Au Hoggar

The author recounts a scientific mission across the central Sahara presenting detailed geological studies and a regional synthesis of Cretaceous-to-Tertiary formations, supported by maps and plates. Observations consider past lagoonal or marine phases, sedimentary and erosional processes, ephemeral river dynamics, chotts, and artesian influences, and propose paleogeographic and hydrologic interpretations. Travel impressions and route descriptions are interwoven to enliven technical sections, while matters of personal hardship and political activity are largely omitted; the work also situates its results relative to earlier explorations and discusses points of confirmation and novelty.