Soils, Minerals, Wood, & Other Vegetative Matter bsapp.com.
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Transcript of Soils, Minerals, Wood, & Other Vegetative Matter bsapp.com.
SoilAny material, both natural
and artificial, that lies on or near the Earth's surface
Most of this evidence is only useful as support or lead generating
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Examination of SoilThroughout the examination of soil an observer must:
Look for trace evidenceCompare the physical and chemical properties of each sample to a control sample
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Matching Soil Samples
Two samples are considered to be the
same if and only if they match on each and every level of the
following tests
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Dry Samples & Pulverize
Dirt changes shade and color at different moisture levels
Dried dirt may clot
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UV-Observations Note the shape, size, number, and
identity (if possible) of any material that fluoresces
Compare Samples
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Place only a small amount of sample on the slide at a
time. Be sure the dirt is placed only in the center of the slide so as not to
allow it to fall in the microscope.
WARNING
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Final Comparison Any and all foreign objects found
should be investigated separately If all previous comparisons are
similar between two samples they likely originate from the same area
As final comparison density gradient columns may be utilized
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Density Gradient Tubes
Assemble two identical density columns with varying levels of liquids in them
Drop equal amounts of soil samples (a control and unknown) in the columns
Allow the samples to disperse throughout the columns for comparison
If the two samples are of the same origin, then they will produce nearly identical gradient tubes
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