Services on Demand
Journal
Article
text new page (beta)
English (pdf)
Article in xml format
Article references
Automatic translation
Send this article by e-mailIndicators
-
Cited by SciELO -
Access statistics
Related links
-
Similars in
SciELO
Share
Permalink
Revista mexicana de ciencias geológicas
On-line version ISSN 2007-2902Print version ISSN 1026-8774
Rev. mex. cienc. geol vol.22 n.1 Ciudad de México Apr. 2005
Artículos
Upper Jurassic ammonites and bivalves from the Cucurpe Formation, Sonora (Mexico)
Ammonites y bivalvos del Jurásico Superior de la Formación Cucurpe, Sonora (México)
1Departamento de Paleontología, Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, 04510 México, D. F., Mexico. anab@servidor.unam.mx
2Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, 83000 Hermosillo, Sonora, Mexico.
3Department of Geological Sciences, New Mexico State University, Las Cruces, NM 88003, USA. 4
4Museum für Naturkunde, Zentralinstitut der Humboldt-Universität zu Berlin, Institut für Paläontologie, Invalidenstr. 43, D-10115 Berlin, Germany.
Four new molluscan assemblages from north-central Sonora indicate that the Cucurpe Formation ranges in age from late Oxfordian to early Tithonian. These assemblages extend the known paleogeographic range of Late Jurassic Tethyan fossil groups several hundred km to the northwest and improve correlation of Upper Jurassic strata in northern Mexico. At Rancho La Colgada, near the town of Tuape, the upper part of the Cucurpe Formation consists of 515 m of shale, siltstone, basaltic flows and minor sandstone. The oldest fossil assemblage is assigned to the Bifurcatus Zone of the lower upper Oxfordian and contains the ammonites Perisphinctes (Dichotomoceras?) sp., Sequeirosia? sp., and the bivalves Grammatodon (Grammatodon) hersilius (d´Orbigny), Parainoceramus sp., “ Lucina” potosina Aguilera, “Lucina” sp., and Isocyprina? sp. The second assemblage is assigned to the lower Tithonian (lower part of the Albertinum/Darwini Zone) and consists of the ammonites Mazapilites mexicanus (Aguilera), Schaireria neoburgensis (Oppel), Subplanitoides sp., and Glochiceras (Lingulaticeras?) sp. The third fossil assemblage from the uppermost part of the section includes the ammonites Sublithacoceras cf. sphinctum (Schneid), Sublithacoceras sp., and Pachysphinctes sp., and the bivalves “Lucina” potosina Aguilera and Integricardium (Integricardium) sp. This assemblage belongs to the Semiforme-Verruciferum Zone to Richteri Zone of the middle lower Tithonian. A fourth assemblage is assigned to the lower Tithonian, representing the middle to upper part of the Albertinum-Darwini or the lowermost part of the Semiforme-Verruciferum Zone. This assemblage was collected from the upper part of the Cucurpe Formation at a nearby locality and contains the ammonites Torquatisphinctes subbleicheri (Burckhardt), T. cf. lauri (Aguilera) and Torquatisphinctes sp. cf. T. diversecostatus (Burckhardt). The absence of Kimmeridgian fossils in the measured section at Rancho La Colgada and a conglomerate between the Oxfordian and Tithonian assemblages combine to indicate an unconformity in the Upper Jurassic interval that omits the Kimmeridgian. A single Kimmeridgian ammonite was recently collected in the Cucurpe Formation about 40 km northwest of the study area.
The reported molluscan fossils have close affinities with Tethyan faunas known from other parts of Mexico, Cuba and western Europe. These affinities indicate a possible connection of these regions with Sonora through the young Central Atlantic Ocean and possible faunal dispersal from east to west; however, eastward dispersal across the paleo-Pacific realm is also a possibility. Some endemic species, such as Mazapilites mexicanum and “ Lucina” potosina in Sonora permit correlation with other areas of north-central Mexico and indicate a marine connection throughout the region during the Late Jurassic.
