File:AS17-155-23717-23718 mosaic.jpg

English: This image is an approximate reconstruction of Figure 30-22 of the Apollo 17 Preliminary Science Report (SP-330, 1973). The area is west of Euler crater in Mare Imbrium. Numbers and scale bars in the original figure are not reproduced. The figure has the following caption:
Apollo 17 Hasselblad photographs AS17-155-23717 and 23718 showing the braided lava channels near the source vents of the phase III eruptives. Numbers (e.g., 24) are heights in meters measured at indicated points. The Sun elevation angle is approximately 1°.
The paragraph in the report that refers to the figure is as follows:
Subdued, 1- to 2-km-wide and 40- to 50-m-deep, leveed channels are present lengthwise along the center of the most extensive phase III flows (fig. 30-15). This type of lava channel is common in terrestrial basalt flows, but the lunar channels are several orders of magnitude larger. The braided lava channels in a complex series just north of the suggested phase III source vent are on the order of 400 to 800 m wide and 40 to 70 m deep (fig. 30-22). Lunar application of the equations of Shaw and Swanson (ref. 30-23) and Danes (ref. 30-24) has shown that, even on nearly horizontal slopes, the lunar flow heights and extreme lengths are in accord with calculated values when the reduced-gravity environment and the higher density of the basalt melt are considered (ref. 30-15). In addition, the high rates of lava extrusion appear to be the primary cause of extreme flow lengths; the reduced viscosity of lunar basalts (ref. 30-4) probably plays a secondary role.