Nakhlite

Nakhlites are igneous rocks that are rich in augite and were formed from basaltic magma about 1.3 billion years ago.

Their crystallization ages, compared to a crater count chronology of different regions on Mars, suggest the nakhlites formed on the large volcanic construct of either Tharsis, Elysium, or Syrtis Major Planum.

[2] It has been shown that the nakhlites were suffused with liquid water around 620 million years ago and that they were ejected from Mars around 10.75 million years ago by an asteroid impact.

[1] A 6.5 km diameter crater at 29°40′26″N 130°47′56″E / 29.674°N 130.799°E / 29.674; 130.799 in the volcanic plains to the northwest of Elysium Mons has been identified as a possible source.

Based on the crater dimensions, the inferred growth rate of the source volcano during that interval is 0.4–0.7 m per Ma, far slower than would be expected for a terrestrial volcano, and implying that Martian volcanism had slowed greatly by that point in history.