craton, South Africa, are reviewed. Rod-shaped, spheroidal, lenticular, and filamentous (and their subtypes) microfossils have been identified in those areas, and their sizes ...
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1996
Abstract This chapter deals with calcareous microfossils. These generally range in size from 0.1-1.0 mm (though ‘larger’ benthonic foraminifera with complex inner structures range up to 10 cm in diameter). Preparation of samples for calcareous microfossil study generally consists of the disaggregation or thin-sectioning of the containing
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Abstract This chapter deals with calcareous microfossils. These generally range in size from 0.1-1.0 mm (though ‘larger’ benthonic foraminifera with complex inner structures range up to 10 cm in diameter). Preparation of samples for calcareous microfossil study generally consists of the disaggregation or thin-sectioning of the containing
openaire +1 more source