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Cover: Oblique aerial view showing the collar of the central uplift of Serra da Cangalha impact structure (Brazil). The structure has a diameterof 13 km. The collar comprises sandstones of Mississipian age, has a diameter of 4 km, and its ridges rise up to 350 m from the surroundingterrain. Vasconcelos et al. discuss the structure in their article on p. 1659. (Image courtesy of Andrea Bartorelli).