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Figure 22D. Thin-section photomicrograph of sidewall core sample from Eugene Island Block 330 (Plane polarized light: scale = 0.25 mm.) Fine-grained sandstone (subarkose). C, chert; F, plagioclase feldspar; P, pelecypod fragment; Q, quartz. LF sandstone. E.I. 330 #B-2, 8338 ft.