In 1902-03 he conducted geological studies of northern Madagascar that included Diego Suarez. In 1904 he performed geological/exploratory investigations in Morocco. From 1908 to 1919 he was head of the Géologie au Laboratoire Colonial in Paris. During this time period he also taught classes in geology at the Ecole spéciale d'Architecture. Following the retirement of Stanislas-Étienne Meunier, he was appointed chair of geology at the Muséum national d'histoire naturelle. From 1932 to 1936 he was director of the museum. In 1916 in collaboration with other scientists, he created the Société de Documentation Paléontologique, which later became known as the Syndicat de Documentation Géologique et Paléontologique. Lemoine was a member of the Académie des sciences, the Société de biogéographie, the Société française de minéralogie et de cristallographie and the Société géologique de France.
Evolution
Lemoine has been cited in creationist literature as being anti-evolution. A quote often attributed to him from the Encyclopédie française is:
"It results from this explanation that the theory of evolution is not exact... Evolution is a kind of dogma which its own priests no longer believe, but which they uphold for the people. It is necessary to have the courage to state this if only so that men of a future generation may orient their research into a different direction."
Études géologiques dans le nord de Madagascar: Contributions à l'histoire géologique de l'océan indien, 1906.
Contributions à la géologie des colonies françaises, 1908–09.
Géologie du bassin de Paris, 1911
Excursion de la Société géologique de France à Vigny et à Meulan, le 17 mars 1912, sous la conduite de MM. G.-F. Dollfus et Paul Lemoine. Étude de la position stratigraphique du calcaire pisolithique, 1912.
Afrique occidentale, 1913.
Volcans et tremblements de terre, 1928.
Mon oeuvre au Muséum national d'histoire naturelle pendant cinq ans de direction. 1932-1936, 1936.
Bibliographie des sciences géologiques, ; published by the Geological Society of France with assistance from the French Society of Mineralogy... Second set. Volume VIII. Foreword by Paul Lemoine and R. Laffitte. [- Volume IX. Foreword by R. Laffitte.
Note:: He is not to be confused with Paul Lemoine, French pediatrician.