The term "trap" entered geological vocabulary between 1785 and 1795, borrowed from Swedish miners who saw stair-step landscapes in eroded basalt. In Siberia, that staircase stretches across a region larger than Western Europe. The Putorana Plateau, a UNESCO World Heritage Site in the northern part of the formation, preserves the stepped profile most dramatically: flat-topped mountains separated by deep canyons, each horizontal layer representing a separate lava flow that cooled and solidified before the next one buried it. The main rock is basalt, but the presence of both mafic and felsic types indicates that the eruptions were not a single event but a complex series of overlapping volcanic episodes. Geologists divide the traps into sections based on their chemistry, stratigraphy, and petrography, reading them the way historians read layers of an archaeological dig.

The Permian-Triassic extinction event, sometimes called the Great Dying, eliminated roughly 90% of marine species and 70% of terrestrial vertebrate species. It was not the lava itself that killed. The eruptions pumped enormous volumes of carbon dioxide, sulfur dioxide, halogens, and heavy metals into the atmosphere, setting off a cascade of environmental catastrophes. Global temperatures spiked. Oceans lost their oxygen and turned acidic. The ozone layer thinned, bathing land surfaces in ultraviolet radiation. Acid rain stripped vegetation from hillsides. The timing was devastating: the eruptions straddled the boundary between the Permian and Triassic periods, around 251.9 million years ago, and sedimentary records show that the extinction unfolded in slightly different sequences on land and in the sea, as each ecosystem reached its breaking point at a different moment.

Linking the Siberian Traps definitively to the extinction required decades of detective work. Scientists used chemical abrasion thermal ionization mass spectrometry, known as CA-TIMS, to date zircon crystals found within the trap rocks with extraordinary precision. By eliminating variability caused by lead contamination, researchers could focus on uranium decay within the zircons, pinpointing the age of volcanic layers to within tens of thousands of years across a 252-million-year span. Argon-argon dating of basalt and gabbro samples from both the Siberian Traps and surrounding regions confirmed that the volcanism and the extinction overlapped in time. Nickel deposits within the traps provided another line of evidence, since the magmatism timeline matched the extinction timeline, reinforcing the case that these eruptions were not just coincidental but causal.

Flying over central Siberia today, the Siberian Traps reveal themselves as a vast, flat terrain punctuated by plateau edges and canyon walls. The Putorana Plateau rises sharply above the surrounding lowlands, its table-topped mountains laced with waterfalls that plunge into glacially carved valleys. Rivers cut through the basalt in winding gorges. In winter, the region disappears under snow and darkness; in summer, the midnight sun illuminates a wilderness of lakes, tundra, and taiga that stretches to every horizon. The volcanism that built this landscape also left behind economically significant nickel and copper deposits, particularly around Norilsk, one of the most polluted cities on Earth. The deep connection between geological violence, ecological catastrophe, and modern industrial exploitation makes the Siberian Traps a place where the past and the present remain uncomfortably intertwined.