His principal work, Letkaea Geognostica (2 vols., Stuttgart, 1834–1838; 3rd ed. with F. Romer, 3 vols., 1851–1856), has been regarded as one of the foundations of German stratigraphical geology.
A súa obra principal, Letkaea Geognostica (2 vol., Stuttgart, 1834-1838; 3ª ed. con F. Romer, 3 vol., 1851-1856), considérase unha das fundadoras da estratigrafía alemá.