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Table T8. XRD mineralogy by unit. (See table note.)

Mineral Maximum Minimum Average Standard
deviation
Subunit IIC
Clay 54.1 38.0 48.4 4.8
Quartz 28.6 19.7 23.6 2.3
Plagioclase 39.5 22.7 27.1 3.8
Calcite 4.0 0.0 0.9 1.4
Calcite 4.0 0.3 2.3 1.3
Subunit IID
Clay 62.1 49.4 54.4 4.1
Quartz 21.9 13.2 20.1 3.1
Plagioclase 31.3 16.8 24.2 4.5
Calcite 5.8 0.0 1.3 2.2
Calcite 5.8 1.1 3.1 2.4
Unit III
Clay 68.2 61.2 64.8 2.0
Quartz 21.1 17.8 19.4 1.1
Plagioclase 19.0 11.5 15.3 1.9
Calcite 4.3 0.0 0.4 1.0
Calcite 4.3 0.6 1.8 1.5

Note: For each subunit, calcite results are first presented for all samples and then for only those samples containing calcite.

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