East African Orogeny is the Neoproterozoic

Neoproterozoic

The Neoproterozoic Era is the unit of geologic time from 1,000 to 542.0 ± 1.0 million years ago. The terminal Era of the formal Proterozoic Eon , it is further subdivided into the Tonian, Cryogenian, and Ediacaran Periods...

 orogeny

Orogeny

Orogeny refers to forces and events leading to a severe structural deformation of the Earth's crust due to the engagement of tectonic plates. Response to such engagement results in the formation of long tracts of highly deformed rock called orogens or orogenic belts...

 that affects the East African Orogen. The orogeny evolved from an accretionary

Accretion (geology)

Accretion is a process by which material is added to a tectonic plate or a landmass. This material may be sediment, volcanic arcs, seamounts or other igneous features.-Description:...

 orogeny involving the amalgamation of arcs and evolved into a collisional orogeny when the Neoproterozoic continent Azania

Azania

Azania is the name that has been applied to various parts of sub-Saharan Africa. In Roman times—and perhaps earlier—the name referred to a portion of the Southeast African coast south of the Horn of Africa, extending south perhaps as far as modern Tanzania....

 collided with the Congo-Tanzania-Bangweulu Block at ~640 Ma. The orogeny is the earlier of two orogenies that affects the East African Orogen and is followed by the Ediacaran

Ediacaran

The Ediacaran Period , named after the Ediacara Hills of South Australia, is the last geological period of the Neoproterozoic Era and of the Proterozoic Eon, immediately preceding the Cambrian Period, the first period of the Paleozoic Era and of the Phanerozoic Eon...

-Cambrian

Cambrian

The Cambrian is the first geological period of the Paleozoic Era, lasting from Mya ; it is succeeded by the Ordovician. Its subdivisions, and indeed its base, are somewhat in flux. The period was established by Adam Sedgwick, who named it after Cambria, the Latin name for Wales, where Britain's...

 Malagasy Orogeny

Malagasy Orogeny

Malagasy Orogeny is the name given to the Ediacaran to Cambrian orogeny that resulted as India collided with the already amalgamated African continent that consisted of Azania and the Congo-Tanzania-Bangweulu Block. The orogeny affects the parts of the East African Orogen that are now found in...

.