Johann Heinrich Conrad Gottfried Gustav Steinmann (9 April 1856 – 7 October 1929) was a German people geologist and paleontology. He performed various studies in the Ural Mountains, North America, South America, the Caucasus and the Alps. Steinmann had a large number of scientific publications. He made contributions to the Theory of Evolution and to the study of the structural geology and orogeny of the Andes.
In the Alps and Apennines Steinmann defined what later became known as the "Steinmann Trinity," the occurrence of serpentine group, pillow lava, and chert. The recognition of Steinmann's Trinity served years later to build up the theory around seafloor spreading and plate tectonics. Steinmann himself interpreted (the Trinity) using the geosyncline concept.
In Peru Steinmann studied the geology of Cerro de Pasco and of the Marañón fold and thrust belt among other things. In a work published posthumously by his students in 1929 Steinmann defined the main phases of the Andean orogeny in Peru. He theorized that the apparent lack of in the Peruvian Andes within geosyncline; it was either indebted to the Andes being preceded by a shallow geosyncline or the Andes representing just the margin of a geosyncline.
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