scholarly journals Supplemental Material: Curation and analysis of global sedimentary geochemical data to inform Earth history

2021 ◽  
Author(s):  
Akshay Mehra
Keyword(s):  
Geochemical Data ◽  
Analytical Uncertainty ◽  
Earth History ◽  
Sensitivity Tests

Table of valid lithologies; map depicting sample locations; crossplot illustrating analytical uncertainty; flowchart of the proposed workflow; histograms showing the effects of progressive filtering, the distribution of spatial and age scales, and proximity and probability values; and results of parameters sensitivity tests.

scholarly journals Supplemental Material: Curation and analysis of global sedimentary geochemical data to inform Earth history

2021 ◽  
Author(s):  
Akshay Mehra
Keyword(s):  
Geochemical Data ◽  
Analytical Uncertainty ◽  
Earth History ◽  
Sensitivity Tests

(i) table of valid lithologies; (ii) map depicting sample locations; (iii) crossplot illustrating analytical uncertainty; (iv) flowchart of the proposed workflow; (v) histograms showing the effects of progressive filtering, the distribution of spatial and age scales, and proximity and probability values; and (vi) results of parameters sensitivity tests.

scholarly journals Supplemental Material: Curation and analysis of global sedimentary geochemical data to inform Earth history

2021 ◽  
Author(s):  
Akshay Mehra
Keyword(s):  
Geochemical Data ◽  
Analytical Uncertainty ◽  
Earth History ◽  
Sensitivity Tests

Table of valid lithologies; map depicting sample locations; crossplot illustrating analytical uncertainty; flowchart of the proposed workflow; histograms showing the effects of progressive filtering, the distribution of spatial and age scales, and proximity and probability values; and results of parameters sensitivity tests.

scholarly journals Curation and Analysis of Global Sedimentary Geochemical Data to Inform Earth History

GSA Today ◽  
2021 ◽  
Author(s):  
Akshay Mehra ◽  
C. Keller ◽  
Tianran Zhang ◽  
Nicholas Tosca ◽  
Scott McLennan ◽  
...  
Keyword(s):  
Geochemical Data ◽  
Earth History

scholarly journals Fossil evidence of Archaean life

2006 ◽  
Vol 361 (1470) ◽  
pp. 869-885 ◽  
Author(s):  
J. William Schopf
Keyword(s):  
Geochemical Data ◽  
Earth History ◽  
Fossil Evidence

Evidence for the existence of life during the Archaean segment of Earth history (more than 2500 Myr ago) is summarized. Data are presented for 48 Archaean deposits reported to contain biogenic stromatolites, for 14 such units reported to contain 40 morphotypes of putative microfossils, and for 13 especially ancient, 3200–3500 Myr old geologic units for which available organic geochemical data are also summarized. These compilations support the view that life's existence dates from more than or equal to 3500 Myr ago.

LITTLE ICE AGE IN THE EARTH HISTORY AND ITS POSSIBLE REASONS

2020 ◽  
Vol 42 (1) ◽  
pp. 4-12
Author(s):  
Valeriy Fedorov ◽  
Denis Frolov
Keyword(s):  
Little Ice Age ◽  
Ice Age ◽  
Earth History ◽  
The Earth

National geochemical data base; PLUTO geochemical data base for the United States

Data Series ◽  
10.3133/ds47 ◽  
1998 ◽  
Author(s):  
Philip A. Baedecker ◽  
Jeffrey N. Grossman ◽  
Kim P. Buttleman
Keyword(s):  
United States ◽  
Data Base ◽  
The United States ◽  
Geochemical Data
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