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There are fossils but only tiny bits. Limestone is sedimentary so those creatures that could be arsed to die in it will be readily found. Marble is metamorphic, formed when the sedimentary limestone is naturally heated and under pressure during rock formation and the calcium carbonate grains recrystallise, the fossil fragments, originally in the limestone, are there but damaged and tiny.A good reason for not seeing them would be that a fossil visible in a piece of marble used for decorative stonework would be seen as a flaw and likely to be rejected.The purest marbles (required by sculptors) come from the tops of deposits such as at Carrara in Italy - the stone used by Michelangelo for his David.
Have a look at:http://en.wikipedia.org/wiki/Marble#Origins
Marble is a metamorphic rock resulting from regional or rarely contact metamorphism of sedimentary carbonate rocks, either limestone or dolostone, or metamorphism of older marble. This metamorphic process causes a complete recrystallization of the original rock into an interlocking mosaic of calcite, aragonite and/or dolomite crystals. The temperatures and pressures necessary to form marble usually destroy any fossils and sedimentary textures present in the original rock."
Never found any fossils in my marbles either  [attachment=4388]must have lost my marbles, can't seem to find them anywhere