Piolenc site. A: amber grains in a sandstone level; B: nodule and grain of amber (arrows) in sandy marls; C: opaque orange amber nodule in more or less flaky sandy marl. D: grains of amber in a gangue made up of woody fragments; E: Appearance of translucent amber grains; F: completely opaque earthy-looking amber grains; G: thin sections of amber nodules showing the gangue rich in vegetable organic matter; H: thin sections of translucent amber grains in the form of drops with their characteristic red envelope; I: thin sections of opaque amber grains showing the invasion of the grain by impurities; J: views of amber grains in SEM with a translucent appearance (two copies on the left) with possibly a visible crust (arrow) or opaque (two copies on the right). (MNHN collection).