Curiosity rover explores stratigraphy of Gale crater

Gale Crater's central sedimentary mound (Aeolis Mons or, informally, Mount Sharp) is a 5.5-km-tall remnant of the infilling and erosion of this ancient impact crater. Given its thickness and age, Mount Sharp preserves one of the best records of early Martian climatic, hydrological, and sedimentary history.

source https://www.sciencedaily.com/releases/2021/04/210408152247.htm