Key words: ammonites; bivalves; Biostratigraphy; Upper Jurassic; Sonora; Mexico
Se estudia la fauna de ammonites y bivalvos del Jurásico Superior de la sección Rancho La Colgada que aflora en la región de Tuape, Sonora, y que corresponde a la parte superior de la Formación Cucurpe. El análisis sistemático de los ammonites y bivalvos permitió el reconocimiento de cuatro asociaciones faunísticas. La más antigua se asignó a la Zona Bifurcatus del Oxfordiano superior y está caracterizada por los ammonites Perisphinctes (Dichotomoceras?) sp., Sequeirosia? sp., y los bivalvos Grammatodon (Grammatodon) hersilius (d´Orbigny), Parainoceramus sp., “Lucina” potosina Aguilera, “Lucina” sp., e Isocyprina? sp. La segunda asociación es de edad Tithoniana temprana (parte inferior de la Zona Albertinum/Darwin) y contiene exclusivamente ammonites: Mazapilites mexicanus (Aguilera), Schaireria neoburgensis (Oppel), Subplanitoides sp., y Glochiceras (Lingulaticeras?) sp. La tercera asociación reconocida en la parte más superior de la sección estudiada incluye los ammonites Sublithacoceras cf. sphinctum (Schneid), Sublithacoceras sp. y Pachysphinctes sp., así como los bivalvos “Lucina” potosina Aguilera e Integricardium (Integricardium) sp. A esta asociación se le asigna una edad correspondiente al intervalo de Zona Semiforme-Verruciferum a Zona Richteri, parte media del Tithoniano temprano. La cuarta asociación reconocida, proveniente de una localidad cercana, está constituida por los ammonites Torquatisphinctes subbleicheri (Burckhardt), T. cf. lauri (Aguilera) y Torquatisphinctes sp. cf. T. diversecostatus (Burckhardt), cuya edad es Tithoniano temprano, parte media a alta de la Zona Albertinum-Darwini o parte más inferior de la Zona Semiforme-Verruciferum.
Los moluscos fósiles encontrados tienen gran afinidad con las faunas del Tethys conocidas en otras partes de México, Cuba y Europa Occidental. Estas afinidades indican una posible conexión de esas regiones con Sonora a través del proto-oceáno Atlántico Central y una posible dispersión del este al oeste, sin descartar otras posibilidades. Algunas especies endémicas, como Mazapilites mexicanum y “ Lucina” potosina de Sonora posibilitan las correlaciones con otras áreas del centro-norte de México, e indican una conexión marina en la región durante el Jurásico tardío.
Palabras clave: ammonites; bivalvos; Bioestratigrafía; Jurásico Superior; Sonora; México
ACKNOWLEDGMENTS
Carlos M. González-León acknowledges support from Consejo Nacional de Ciencia y Tecnología through Project 27824-T. Tim Lawton acknowledges support from NSF Grant EAR-0229565. Antonio Altamira of the Photography Laboratory of the Institute of Geology at the UNAM helped with the illustrations of the specimens. We appreciate the fruitful contributions to the manuscript made by Biol. Ma. E. Gómez and Dr. F. Olóriz.
