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Are the valve tappets roller type or just tappet and cam direct contact?

Series 60 is a roller rocker engine. Valve rollers are steel and injector rollers are ceramic type material.

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Just wanted to post an update and any input from this knowledgeable group.
Here is pic of inside the oil pan as the shop has just taken off. They will be accessing the upper rocker area in the next couple days (not easy). It is accessed from the rear closet. Anyone had experience in knowing what might be "suspect" location of internal issue with this type of "galled" product in the oil pan?

Material is very interesting, not seen something like this in an engine. Appears almost to me like what we see when metal bus vaporizes in an electrical arc fault.