Meganeura - The Giant Dragonfly. When: Carboniferous million years ago). Meganeura is the largest dragonfly, with a wingspan of feet cm) in some specimens. The largest living dragonfly is a comparatively tiny inches cm) across at the wings.
Incredible specimen of large crystals of grey Calcite atop sparkling Marcasite covered matrix. From the Brushy Creek Mine, Drift Greeley, Viburnum Trend District, Reynolds Co. Measures cm by cm by 8 cm in total size.