Mean Grain Size of Lunar Regolith by Depth
| Sample Depth || Mean Grain Size <|
| ~0 || 80 |
| 4 || 68 |
| 7 || 93 |
| 12 || 75 |
| 17 || 75 |
| 22 || 85 |
| 28 || 110 |
| 34 || 90 |
| 40 || 90 |
| 46 || 103 |
| 48 || 109 |
| 54 || 139 |
| Average || 93 |
Sizes are approximate, measured in microns.
Reference: the Lunar Sourcebook
The data is from the Apollo 15 site, about 20 m away from the rim of
Hadley Rille, where the regolith is relatively thin and immature. The
numbers themselves are from drive-tube core 15010/11, with simple
locations and and mean grain sizes for individual samples. The core
penetrates the upper 60 cm of a 1 m thick reolith.
This sample is closer then usual to the bedrock, and there is
continuous mass wasting into the rille, so the median grain size is
larger then samples collected elsewhere.
Features of this sample which appear to be consistent among other
samples are the three peaks and troughs in particle size, although the
depth at which these characteristics appear may vary by a decimetre
either way (the features appear to be compressed in this sample). The
lower depths appear to be unrepresentative, probably due to the close
proximity of bedrocks.
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