I see them in the photo you linked, on their pedestals or stems. The smaller ones seem like more clear cut cases, very spherical, and their color is lighter than the matrix with this filter.

But here are some more in the micro images. This is very open to debate (i.e . I'm not sure), but what I see, is three eroded spheres lower down in the picture. I think these are reworked spheres. The same as the older, rubble-ized spheres seen at Meridiana, but here, they have been incorporated into a sandstone, and now, eroded out a second time. The rock seems largely composed of nodules. If these are sphere rubble, then the Hematite level will be high. Hopefully, we will get info on that one.