The ornamental design of a marblepatternedfloatationdevice, as shown and described.
FIG. 1 is a perspective view of a marble patterned floatation device.
FIG. 2 is a front view thereof.
FIG. 3 is a rear view thereof.
FIG. 4 is a right-side view thereof.
FIG. 5 is a left-side view thereof.
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
The design features a donut-shaped marble patterned floatation device. The broken lines showing the seam connecting the top half of the floaty to the bottom half of the floaty as seen in FIGS. 1-5 forms no part of the claimed design.