Lamarck is a
crater
Crater may refer to:
Landforms
*Impact crater, a depression caused by two celestial bodies impacting each other, such as a meteorite hitting a planet
*Explosion crater, a hole formed in the ground produced by an explosion near or below the surfac ...
in the southwestern part of the
Moon
The Moon is Earth's only natural satellite. It is the fifth largest satellite in the Solar System and the largest and most massive relative to its parent planet, with a diameter about one-quarter that of Earth (comparable to the width of ...
. The northern portion of the crater is overlain by the walled plain
Darwin. To the southeast is
Byrgius.
The outer wall of this formation has been heavily damaged by subsequent impacts, leaving a disintegrated rim that forms a low, irregular ridge in the surface. Parts of the crater are also overlain by ejecta from the
Mare Orientale
Mare Orientale (Latin ''orientāle'', the "eastern sea") is a lunar mare. It is located on the western border of the near side and far side of the Moon, and is difficult to see from an Earthbound perspective. Images from spacecraft have reveale ...
basin to the east. The most notable feature in the interior is the tiny, bowl-shaped impact crater Lamarck B. The remainder of the floor forms a rolling, uneven plain.
Attached to the southwestern rim is Lamarck A, a large but equally disintegrated crater. Lamarck D is a huge formation that lies to the west of Lamarck A. However, this last feature is also worn to the point where it is barely recognizable as a crater.
Satellite craters
By convention these features are identified on lunar maps by placing the letter on the side of the crater midpoint that is closest to Lamarck.
File:Lamarck D crater 4173 h1.jpg, Lamarck D
References
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Impact craters on the Moon
Jean-Baptiste Lamarck