Sightseeing, commercial, artistic, administrative, and educational activities took place, as if the hypothesis was an established scientific theory. The environmental education was a notable regional highlight. The city of Nova Iguaçu adopted traffic signs with volcanic images. A movement began to register the Municipal Park to the UNESCO as “Geopark of the Nova Iguaçu Volcano”. Some scientific events and the homepage of the DRM-RJ referred to the Municipal Park as the Geopark. Certain newspapers printed, based on the interviews of another geologist, that the UERJ and Petrobrás (Brazilian National Petroleum Company) were investing one million dollars over two years in researching the oilfield by means of the Nova Iguaçu Volcano. Scientific doubts The first scientific article concerning Nova Iguaçu geology was published in 2006. In the article, and at several scientific events, Akihisa Motoki presented a case against the existence of a volcano at Nova Iguaçu, showing that the geology and morphology of Nova Iguaçu are incompatible with the volcanic model. No article defending the volcano hypothesis has been published in a qualified scientific journal. Geological discussion Volcanic crater A volcanic crater is a circular negative morphology formed after an explosive eruption. The eruption forms breccia with large clasts, called explosion breccia. The DRM-RJ states the crater is present in a horseshoe-shaped valley situated about 2 kilometers to the south of the urban zone. Vieira & Klein presented the north-south geologic cross-section of the supposed crater, showing a prominent volcanic cone. However, the topographic map of this area does not exhibit morphologic characteristics. The inner walls of the valley are not sub-vertical, but have a shallow angle of 15 to 20°, comparable to a slope formed by erosion. Klein & Vieira inferred that the supposed crater area might be underlain by volcanic agglomerate, that is, volcanic breccia with large clasts. The rock is trachyte and thus disproves the volcanic crater theory. Volcanic cone The volcanic cone corresponds to the cone-formed positive morphology originated from the accumulation of solid eruptive materials. Vieira & Klein presented an illustration of the Nova Iguaçu volcanic cone, of 1.7 kilometers in diameter, 250 meters in relative height, and 27° in flank angle. If so, the cone must appear prominently on the north-eastern flank of the Mendanha massif, and be easily recognized from Nova Iguaçu and neighbouring cities; however, such a cone is not seen or confirmed by topographic map and satellite images. Volcanic bomb A