The spoil tips (“terrils”) of coal mines are very visible components of the landscape of the ‘Hauts-de-France’ region in France. Some are protected for the particular flora and fauna that colonize them. They are also very important for their palaeontological contents. In UK, some spoil tips have been extensively investigated thanks to active collaborations between searchers and amateur associations (e.g. Writhlington, Jarzembowski, 2004). Similar operations never happened in France. Nevertheless, thanks to the active researches of two of us (JO and PR), we could recover and study a fossil entomofauna of crucial interest. Insects (mainly isolated wings) were recovered in pieces of rocks from a layer with an impressive concentration of plant fragments (leaves, stems, etc.). If some are very large, the great majority is less than 10 mm long. Between 2010 and 2019, we found representatives of Palaeodictyoptera, Odonatoptera, Archaeorthoptera (incl. oldest Titanoptera), Paoliida, Dictyoptera, stem group of Plecoptera, ‘Grylloblattodea’, Acercaria, and Holometabola (Nel et al., 2013) on a terril (spoil tip) in Avion locality, with coal mine debris attributed to Moscovian age. Fossils of these two last clades are very small wings, 2-5 mm long and the oldest representatives of the Psocodea, Thripida, Hemiptera, stem group Hymenoptera, Mecopterida, and possibly Neuropterida. These subclades are all represented by one fossil, except for the Hemiptera known by two Euhemiptera and the oldest fossil Sternorrhyncha, newly discovered. Thus they are much less frequent than the other palaeopteran and polyneopteran clades. These fossils are crucial for dating the major insect clades. They also demonstrate that the Holometabola appeared and began to diversify into their modern subclades well before their major Triassic radiation.