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San Julian Anticlinorium in northern Zacatecas State, central Mexico. Vertical ridge-forming limestones of Oxfordian Zuloaga Formation are well-exposed along the area. Thin section of redbeds – possibly La Joya Formation (Middle Jurassic?) – underlie Zuloaga (left side of picture next to cliff), and the rest of the outcrops in the left (including the slope) are terrestrial volcanic-sedimentary sequences of the latest Triassic-Early Jurassic Nazas Formation. The Nazas sequences record two deformational events: a) in mid-Jurassic time, and b) latest Cretaceous-early Tertiary time (Laramide Orogeny). Photo by Claudio Bartolini.
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San Julian Anticlinorium in northern Zacatecas State, central Mexico. Vertical ridge-forming limestones of Oxfordian Zuloaga Formation are well-exposed along the area. Thin section of redbeds – possibly La Joya Formation (Middle Jurassic?) – underlie Zuloaga (left side of picture next to cliff), and the rest of the outcrops in the left (including the slope) are terrestrial volcanic-sedimentary sequences of the latest Triassic-Early Jurassic Nazas Formation. The Nazas sequences record two deformational events: a) in mid-Jurassic time, and b) latest Cretaceous-early Tertiary time (Laramide Orogeny). Photo by Claudio Bartolini.