Ulysses Patera
Ulysses Patera lies just east of Biblis Patera. It is also located near
the middle of Tharsis volcanism, and it has been buried by lavas from
Pavonis Mons. It is about 100 km in diameter and is about 2-3 km tall. The
central caldera is nearly 56 km across . Like Biblis Patera, Ulysses
Patera is surrounded by younger lava flows. It is also cut by a few
graben. The most striking features on this volcano, however, are two large
impact craters. These craters overlap the caldera and clearly postdate all
major volcanism at this site. Large craters are rare outside of the
cratered uplands on Mars. Thus, the presence of two such craters on
Ulysses Patera is highly unusual. This volcano appears to be very old. It
has an estimated age of ~3.4 billion years. (VIking Orbiter images 49B68,
49B70 & 49B85, from Plescia (1994) Icarus, vol. 111.)
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