Gai-As Formation
The Gai-As Formation is an Early to Middle Permian (Kungurian to Wordian) geologic formation correlated with the Ecca Group and designated "Ecca" Group, because it does not belong to the Karoo, in the southwestern Kunene Region and northern Erongo Region of northwestern Namibia. The Gai-As Formation represents the second-oldest sedimentary unit of the Huab Basin, overlying the Huab Formation. The formation was deposited in a fluvial to lacustrine setting.

The Gai-As Formation is correlated with a series of formations in the Pelotas and Paraná Basins in southeastern Brazil, deposited in a larger basinal area, 150 million years before the break-up of Pangea. The abundance of "Glossopteris" and "Mesosaurus" fossils in the underlying Huab Formation are characteristic of the Gondwanan correlation across present-day South America, Africa, Antarctica and Australia. The Gai-As Formation has provided fossil bivalves and an indeterminate stereospondylid.
Q642169
Early
Concept
Q1077376
Middle Permian
Concept
Q1073812
Kungurian
TIME
Q686803
Wordian
TIME
Q736917
formation
Concept
Q3467476
Ecca Group
MEDIA
Q916997
Karoo
LOC
Q834513
Kunene Region
LOC
Q648753
Erongo Region
LOC
Q1030
Namibia
LOC
None
Huab Basin
UNK
Q56284134
Huab Formation
LOC
Q1434465
fluvial
LOC
Q23397
lacustrine
Concept
Q39791256
Pelotas
UNK
Q1029718
Paraná Basin
LOC
Q4398
Pangea
LOC
Q1801472
Glossopteris
Concept
Q132822
Mesosaurus
Concept
Q80583
Gondwana
LOC
Q25368
bivalve
Concept
Q3495411
stereospondyli
Concept
Q56291338
Gai-As Formation
LOC
Q56291338
Gai-As Formation
LOC
Q56291338
Gai-As Formation
LOC
Q56291338
Gai-As Formation
LOC
instance of
located in the administrative territorial entity
country
underlies
country
country