English: This image shows a bed of concretions in the Ojo Caliente Member of the Tesuque Formation along the Lemitas Trail, northwest of Espanola, New Mexico, USA. The Ojo Caliente Member is eolian sand deposits with an age of around 10 to 13 million years old.
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Captions
Concretions in an outcrop of the Ojo Caliente Member, Tesuque Formation, on the Lemitas Trail, New Mexico, USA