REFERENCES
Alencáster, G., 1977, Molluscos y braquiópodos del Jurásico Superior de Chiapas: Universidad Nacional Autónoma de México, Revista del Instituto de Geología, 1, 151-166. [ Links ]
Alencáster, G., Buitrón, B.E., 1965, Fauna del Jurásico Superior de la región de Petlalcingo, Estado de Puebla: Universidad Nacional Autónoma de México, Instituto de Geología, Paleontología Mexicana, 21, 1-53. [ Links ]
Arkell, W.J., 1930, The generic position and phylogeny of some Jurassic Arcidae: Geological Magazine, 67(7), 297-310, 67(8), 337- 352. [ Links ]
Arkell, W.J., 1956, Jurassic Geology of the World: Edinbourg, Oliver & Boyd, 806 p. [ Links ]
Arkell, W.J., Kummel, B., Wright, C.W., 1957, Mesozoic ammonoidea, in Arkell, R. (ed.), Treatise on Invertebrate Paleontology, Mollusca L, part 4: University of Kansas Press, L81-L490. [ Links ]
Araujo-Mendieta, J.A., Estavillo-González, C.F., 1987, Evolución tectónica sedimentaria del Jurásico Superior y Cretácico Inferior en el NE de Sonora, México: Revista del Instituto Mexicano del Petróleo, 19, 4-67. [ Links ]
Benzaggagh, M., 1996, Le Malm supérieur et le Berriasien dans le Prerif interne et le Mesorif (Rif, Moroc) ; stratigraphie, sédimentologia, palaeogeographie et evolution tectono-sédimentarie: Rabat, Universidad Mohamed V, tesis doctoral, 403 p. [ Links ]
Bruguière, J.G., 1797, Encyclopédie méthodique. Histoire naturelle des Vers, Partie 21, L´helminthologie, ou les vers intestins, les vers mollusques, etc.: Paris, 160-390. [ Links ]
Buitrón, B.E. , 1984, Late Jurassic bivalves and gastropods from northern Zacatecas, Mexico, and their biogeographic significance, in Westermann, G.E.G. (ed.), Jurassic-Cretaceous biochronology and paleogeography of North America: Geological Association of Canada, Special Paper, 27, 89-98. [ Links ]
Burckhardt, C., 1906: La faune jurassique de Mazapil avec un appendice sur les fossiles du Crétacique inférieur: Boletín del Instituto Geológico de México, 23, 216 p. [ Links ]
Burckhardt, C., 1912, Faunes Jurassiques et Cretaciques de San Pedro del Gallo, Durango: Boletín del Instituto Geológico de México , 29, 264 p. [ Links ]
Burckhardt, C., 1919, Faunas Jurásicas de Symón y faunas Cretácicas de Zumpango del Río: Boletín del Instituto Geológico de México , 33, 135 p. [ Links ]
Burckhardt, C., 1930, Etude synthétique sur le Mésozoïque mexicain: Mémoires Société Paléontologique Suisse, 49-50, 280 p. [ Links ]
Buckman, S.S., 1909-30, Yorkshire Type Ammonites: London, Wesley & Son, text and 790 pl. [ Links ]
Castillo, A., Aguilera, J.G., 1895, Fauna fósil de la Sierra de Catorce, San Luis Potosí: Comisión Geológica de Mexico, Boletín, 1, 1-55. [ Links ]
Cecca, F., Cresta, S., D’Arpa, C., Galácz, A., Goy, A., Henríquez, M.E., Macchioni, F., Martínez, G., Meléndez, G., Olóriz, F., Pavia, G., Sarti, J. Sandoval, J., Ureta, S., 2002, Revision of the Jurassic Ammonites of the Gemmellaro Collections: Quaderni del Museo geológico “G.G. Gemmellaro”, 6, 406 p. [ Links ]
Checa, A. 1985, Los Aspidoceratiformes en Europa (Ammonitina, Fam. Aspidoceratidae: Subfamilys Aspidoceratinae y Physodoceratinae): Universidad de Granada, España, tesis doctoral, 413 p. [ Links ]
Checa, A., Olóriz, F. 1984: Significative Mediterranean “Aspidoceras” in Upper Jurassic biostratigraphy, in Michelsen, O., Zeiss, A. (eds.), International Symposium on Jurassic Stratigraphy III: Copenhagen, Geological Survey of Denmark, 393-414. [ Links ]
