Geological Chronicle
Maclaurin lies across the eastern quadrant of the lunar near side, situated southeast of Mare Spumans and northeast of Langrenus. The impact crater measures 54.33 kilometers across and maintains a generally circular outline despite significant structural crowding along its exterior perimeter.
A notable network of secondary formations borders the crater walls. Lava-flooded craters Maclaurin O and Maclaurin K line the northern crest, while additional satellite craters cling to the northeastern, eastern, and southern ramparts. At the southern rim, intrusions from three neighboring craters, including Maclaurin A and Maclaurin N, have compressed the wall and flattened that margin, leaving open spans primarily along the western and southeastern rim.
Within the rim crest, inner walls descend along gentle slopes toward a flat interior floor. The central section displays a darker hue indicative of lower albedo, where resurfacing, possibly by basaltic lava, coated the basin floor around a low central ridge.