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post Feb 23 2017, 07:24 PM
Post #466

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I'm assuming the slabs composed of (bulk) basalt, and the surface layers consisting of (finer grained) regolith. The regolith should erode much faster than basalt.
Therefore, I've assumed the slabs being ejected fragments of a basalt layer beneath the surface regolith.
The slabs cannot be very young, since they are partially covered with cratered regolith, and there is no obvious sign of the slabs having impacted recently. Therefore they should be considerably harder (resistant to erosion) than the other material around.

Just one scenario.
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