Contreras, B., Gómez M.E., Martínez, A., González, V., 1991, Catálogo de las amonitas de México, Parte 1 Jurásico Superior: Instituto Mexicano del Petróleo, 62 p. [ Links ]
Cottreau, J., 1925-1932, Types du Prodrome de Paléontologie stratigraphique universelle d’Alcide d’Orbigny, Tome II. Callovien-Portlandien: Annales de Paléontologie, 14-21, 1-222. [ Links ]
Cox, L.R., 1954, Taxonomic notes on Isognomonidae and Bakeveliidae: Proceedings of the Malacological Society of London, 31, 46- 49. [ Links ]
Cragin, F.W., 1898, Discovery of marine Jurassic rocks in south-western Texas: Journal of Geology, 5, 813-820. [ Links ]
Cragin, F.W., 1905, Paleontology of the Malone Jurassic Formation of Texas: United States Geological Survey Bulletin, series C, 266, 1-172. [ Links ]
Dall, W.H., 1898, Contributions to the Tertiary fauna of Florida with especial reference to the Miocene silex-beds of Tampa and the Pliocene beds of the Caloosahatchie River including in many cases a complete revision of the generic groups treated and their American Tertiary species. Part III: A new classification of the Pelecypoda; Part IV: Pelecypoda: Transactions of the Wagner Free Institute of Science of Philadelphia, 3, 483-947. [ Links ]
De Loriol, P., 1901, Études sur les mollusques et brachiopodes de l’Oxfordien supérieur et moyen du Jura Bernois. Supplement Abhandlungen der Schweizerischen Paläontologischen Gesellschaft, 28, 1-119. [ Links ]
D’Orbigny, A., 1850, Prodrome de paléontologie stratigraphique universelle des animaux mollusques et rayonnés: Paris, Viktor Masson, 1, 428p. [ Links ]
Dietrich, W.O., 1925, Über eine, dem mittleren Saurier-Mergel am Tendaguru äquivelente, rein marine Kimmeridge-Bildung in Mahokondo, Deutsch: Ostafrika: Palaeontographica, supl., 2, 1-13. [ Links ]
Donovan, D.T., Callomon, J.H., Howart, M.K., 1981, Classification of the Jurassic ammonitina, in House, M.R., Senior, J.R. (eds.), The Ammonoidea; The evolution, classification, mode of life and geological usefulness of a major fossil group: London, Academic Press, Systematics Association, Special Volume, 18, 101-155. [ Links ]
Donze, P., Enay, R., 1961, Les céphalopodes du Tithonique inférieur de la Croix-de-Saint -Concors près Chambéry (Savoie): Travaux du Laboratoire de Géologie de la Faculté des Sciences de Lyon, NS7, 7-236. [ Links ]
Douvillé, H., 1890, Sur la classification des Cératites de la Craie: Bulletin de la Société Géologique de France, 18, 275-292 [ Links ]
Duff, K.L., 1978, Bivalvia from the English Lower Oxford Clay (Middle Jurassic): London, Palaeontographica l Society, Monographs, 132, 137 p. [ Links ]
Enay, R. , Geyssant, J.R., 1975, Faunes Tithoniques des châines bétiques (Espagne méridional), en Colloque sur la limite Jurassique-Crétacé, Lyon -Neûchatel, 1973: Mémoires Bureau Recherche Géologique et Minere, 86, 39-55. [ Links ]
Fleming, J., 1828, A history of British animals, exhibiting the descriptive characters and systematical arrangement of the genera and species of quadrupeds, birds, reptiles, fishes, Mollusca and Radiata of the United Kingdom; including the indigenous, extirpated, and extinct kinds; together with periodical and occasional visitants: Edinburgh, 565 p. [ Links ]
