Discussion
Pettijohn proposed the "Fluidity Index" based on :
Answer: A
Pettijohn's fluidity index is based on matrix-rich wacke versus matrix-poor arenite.
In Pettijohn's sandstone classification, the proportion of clay matrix reflects the fluidity (viscosity) of the depositing medium: turbid, dense flows leave matrix-rich wackes, while clean, fluid currents winnow matrix away and leave arenites.
The other options are his other two indices. The ratio of quartz to feldspar plus rock fragments is the maturity index (option C), and the ratio of rock fragments to feldspar is the provenance index (option B). Accessory minerals against micas and clays is not one of his indices.
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