Figure F30. Selected core photographs illustrating facies encountered in each of the units. A. Turbidites in the upper fan sequence. B. Upper hemipelagic interval containing ash layer Y8 (Drexler et al., 1980; Mallarino et al., in press). Inset shows a microphotograph of the volcanic glass silt and sand. C. Thin-bedded turbidites in the lower fan sequence. D. Lower hemipelagic interval at the base of Brazos-Trinity Basin #4. E. Laminated and bioturbated mud in the prefan sequence.