Description: (Lyell)
Wrecked formation with irregular shape.
Pretty steep slopes supporting Lyell A to the North-West and Proclus
A to the East.
Pretty high walls with damaged part to the West.
Flat floor communicating with Mare Tranquillitatis to the West.
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Size: (Lyell)
Dimension: 32x32Km / 19x19Mi
Height: ?
Height/Wide ratio: Unknown height. Impossible calculation.
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Observation: (Lyell)
Interest : Very interesting formation
Observation period: 5 days after New Moon or 4 days after Full Moon
Minimal Instrument: 50 mm refractor
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