Ulrichospira Donald (Gastropoda – Phanerotrematidae) from the Middle Ordovician of central Sonora, Mexico: Paleobiogeographical considerations
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Abstract
The Ordovician gastropod Ulrichospira Donald is described from a stratigraphic sequence exposed in the area of Rancho Las Norias in central Sonora, Mexico. This is the first record of the genus from Mexico, and it was associated with abundant fauna com-posed of bryozoans, brachiopods, gastropods, and trilobites. This gastropods Ordovician association from Las Norias formation displays a clear affinity with the North American craton, including the United States and Canada
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References
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