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Coarse-grained, medium-to thick-bedded turbidites in the Franciscan Complex contain carbonized plant debris concentrated in the upper parts of some of the beds. These concentrations typically occur at the top of a thick , graded to massive sand subdivision, and may be covered by a thin, parallel-laminated silt or silty sand subdivision. Plant fragments are usually angular, vary greatly in size and shape, and do not display obvious signs of current orientation. The largest fragments (> 1 em infatcat:dvrd44cqrzbrhjycjucsyxusqm