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Figure 4-1. Photomicrograph and mercury-injection curves (MICP) of six shale types.

A. Shale type 1, which is well-laminated and slightly silty shale.

B. Shale type 2, which is laminated and moderately silty shale.

C. Shale type 3, which is mottled and moderately silty shale.

D. Shale type 4, which is mottled, very silty shale.

E. Shale type 5, which is interlaminated shale and siltstone.

F. Shale type 6, which is slightly silty and calcareous claystone.

G. Graphs of mercury-injection curves (MICP) at 10% nonwetting saturation (PSIA) for the six shale types.