A Century of Mexican Paleontology: The Coahuila Hadrosaur and the Monoclonius Misidentification

A century after the discovery that founded Mexican paleontology: the history of the Coahuila Hadrosaur erroneously identified in 1926 as Monoclonius.

In 1910, German geologist Erich Haarmann discovered skeletal remains near the Hacienda de Movano, Coahuila. These fossils were sent to Berlin and subsequently described in 1926 by Werner Janensch in his work “Dinosaurier-Reste aus Mexiko”.

Although Janensch initially attributed the specimens to the horned dinosaur Monoclonius based on a bone fragment, modern investigations have revealed that the remains actually belonged to a Hadrosaur (“duck-billed” dinosaur).

This technical milestone now marks its centennial, consolidating the importance of Coahuila as a paleontological epicenter.

Bibliographic Reference:
Janensch, W. (1926). Dinosaurier-Reste aus Mexiko. Centralblatt für Mineralogie, Geologie und Paläontologie: 192-197.

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Original drawing by Werner Janensch (1926) showing the vertebrae and pelvic fragment collected in Coahuila.