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The lava flows shown here are substantially larger than the individual flows visible on the shield volcanoes (slides #3 and #6); shadow lengths indicated flow thicknesses in excess of 50 m (164 ft) at many places. The flows have a smooth upper surface (at the resolution of these images) and they lack the leveed central channel common on many of the shield volcano flows. The plains over which the flows have been emplaced include areas that appear to be etched by some flowing liquid (see arrow). It is possible that the eroding liquid was water, perhaps released from the ground by the heat of the lava flows. 46 N, 115 W; Viking Orbiter frames 252S01, 3, 5, 32, 34, and 36, high-pass spatially filtered orthographic version. Right click here to download a high-resolution version of the image (2.11 MB)
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