Selachian fauna from the Upper Cretaceous Dalton Sandstone, middle Rio Puerco Valley, New Mexico
Sally C. Johnson and Spencer G. Lucas

Abstract:

Three localities in the Coniacian Dalton Sandstone along the Rio Puerco in Bernalillo County, New Mexico, yield numerous
teeth of selachians in addition to other vertebrate fossils. The selachian fauna is composed of Scapanorhynchus raphiodon, Squalicorax kaupi, Pseudohypolophus mcnultyi, Ptychotrygon triangularis, Ischyriza mira, Cantioscyllium decipiens, Squatina sp., Hybodus cf. H. butleri and Ptychodus mortoni. Pseudohypolophus and Scapanorhynchus are the dominant selachian taxa from these localities. Taxonomic composition does not vary between the Dalton selachian localities, but the percentages of taxa present do vary. These differences are most likely due to hydraulic sorting by currents and by storm action.


Citation:

  1. Johnson, Sally C.; Lucas, Spencer G., 2003, Selachian fauna from the Upper Cretaceous Dalton Sandstone, middle Rio Puerco Valley, New Mexico, in: Geology of the Zuni Plateau, Lucas, Spencer G.; Semken, Steven C.; Berglof, William R.; Ulmer-Scholle, Dana S., New Mexico Geological Society, Guidebook, 54th Field Conference, pp. 353-358.

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