Mars Express captured this view of White Rock on Mars on December 25, 2004. The resolution of the full-size image is 100 meters per pixel. The small "outliers" of White Rock material first noted in Mars Odyssey THEMIS images are clearly visible in a small crater to the southeast of the main White Rock deposit.
Freie Universität Berlin and DLR Berlin
White Rock and environs from Mars Express HRSC
This image of White Rock was taken through the panchromatic (nadir-pointing) filter on Mars Express' HRSC camera on December 25, 2004. The wide area covered by the HRSC image also takes in some interesting craters on the rim of Pollack, including a small crater, about 100 meters in diameter, with a bright floor. Could this be more of the White Rock material, sitting at an elevation much higher than the floor of Pollack crater?
Original image data dated on or about December 25, 2004