  In this paper we attempt to explicate Salmon's idea of a causal process, as
defined in terms of the mark method, in the context of C*-dynamical systems. We
prove two propositions, one establishing mark manifestation infinitely many
times along a given interval of the process, and, a second one, which
establishes continuous manifestation of mark with the exception of a countable
number of isolated points. Furthermore, we discuss how these results can be
implemented in the context of Haag-Araki theories of relativistic quantum
fields in Minkowski spacetime.
