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| Format: | Artículo científico |
| Langue: | en |
| Publié: |
Universitat de Barcelona
2008
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| Accès en ligne: | https://www.redalyc.org/articulo.oa?id=50513116006 |
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- Early Cambrian sponge spicules from the Cerro Clemente and Cerro Rajón, Sonora, México MARK A.S. McMENAMIN Ciencias de la Tierra Sponges Spicules Kiwetinokia Early Cambrian Puerto Blanco Formation Acid maceration and thin section analysis of archaeocyathan limestones of the Cerro Clemente and Cerro Rajón, Sonora, México, have yielded some of the most ancient sponge fossils reported from the North American Cordillera. The sponge fossils are from Unit 3 of the Puerto Blanco Formation. The fossils include one of the earliest known specimens of Kiwetinokia WALCOTT. These new data indicate that diverse archaeocyaths and sponges occur in close association within Lower Cambrian limestones of Sonora. The new specimen of Kiwetinokia sp. provides evidence that geometrically complex spicules in Cambrian sponges evolved by the fusion of simpler spicule types. These are among the earliest sponges known to have lived in reef habitats. 2008 artículo científico 1695-6133 https://www.redalyc.org/articulo.oa?id=50513116006 en http://www.redalyc.org/revista.oa?id=505 Geologica Acta: an international earth science journal application/pdf Universitat de Barcelona Geologica Acta: an international earth science journal (España) Num.4 Vol.6