Abstract
A long-lived marine seaway between the Parnaiba and Parana basins occurred during a global marine transgression between Brazilian intracratonic basins (except for the Solimoes Basin) in the latest Eifelian/earliest Givetian (Middle Devonian). As a result of this transgression a catastrophic event (KACAK) in combination with the immigration of warm water Appalachian and Old World faunas contributed to the collapse of the Malvinokaffric Realm in the Parana Basin. In the Alto Garҫas and Apucarana sub-basins, the transgression is notable in the early Givetian with an impoverished shelly fauna following the KACAK post-extinction event in the earliest Givetian.
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