Fözy, I., 1995, Upper Jurassic ammonite from Seno di Guidaloca (Western Sicily): Géczy Jubilee Volume, Hantkeniana, 1, 131-143. [ Links ]
Fürsich, F.T., Werner, W., 1988, The Upper Jurassic Bivalvia of Portugal. Part I. Palaeotaxodonta and Pteriomorphia (Arcoida and Mytiloida): Comunicações dos Serviçios Geológicos de Portugal, 73, 103-144. [ Links ]
Fürsich, F.T. , Heinze, M., Jaitly, A.K., 2000, Contributions to the Jurassic of Kachchh, western India. VIII. The bivalve fauna. Part IV. Subclass Heterodonta: Beringeria, 27, 63-146. [ Links ]
Geyssant, J.R. , Enay, R. , 1991, Tithonique, in 3rd International Symposium on Jurassic Stratigraphy Abstracts: Poitiers, 134. [ Links ]
Giebel, C.G., 1852, Allgemeine Paläontologie: Entwurf einer systematischen Darstellung der Fauna und Flora der Vorwelt: Leipzig, 413 p. [ Links ]
González-León, C.M., Lawton, T.F., Iriondo, A., 2001, Upper Jurassic and Lower Cretaceous sedimentary and volcanic strata of the Bisbee basin in northern Sonora: Unión Geofísica Mexicana, GEOS, 21(3), p. 160. [ Links ]
Hernández, R., 1996, Sedimentología y diagénesis del Kimmeridgiano en la región de Jonotla, Puebla y Tlacolula, Veracruz: México, Universidad Nacional Autónoma de México, Facultad de Ingeniería, tesis de maestría, 82 p. [ Links ]
Hyatt, A., 1900, Cephalopoda: in Zittel, K.A. (ed.), Textbook of Paleontology: London, Eastmen, 502-592. [ Links ]
Imlay, R.W., 1940, Upper Jurassic Pelecypods from Mexico: Journal of Paleontology, 14, 393-411. [ Links ]
Imlay, R.W., 1980, Jurassic paleobiogeography of the conterminous United Status in its continental setting: Geological Survey Professional Paper, 1062, 134 p. [ Links ]
International Zoological Code, 2000, Cuarta edición: Comisión Internacional de Nomenclatura Zoológica, 156 p. [ Links ]
Lamarck, J.B. de, 1809, Philosophie zoologique, ou exposition des considérations relatives à l´histoire naturelle des animaux, la diversité de leur organisation et des facultés qu´ils en obtiennent, aux causes physiques qui main tiennent en eux la vie, et donnent lieu aux mouvements quíls exécutent; enfin, à celles qui produisent les unes les sentiments, et les autres l´intelligence de ceux qui en sont douès: Paris, 2 vols., 422 y 473 p. [ Links ]
Lawton, T.F. , González- León, C.M., Villaseñor, A.B. Mauel, D., 2003, Altar-Cucurpe basin, central Sonora: Key to mid -Mesozoic tectonics of northwestern Mexico: Geological Society of America, Abstract with Programs, 35(4), p. 14. [ Links ]
López-Palomino, I., 2002, Análisis bioestratigráfico basado en fauna de ammonites del Oxfordiano (Jurásico Superior) en la región de Tamán, San Luis Potosí: México, D.F., Universidad Nacional Autónoma de México, Instituto de Geología, tesis de maestría, 159 p. [ Links ]
Mauel, D. J., Lawton, T.F. , González-León, C.M. , Iriondo, A. , Villaseñor Amato,J.M., 2003, Late Jurassic stratigraphy, sedimentology, and geochronology of the Altar-Cucurpe basin in the vicinity of Cucurpe, Sonora, northwestern Mexico; Implications for Mesozoic tectonics of the southwestern North American margin: Geological Society of America, Abstracts With Programs, 36(5), 510. [ Links ]
Meléndez, G. , 1989, El Oxfordiense en el sector central de la Cordillera Ibérica (Provincias de Zaragoza y Teruel): Zaragoza, España, Instituto Fernando El Católico, Instituto de Estudios Teruelenses, tesis doctoral, 418 p. [ Links ]
