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Clay soil sticks together. Photo by Lynn Ketchum.

Like diamonds, clay soils are forever

Researchers collected and analyzed permafrost from four sites in the Yukon to develop a new technique to tease ancient DNA from soil, pulling the genomes of hundreds of extinct animals and thousands of plants from less than a gram of sediment. Credit: Tyler Murchie/ McMaster University

Thousands of species recorded in a speck of soil

-A grain-size comparator chart (to scale). The chart shows the different size fractions from silt (63 µm) through to large cobbles (128256 mm). Such charts are useful for field comparisons.

Grain Size : What is Grain Size? How is Grain Size...

Types of Rocks

From rocks in Colorado, evidence of a ‘chaotic solar system’

Study tracks ‘memory’ of soil moisture

Report calls for improved methods to assess earthquake-caused soil liquefaction

Marine sediments record variations in the Earth’s magnetic field

Study finds Earth’s soils hosted life early

Evidence of first chief indicates Pacific islanders invented a new society...

Modeling the contractive behavior of soft clay in a heating test

Soil will absorb less atmospheric carbon than expected this century, study...

New analyses of Martian chemical maps suggest water bound to sulfates...

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