BRASILIA, June 19 (Reuters) - The head of Brazilian

environmental agency Ibama, Rodrigo Agostinho, said on Wednesday

that he expects a decision soon on state-owned oil company

Petrobras' request to conduct exploratory studies on

the Amazon River's mouth.

Petrobras has been pushing for a license to drill in the

northernmost area of a region known as Equatorial Margin, near

the mouth of the Amazon River, where scientists have warned of

threats to local coral and coastal biomes.