Estrada-Ruiz, Emilio , Martínez-Cabrera, Hugo I .
A new angiosperm fossil wood from the Upper Cretaceous (Conician-Turonian) of Chihuahua, Mexico.
The North of Mexico has several formations from the Upper Cretaceous with abundant angiosperm woods. Here we describe a new wood from San Carlos Formation (Conacian-Turonian) in Chihuahua, northern Mexico. This new genus has diffuse porous, solitary and multiple radial of 2 (3 ) vessels, simple perforation plates, small alternate intervessel pits, vessel-ray parenchyma pits small rounded with reduced borders, fibers septate and non septate, heterocellular and storied rays. These characters resemble Paraphyllanthoxylon, a common species in Cretaceous sediments. However, the presence of storied structure does not support its inclusion in this genus. The characters present in the San Carlos formation wood are present in Malvaceae s.l. and Lauraceae, but the combination of diffuse porous, simple perforation plate, heterocellular and storied rays, brings it closer to Malvaceae s.l. This family is well represented in other formations in the northern Mexico as Olmos Formation (Upper Cretaceous) and southern United States (e.g., Aguja and Javelina Formations). This fossil wood is the earliest occurrence of storied structure in the fossil record and the earliest angiosperm record for the State Chihuahua and also represents the first.
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1 - Universidad Autónoma de Guerrero, Unidad Académica en Ciencias de la Tierra, Taxco, Taxco, Guerrero, MEX
2 - University of Connecticut, Department of Ecology and Evolutionary Biology, 75 North Eagleville Road, Unit 3043 , Storrs, CT, 06269-3043, USA
Presentation Type: Poster:Posters for Sections
Location: Hall A/Convention Center
Date: Monday, August 2nd, 2010
Time: 5:30 PM