Hecates Tholus is a Martian volcano, notable for results from the European Space Agency's Mars Express mission which indicate a major eruption took place 350 million years ago.

[4] In 2004, ESA's High Resolution Stereo Camera and NASA's Thermal Emission Imaging System both took pictures of the region from orbit.

It has been shown that the age of the glaciers correspond to a period of increased obliquity of Mars' rotational axis.

[8] The western flank is expected to have been resurfaced in the Late Amazonian period, due to its lack of craters relative to the rest of the volcano.

[1] While craters are useful in dating Martian volcanos, it has proven difficult to apply this method too Hecates Tholus.