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pretation. Furthermore, clay-sized quartz grains of likely aeolian origin may come from adjacent desert plains (Ifrim, 2006). These data suggest that high insolation of the surface waters heated the upper water layers. The widespread regional distribution of the Vallecillo Platy limestone indicates that the sediment was deposited on the open shelf. This is supported by the pelagic assemblage and absence of submarine barriers in the region around Vallecillo. This is unusual, because all other platy limestone deposits known from the Jurassic, Cretaceous and early Tertiary formed in restricted basins, such as lagoons or lakes. These platy limestone deposits are famous for the excellent preservation of fossils, but most are restricted in their horizontal extent, in some cases to just 100 m 2 . The open marine shelf origin of the Vallecillo Platy limestone deposit appears to be related to the late Cenomanian Oceanic Anoxic Event 2 (OAE 2). On the NE Mexican shelf, stagnant water conditions apparently persisted into the Early Turonian, allowing for widespread formation of platy limestone (Ifrim, 2006). The Vallecillo Platy Limestone Member provides therefore the first evidence for an open marine formation of platy limestone (Ifrim et al., 2005b). Collections Over the years, two types of collections were initiated: (a) a random collection, which includes specimens unearthed by the quarrymen, as well as other randomly collected specimens from the quarries, mostly without stratigraphic data, and (b) scientific excavations in defined areas, with all lithological and paleontological data recorded and fotodocumented. Figure 19. Left: distribution of vertebrate fossils over the Vallecillo section. Right: Comparison of abundances of vertebrate taxa in the random collection (upper) and scientific excavation (lower) shows great differences regarding their shares, comparable to the overall distribution shown in Figure 5. It is thus clear that articulated specimens of Tselfatia are greatly preferred towards e.g. Rhynchodercetis, a smaller species, which mainly occurs in primary fragments. 131
Many fossils were collected during these excavation campaigns. The composition of the fossil assemblage at Vallecillo is known from a series of excavations carried out between 2003 and 2006. During excavation, 2100 specimens have been registered and photo-documented, hence not all collected. Both types of collections differ considerably from the results, as shown by Ifrim et al. (this volume-b) and in Figures 5 and 19: the random collection, the material of which is mainly housed in the UANL-FCT, Linares, yields many well-preserved specimens and includes rare taxa that yield an insight into the diversity of the Vallecillo biota. Collections based on the excavations, provided few well-preserved specimens, but first confident data on the absolute composition of the Vallecillo assemblage (Ifrim, 2006; Ifrim et al., 2007, 2008b; this volume-a). The number of 510 determined fish specimens reaches statistical significance and allows quantitative analysis of taxon abundances. In general the fish assemblage is characterized by a low taxonomic diversity. Recent studies on the fish fossils include taphonomic interpretations. The abundance of fossils allows the taphonomic interpretation of the three most abundant Vallecillo fishes: Rhynchodercetis, Tselfatia, and Nursallia, all three of which differing in their locomotion type, feeding habits and preferred water depths. They comprise 85% of the excavated, determined fish assemblage (Figure 19), but existed in the Turonian sea without interfering with each other (Ifrim et al., 2005a; Ifrim, 2006). References Blanco, A. & Alvarado-Ortega, J. 2006. Rhynchodercetis regio, sp. nov., a dercetid fish (Teleostei: Aulopiformes) from Vallecillo, Nuevo León State, northeastern Mexico: Journal of Vertebrate Paleontology, 26 (3), 552-558. Blanco, A. & Cavin, L. 2003. New teleostei from the Agua Nueva Formation (Turonian), Vallecillo (NE Mexico): Comptes Rendus Paleovol, 2: 299-306. Blanco, A., Stinnesbeck, W., López-Oliva, J.-G., Frey, E., Adatte, T. & González, A. H. 2001. Vallecillo, Nuevo León: una nueva localidad fosilífera del Cretácico Tardío en el noreste de México: Revista Mexicana de Ciencias Geológicas, 18 (2): 196-199. Blanco-Piñon, A. 2003. Peces fósiles de la Formación Agua Nueva (Turoniano) en el Municipio de Vallecillo, Nuevo León, NE-México [PhD thesis]: Universidad Autónoma de Nuevo León, 345 p. Blanco-Piñon, A. & Alvarado-Ortega, J. 2005. New dercetid fish (Aulopiformes: Teleostei) from the early Turonian of Vallecillo, NE Mexico, 4th International Meeting on Mesozoic Fishes, Madrid, Abstract book: 43-46. Blanco-Piñon, A., Frey, E., Stinnesbeck, W. & López-Oliva, J. G. 2002. Late Cretaceous (Turonian) fish assemblage from Vallecillo, northeastern Mexico: Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 225 (1): 39-54. Blanco-Piñon, A., Garibay-Romero, L. M. & Alvarado-Ortega, J. 2007. The oldest stratigraphic record of the Late Cretaceous shark Ptychodus mortoni Agassiz, from Vallecillo, Nuevo León, northeastern Mexico: Revista Mexicana de Ciencias Geológicas, 24 (1): 25-30. Blanco-Piñon, A., Shimada, K. & González-Barba, G. 2005. Lamnoid vertebrae from the 132
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UNIVERSIDAD AUTÓNOMA DEL ESTADO DE
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UNIVERSIDAD AUTÓNOMA DEL ESTADO DE
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THE FIFTH INTERNATIONAL MEETING ON
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— The ichthyofauna from the Upper
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16:15 - 16:30 Coffee break teogloss
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10:30 - 11:00 G. Arratia & H.-P. Sc
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ON THE OCURRENCE OF ARARIPICHTHYS I
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A NEW GONORYNCHIFORM FISH FROM THE
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ABOUT SOME REMARKABLE MORPHOLOGICAL
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THE MESOZOIC RECORD OF CHONDRICHTHY
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MESOZOIC FISHES FROM AUSTRALIA Rodn
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LAMPRIDIFORMES OF THE CRETACEOUS AN
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NONMARINE ACTINOPTERYGIAN FISH AS
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A NEW NOTOPTERID (TELEOSTEI, OSTEOG
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THE LATE HAUTERIVIAN (EARLY CRETACE
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A SPECIES OF THE AUSTRALIAN LUNGFIS
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A NEW SPECIES OF HETEROPTYCHODUS (E
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FOSSILS OF THE FAMILY KNERIIDAE (TE
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PREPARATION OF FOSSIL FISHES FROM V
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MAASTRICHTIAN SHARKS OF THE ESCONDI
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LATE CRETACEOUS SHARKS FROM THE PEN
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A FOSSIL AGONID (ACTINOPTERYGII, TE
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PHYLOGENETIC RELATIONSHIPS OF BASAL
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SCIENTIFIC EXCAVATION VERSUS RANDOM
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RESEARCH INTO THE TURONIAN (LATE CR
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LUNGFISH AS ENVIRONMENTAL INDICATOR
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THE FIRST ?ICHTHYODECTIFORM FROM SC
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AN ERA OF SUSPENSE: THE ECOLOGICAL
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A NEW PYCNODONTID SPECIES FROM THE
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ANATOMICAL REVIEW OF †SALMINOPS I
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REVISITING THE MORPHOLOGY OF THE AC
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NEW PARACLUPEID FISHES (TELEOSTEI:
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SERROLEPIS, A LITTLE KNOWN POLZBERG
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CLUPEOMORPHS FROM THE EL DOCTOR FOR
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INTERNAL SOFT ANATOMY AND ORGANIC F
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