Early Cambrian sponge spicules from the Cerro Clemente and Cerro Rajón, Sonora, México
Keywords:Sponges, Spicules, Early Cambrian, Kiwetinokia, Puerto Blanco Formation
AbstractAcid 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.
How to Cite
The commercial rights of the printed and online versions of Geologica Acta are property of the UB, ICTJA, IDAEA and UAB, and Geologica Acta must be cited for any partial or full reproduction.
The opinions and conclusions stated in each article are the exclusive responsability of the authors and do not necessarily coincide with those of the above mentioned institutions UB, ICTJA, IDAEA and UAB.
Authors retain the copyright on their papers (accepted manuscript, uncorrected proof and published paper) and are authorized to post them on their own Web page or their institutional repositories. In all cases, the complete citation and a link to the Digital Object Identifier (DOI) of the article must be included.
The authors can use excerpts or reproduce illustrations of their papers in other works without prior permission of Geologica Acta provided the source of the paper including the complete citation is fully acknowledged.
Papers are distributed under the Attribution-Share Alike Creative Commons License. This license allows others to alter, remix or build upon a paper and the resulting work may be distributed under the same or similar license to this one.