Figure 188

 Click here for larger NASA image of Figure 185
 Click here for larger NASA image of Figure 188
 Click here for lunar chart showing location

The pile of volcanic rocks that surround the crater at the head of Schroter's Valley has been called the Cobra Head. The crater is 40 km in diameter, the pile of volcanic rocks is 100 km in diameter. The abundant secondary craters on the volcano and the channel show that the crater Aristarchus, from which they were thrown, is younger than Schroter's Valley. The straight line segments of the valley that turn at sharp angles show that the basic form of the valley has been made by faulting, or breaks, in the lunar crust. The sinuous, meandering valley indicates that the basic straight valley shape has been modified heavily by later lava flows coursing down the valley. Samples returned by Apollo 15 from the side of a similar valley, Rima Hadley, strongly indicate that the rocks in the valley walls are basaltic lava flows. The rocks are layered because of the flow and have many holes (vesicles) formed by gas escaping from the rocks when they were still molten.   -H.M.

Report Source: NASA SP-362, Page 182, Figure 188

This web page was created by Francis Ridge for The Lunascan Project
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