Mid-ocean ridges (MORs), continued
In vicinity of ridge mountains or axial valleys, rare unconsolidated sediments and sedimentary rocks occur in thin, flat-lying layers
Thickness of sediment cover increases with distance from axial trough, but never exceeds 1.3 km
Sedimentary rocks may be cut by faults but are not deformed like sedimentary rocks in continental mountains
Age of the oldest sedimentary rock (lying on basalt) is greater at increasing distance from axial trough