Meek, F.B., Hayden, F.V., 1860, Systematic catalogue of Jurassic, Cretaceous and Tertiary fossils collected in Nebraska: Proceedings of the Academy of Natural Sciences of Philadelphia, p. 419. [ Links ]
Myczynski, R., 1989, Ammonite biostratigraphy of the Tithonian of western Cuba: Annales Societatis Geologorum Poloniae, 59, 43-125. [ Links ]
Myczynski, R., 1994, Caribbean ammonite assemblages from Upper Jurassic - Lower Cretaceous sequences of Cuba: Studia Geologica Polonica, 105, 91-108. [ Links ]
Myczynski, R. 1994, Tithonian stratigraphy and microfacies in the Sierra del Rosario, Western Cuba: Studia Geologica Polonica , 105, 7-38. [ Links ]
Myczynski, R., Olóriz, F. , Villaseñor A.B., 1998, Revised biostratigraphy and correlations of the Middle-Upper Oxfordian in the Americas (Southern USA, Mexico, Cuba, and Chile): Neues Jahrbuch für Geologie und Palaeontologie Abhandlungen, 207, 185-206. [ Links ]
Newton, R.B., 1891, Systematic list of the F.E. Edwards Collection of British Oligocene and Eocene Mollusca in the British Museum (Natural History), with references from similar horizons contained in the collections belonging to the Geological Department of the Museum: London, 365 p. [ Links ]
North American Commission on Stratigraphic Nomenclature (NACSN), 1983, North American Stratigraphic Code: American Association of Petroleum Geologists, Bulletin, 67(5), 841-875. [ Links ]
Olóriz, F. , 1978, Kimmeridgiense- Tithonico Inferior en el sector central de las Cordilleras Béticas (Zona Subbética) Paleontología, Bioestraigrafía: Granada, España, Universidad de Granada, tesis doctoral, 758 p. [ Links ]
Olóriz, F. , Villaseñor, A.B. , González-Arreola, C., Westermann, G.E.G., 1999, Ammonite biostratigraphy and correlations in the Upper Jurassic-Lowermost Cretaceous La Caja Formation of north-central Mexico (Sierra de Catorce, San Luis Potosí), in Olóriz, F. , Rodríguez-Tovar, F.J. (eds.), Advancing Research on living and fossils cephalopods: New York, Kluwer Academic/Plenum Publishers, 463-492. [ Links ]
Olóriz, F. , Villaseñor, A.B., in press, Oxfordian ammonites from the lower part of the Santiago Formation at the type-section Moctezuma river, Tamán, San Luis Potosí (Mexico): Journal of Paleontology . [ Links ]
Parent, H., 2003, The ataxioceratid ammonite fauna of the Tithonian (Upper Jurassic) of the Casa Pincheira, Mendoza (Argentina): Journal of South America Earth Sciences, 16, 143-165. [ Links ]
Rangin, C., 1977, Sobre la presencia del Jurásico Superior con amonitas en Sonora Septentrional: Universidad Nacional Autónoma de México, Revista del Instituto de Geología , 1, 1-4. [ Links ]
Roeder, H.A., 1882, Beiträge zur Kenntniss des Terrain à Chailles und seiner Zweischaler in der Umgegend von Pfirt im Ober-Elsass: Straßburg, 110 p. [ Links ]
Rodríguez-Castañeda, J.L., 1984, Geology of the Tuape region, north-central Sonora, Mexico: University of Pittsburg, Master thesis, 157 p. [ Links ]
Rodríguez-Castañeda, J.L., 1988, Estratigrafía de la región de Tuape, Sonora: Universidad Nacional Autónoma de México, Revista del Instituto de Geología , 7, 52-66. [ Links ]
Rodríguez-Castañeda, J.L., 1990, Relaciones estructurales en la parte centro-septentrional del Estado de Sonora: Universidad Nacional Autónoma de México, Revista del Instituto de Geología , 9, 51-61. [ Links ]
