With their complex structures, dragonflies have constituted a model for new types of Sikorsky helicopters. Research showed that this insect possesses an ideal flying system. This dragonfly, which lived 150 million years ago, is identical to the perfectly formed dragonflies alive today. There are no traces of a "half dragonfly" or a dragonfly whose wings are just becoming established among all the fossils unearthed so far. Like other species of animals and plants alike, these creatures emerged suddenly and have remained unchanged down to the present day.
This is a fossil that has left positive and negative impressions on the two layers of stone.