Starship Asterisk*

From the structure an presence of cross bedding of the matrix in which the spheres are enclosed, I would guess that these are Oolites - calcium, phosphate or even haematite formed by accretion around a seed, ususually a sand grain. On earth ooids form in shallow lakes subject to current action, whic...

Based on their form and apearance, plus the obvious current bedding between the spheres, I would say that they are most propably Oolites. Ooids can be composed of Calcium (Aragonite), phosphate, or Haematite. Their formation is caused by chemical precipitation and accretion around a seed particle, o...

As a geologist, I find this image very intriguing. Flat lying strata comprising the Mesas shows no evidence of deformation, indicating that the deposits that formed the Mesas were laid down during a period of no tectonic activity (at least in the Arabia Terra region), with folding and faulting absen...