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Opal-CT is the only diagenetic silica phase present in the Santa Cruz Mudstone within a 16 Km long area extending from the city of Santa Cruz north to Davenport, California. The d(101)-spacing values of opal-CT range from 4.11 Angstroms in outcrops within the city of Santa Cruz area, to 4.06 Angstroms in outcrops north of Santa Cruz. Associated with the decrease in d-spacings, the morphology of crystallites making up rosettes of opal-CT (lepispheres) varies from feathery in high d-spacing samples to spiny in low d-spacing samples. The extent of silica diagenesis in the Santa Cruz Mudstone suggests the unit...

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