How deep is regolith
How deep is the regolith around this crater?
I'm trying to estimate the depth of the ground around this 300 m long crater about 150 m from the lip of the Lalande crate on the equator of the moon. In the picture below from the camera of the LRO the angle of incidence of the sun is 65 O (it's 25 O over the horizon). This picture shows that the crater lacks a bottom that Reglith was loose and deep enough to collapse and fill in after impact. In this flat angle of the sun, the sun also reaches everything. Based on this, I estimate that the crater on the darker side has an inclination of no more than maybe 15 °. So the crater is about 35 to 40 m deep and there is no evidence that it penetrates a layer of coarser or denser regolith.
Here it is a little higher in the context of Lalande and with the sun, in the area where it is shown. The picture is a screenshot of the Quickmap service. You can use this link to go directly to the point on the map.
In this one I traced a ridge a few hundred meters from the lip that indicates where denser or firmer material begins. I couldn't find the LROC image file for the right side that the small crater is on, so I don't know the angle of incidence of the sun, but it looks like the sun was a bit higher. The wall of Lalande is in deep shadow in this corner of the sun, so the slope there is at least as steep - a little over 30 ° between the lip and the first crest. The ridge is therefore over 100 m below the crater lip.
Can it be concluded from this that the fine-grained upper regolith layer in this area near the Lalande lip is over 100 m deep?
Using the method suggested by @ TildalWave to estimate the depth of the regolith, I looked for boulders penetrating the surface layer. There are a few of them:
Most notable, however, are the large (~ 10 m) boulders on the northern rim of the crater. They seem to be in a fairly shallow place so I would say the bottom depth is no more than a few meters.
So close to the Lalande crater, the crater must have been created later, which has a "dusty" impact on the deposits of the much larger event that produced Lalande.
I assume that boulders must lie on solid rock.That can be terribly wrong.
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