Permian crinoid columnals from the Zamora Formation near El Volcan, Baja California Norte, Mexico
Gary D. Webster, Marc P. Delattre, 1993. "Permian crinoid columnals from the Zamora Formation near El Volcan, Baja California Norte, Mexico", The Prebatholithic Stratigraphy of Peninsular California, R. Gordon Gastil, R. H. Miller
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Disarticulated Permian crinoid columnals and pluricolumnals, up to 9 cm in diameter, from exotic carbonate blocks in the base of the Zamora Formation, found along Arroyo Zamora near El Volcan, Baja California, Norte, are among the largest ever reported. The relatively inflexible columns that these columnals and pluricolumnals formed are interpreted to have lived in relatively strong currents along the edge of the shelf or upper slope. They are designated Apletoanteris bajaensis n. gen. and n. sp.