Oldest marsupial, prehistoric

According to Official Guinness Records,

The oldest known relative of all marsupials is Sinodelphis szalayi, a fossil of which was discovered in Liaoning Province, China in 2001 and dated to 125 million years old. A Sino-American research team, including Ji Qiang and Zhe Xi Luo (both China), named the fossil and concluded it measured 15 cm (5.9 in) long and weighed 30 g (1.05 oz) approximately. The fossil dates marsupials as 50 million years older than skeletal remains of marsupial relatives which exist. http://www.carnegiemnh.org/research/sinodelphys/index.htm

For a complete list of 2001 records, please visit 2001 Guinness Records in China.

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