21. Paleogene and Neogene fossils of fairyflies were first described in 1901 by Fernand Anatole Meunier. 22. However, a 1997 analysis ascribed the rocks only to the Paleogene / Neogene periods. 23. It contains Neogene to Quaternary aged material. 24. This contributed to lithospheric thinning and decompression melting of mantle to produce alkaline Neogene magmatism. 25. This type of forest extended during the Neogene , more than 20 million years ago. 26. The Neogene experienced periods of volcanic activity. 27. Some of these, especially for the Neogene , were already established in the 19th century. 28. Metamorphic rock and Cretaceous Neogene Period. 29. The gap continues into the Cenozoic for the entire length of the Paleogene and Neogene periods. 30. The Claremont Shale formation preserves fossils dating back to the Miocene epoch of the Neogene period.