Rodríguez-Castañeda, J.L., 1991, Mesozoic stratigraphy in north-central Sonora, Mexico: Universidad de Sonora, Boletín del Departamento de Geología, 8, 13-27. [ Links ]
Rollier, L., 1912, Fossiles nouveaux or peu connus des terrains secondaires (Mésozoiques) du Jura et de contrées environnantes: Mémoires de la Société Paléontologique de Suisse, 38, 33-148. [ Links ]
Spath, L.F., 1924, On the Blake collection of ammonites from Kachh, India: Palaeontologia Indica, New Series 9, Memoir 1, 1-29. [ Links ]
Spath, L.F., 1925, Ammonites and Aptychi: Glasgow, Scotland, Glasgow University, Monographs of the Geological Department of the Hunterian Museum, 1(7), 111-164. [ Links ]
Spath, L.F., 1927-33, Revision of the Jurassic cephalopod faunas of Kachh (Cutch): Memoirs of the Geological Survey of India, Palaeontologia Indica , New Series 9, Memoirs 2 (1-6), 945 p. [ Links ]
Schneid, T., 1915, Die Ammoniten fauna der Obertithonischen kalke von Neübutg A. D.: Jena, Geologische und Palaeontologische Abhandlungen, 13, 305-400. [ Links ]
Steinmann, G., Doderlein, L., 1890, Elemente der Paläontologie: Leipzig, W. Engelmann, 848 p. [ Links ]
Tavera, J.M., 1985, Los amonites del Tithoniano Superior Berriasense de la zona Subbética (Cordilleras Béticas): Universidad de Granada, España, tesis doctoral, 381 p. [ Links ]
Verma, H., Westermann, G.E.G. 1973, The Tithonian (Jurassic) ammonite fauna and stratigraphy of Sierra Catorce, San Luis Potosí, Mexico: Bulletins of American Paleontology, 63(277), 107-320. [ Links ]
Vetter, R.D., Powell, M.A., Somero, G.N., 1991, Metazoan adaptations to hydrogen sulphide, in Bryant, C. (ed.), Metazoan Life without Oxygen: London, Chapman and Hall, 109-128. [ Links ]
Villaseñor, A.B. , 1991, Aportaciones a la bioestratigrafía, basada en fauna de ammonites, de la sucesión del Jurásico Superior (Kimmeridgiano-Tithoniano) del área de Mazapil, Zacatecas, México: México, D.F., Universidad Nacional Autómoma de México, Facultad de Ciencias, tesis doctoral, 156 p. [ Links ]
Villaseñor, A.B. , Olóriz, F. , González-Arreola, C. , Lara, L., de la Mora, A., 1994. Homotaxy and the Kimmerdgian-Tithonian boundary in North-Central Mexico, in 4th International Congress on Jurassic Stratigraphy and Geology, Abstracts, Mendoza, Argentina, p. 46. [ Links ]
Villaseñor, A.B. , Olóriz, F. , González-Arreola, C. , 2000, Recent advances in Upper Jurassic (Kimmeridgian-Tithonian) ammonite biostratigraphy of north-central Mexico based on recently collected ammonite assemblages: Geo Research Forum, 6, 249-262. [ Links ]
Waagen, W., 1869, Die Formenreihe des Ammonites subradiatus: Geologische Paleontologische Beiträge, 2, 181-256. [ Links ]
Ziegler, B., 1958, Monographie der Ammonitengattung Glochiceras im Epikontinental Weissjura Mitteleuropas: Palaeontographica A, 110, 93-164. [ Links ]
Zeiss, A. , 1968, Untersuchungen zur Paläontologie der Cephalopoden des Unter-Tithon der Südlichen Frankenalb: Bayerische Akademie der Wissenschaften Abhandlungen Neue Folge, Heft, 132, 7-190. [ Links ]
Zittel, K.A. von, 1884, Handbuch der Palaeontologie: Munich and Leipzig, R. Oldenburg, 893 p. [ Links ]
Zittel, K.A. von, 1895, Grundzüge der Palaeontologie: Munich and Leipzig, R. Oldenburg , 971 p. [ Links ]
Received: December 08, 2003; Revised: November 08, 2004; Accepted: November 24, 2004
This is an open-access article distributed under the terms of the Creative Commons Attribution License
