picpac2026 on Instagram: "This viral video of splitting a limestone slab to reveal a Knightia fish fossil from Wyoming’s Green River Formation, dated to about 50 million years ago during the Eocene epoch. - The narration accurately depicts permineralization, where sediments buried the fish in an anoxic prehistoric lake, allowing minerals to replace tissues while preserving fine details like scales and fins. - These fossils, studied in works like Lance Grande’s 1980 research, offer rare snapshots