Another key to the pattern of this
first expansion is the aforementioned configuration of the three
plates of the seabeds of Central America. These three extensional
plates push the continents of North and South America outwards and
upwards, creating compressional fault lines along the west coasts
of both continents.
The sliding and extensional faults of Central America are the hinge
between the two landmasses. This hinge is at the antipode of the
original impact and entry point, the Himalayas.
Note: see Plate-Tectonic sub-section ( ptss
) for 'Sliding' and 'Compressional' faults, and 'Extensional Plates'.