When the Chicxulub asteroid obliterated non-avian dinosaurs 66 million years ago, it abruptly terminated the Mesozoic Era and initiated the third great chapter of complex terrestrial life: the Cenozoic Era — the Age of Mammals. Spanning from the Cretaceous-Paleogene extinction boundary to the modern day, the Cenozoic is our geological home. Across its 66-million-year arc, … Read more

Spanning an immense chronological expanse of nearly 186 million years — from 251.9 million years ago to 66.0 million years ago — the Mesozoic Era is universally celebrated as the Age of Reptiles. Yet to define this profound geological era merely as the dominion of dinosaurs is to overlook the fundamental structural, climatic, and biological … Read more

Throughout the 540-million-year history of complex multicellular life, our planet has weathered five monumental mass extinction events — the catastrophic ‘Big Five.’ Yet among these global cataclysms, one event stands so terrifyingly colossal in its scale of biological devastation that paleontologists universally refer to it as The Great Dying: the Permian-Triassic (P-Tr) Mass Extinction, which … Read more

For the first three billion years of Earth’s biological chronology, life remained almost exclusively microscopic, unicellular, and marine — an endless expanse of cyanobacterial mats, simple prokaryotes, and primitive microbial ecosystems. Even the emergence of the enigmatic, frond-like Ediacaran biota in the late Neoproterozoic presented soft, quilted organisms that largely lacked active digestive systems, predatory … Read more