Prior to the formation of a land bridge about 3 MYA, marsupials were diverse and abundant in SOUTH AMERICA. The western half of Gondwana separated from the eastern half million years ago.
Gondwana was a super landmass containing all continents that began to break up during the Jurassic.
The western half of Gondwana (i.e., Africa and South America) separated from the eastern half (i.e., India, Australia, and Antarctica) million years ago.
This separation led to the divergence of many taxonomic groups, including Australian marsupials and South American marsupials.
Some South American marsupials include, among others, Andean caenolestid, Chacoan gracile opossum, long-nosed caenolestid etc.
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