Biblis Tholus
Biblis Tholus is an extinct Martian volcano located at , one of two volcanoes near the center of the Tharsis volcanism. Along with Ulysses Tholus, it is almost midway between Olympus Mons and the Tharsis Montes. Biblis Tholus lies in the Tharsis quadrangle. It is approximately long and wide, rising about from its surroundings. In the middle of the volcano is a caldera, named Biblis Patera, believed to have formed as the result of collapse of the magma chamber during eruptions of the volcano. The caldera is in diameter and four kilometers (2.5 miles) in depth. Biblis Tholus Biblis