RIO DE JANEIRO, BRAZIL - In the 1980s the theory first emerged that there was an extinct volcano just outside Rio de Janeiro. This was based on the discovery of pyroclastic rocks in the Parque Natural Municipal de Nova Iguaçu in the lowlands outside Rio de Janeiro, known as the Baixada Fluminense.

The Serra do Vulcão hike, and the volcano itself, are extremely well-known in this suburb of Rio - the city of Nova Iguacu has even adopted traffic signs with volcano-like images - but many Cariocas and gringos have never even heard of the place.

Fortunately, the volcano . . .

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