The 150-Year Mystery of Pliohippus: Why Paleontologists Still Can't Explain This Fossil Horse's Face
This article explores the enduring paleontological mystery of Pliohippus, an extinct fossil horse that has been displayed at the Field Museum for over 80 years. The central puzzle is the horse's unusual preorbital fossa — a pronounced cavity in front of the eye socket whose function has baffled scientists since the species was named in 1874. The article discusses various hypotheses (such as a scent gland, jaw muscle attachment, or resonating chamber) and highlights how even modern technology like CT scanning has failed to solve the mystery, making it a humbling reminder of the limits of paleontological knowledge.
Key quotes
I don't know what's going on with this horse's face.
The preorbital fossa of Pliohippus has been a paleontological head-scratcher since the horse was named in 1874.
Bizarre structures often seem to call for exceptional explanations.
Even with all our modern technology, we still can't figure out what this weird hole in a fossil horse's face was for.
From the article
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