US D578725 S1
The ornamental design for a memorial marker, as shown and described.
FIG. 1 is a perspective view of my new design;
FIG. 2 is a top view of my new design;
FIG. 3 is a bottom view of my new design;
FIG. 4 is a side view of my new design; and,
FIG. 5 is an end view of my new design.
The broken line showing of portions of the memorial marker is included for the purpose of illustrating environment and forms no part of the claimed design.