First Mammaliaforms Emerge
225 Million years ago · Prehistoric
Approximately 225 million years ago, the first mammals appeared on Earth during the Late Triassic period. Tiny shrew-like creatures like Brasilodon quadrangularis and Morganucodon, whose fossils have been found in Brazil and Wales respectively, were among the earliest true mammals. These small creatures coexisted with some of the oldest dinosaurs and represent a crucial evolutionary transition.
Key Figures
Martha RichterMoya Meredith SmithWalter Georg KühneSergio F. Cabreira
Locations
Caturrita FormationGlamorgan, Wales
Topics
cosmologysciencespacelife
Connected Events — 3 Connections
Herrerasaurus and early mammaliaforms were contemporaries in the Late Triassic, competing within the same terrestrial ecosystems Herrerasaurus: Triassic Theropod Predator
Mongol expansion that destroyed Baghdad also opened the Silk Road trade routes that later carried plague-infected fleas from Central Asia to Europe, with Mongol military campaigns and enhanced trade networks creating the very pathways the Black Death would follow westward Siege of Baghdad
Habitat fragmentation from the collapse drove the diversification of early amniotes, whose lineage eventually produced the first mammaliaforms 80 million years later Carboniferous Rainforest Collapse
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