Science
🦴 Fossils & Paleontology Quiz
How fossils form, what they reveal, and the discoveries that rewrote history.
How fossils form, what they reveal, and the discoveries that rewrote history.
The Permian-Triassic extinction 252 million years ago — known as the "Great Dying" — wiped out 96% of all marine species and 70% of terrestrial vertebrate species. Life on Earth took roughly 10 million years to meaningfully recover. Fossils are the only window into that vanished world, and paleontology has transformed our understanding of evolution, climate, and the fragility of life. This quiz covers fossil formation, the giants of paleontological discovery, mass extinction events, and the prehistoric oddities locked in stone and amber.
Each round presents 10 randomized multiple-choice questions drawn from a pool of 50, so every playthrough is different. You get instant feedback with explanations after each answer, plus a shareable score at the end.
You'll explore how permineralization turns bone to stone, why less than 0.1% of species ever fossilize, the extraordinary finds from the Burgess Shale, what Lucy revealed about human origins, how the Chicxulub asteroid ended the reign of non-avian dinosaurs, and why Mary Anning's contributions were ignored for over a century. You'll also tackle trace fossils, amber preservation, the Big Five mass extinctions, and whether humanity is causing a sixth.
Most fossils form through permineralization: an organism dies and is rapidly buried by sediment, cutting it off from oxygen and scavengers. Over millions of years, groundwater carrying dissolved minerals seeps through the porous bone or shell, and those minerals crystallize inside the cells, gradually replacing organic material with rock. The ideal conditions — rapid burial, low oxygen, fine-grained sediment, and the right chemistry — are rare, which is why less than 0.1% of species that have ever lived left any fossil record at all.
The oldest generally accepted fossils are stromatolites — layered structures built by microbial mats, mostly cyanobacteria — found in the Pilbara region of Western Australia and dated to approximately 3.5 billion years ago. Some researchers have proposed even older microfossils at 3.7 billion years in Greenland, but these remain debated. Stromatolites are not extinct: living examples still form today in Shark Bay, Australia, making them one of Earth's most enduring life forms.
Most biologists say yes. The background extinction rate — the natural baseline between mass extinctions — is roughly 1–5 species per year. Current estimates suggest species are going extinct 100 to 1,000 times faster than that background rate, driven by habitat destruction, climate change, pollution, invasive species, and overexploitation. This is what scientists call the sixth mass extinction, or the Holocene extinction, distinguishing it from the five previous mass die-offs in Earth's fossil record. Unlike those events, this one has a single dominant cause: human activity.
Last updated: March 2026