About the Editors

 Claudio Bartolini received his B.S. degree in geology from the University of Sonora, Mexico. He earned an M.S. degree in geology from the University of Arizona, and after graduation worked for four years as an exploration geologist for Gold Fields Mining Corporation in Arizona, California, Nicaragua, and Mexico. Subsequently, he enrolled at the University of Texas at El Paso, and earned a Ph.D. in geology (tectonics and sedimentary basins) in 1998. After finishing his doctoral program, he joined ARCO International Company, Latin America exploration group. Bartolini is the senior editor of the 1999 Geological Society of America Special Paper 340, Mesozoic Sedimentary and Tectonic History of North-Central Mexico. He has organized several symposia on the geology of Mexico, and is one of the founders of the new Latin American Association of Earth Sciences (www.alacit. org). He has focused his research on the Paleozoic and Mesozoic regional geology, plate tectonics, and sedimentation of Mexico. Bartolini is presently employed with the IHS Energy Group in Houston, Texas, where he is involved in research on oil and gas fields in Mexico, Central America, and the Caribbean.

 Richard T. Buffler received his B.S. in geology from the University of Texas at Austin in 1959 and his Ph.D. in geology from the University of California, Berkeley, in 1967. After short stints with Shell Oil Company, Shell Development Co., and the University of Alaska, he joined the University of Texas Institute for Geophysics (then located in Galveston) in 1975 as a research scientist. Shortly thereafter, he joined the faculty of the Department of Geological Sciences in Austin. While in Galveston, Buffler began his career as a marine geologist/geophysicist, as well as his long-term work on the geologic history of the Gulf of Mexico Basin, which he continues today, based in Austin. His most recent Gulf projects involve an industry-sponsored basinwide synthesis of the Cenozoic history of the basin and a geophysical study of the Chicxulub K/T impact crater on Yucatán. He also recently has returned to his land roots with geologic field projects in Eritrea, Eastern Java, and northern Mexico and along the New Mexico/Arizona border.

 Abelardo Cantú-Chapa is a Mexican paleontologist with experience in the paleontology and biostratigraphy of Mexico. He earned his bachelor’s degree from the University of Nuevo León and the Instituto Politécnico Nacional in 1956. After two years as a micropaleontologist, working in the Burgos Basin for Petróleos Mexicanos (PEMEX), he studied sedimentology and sedimentary petrography at the Maritime Station d’Endoume of the University of Marseille and the French Petroleum Institute in Reuil Malmaison, Paris. In 1962, he earned his doctorate from the Université de France at the Sorbonne in Paris with his dissertation on the biostratigraphy of Upper Jurassic and Cretaceous ammonites of Mexico. On returning to Mexico, Cantú-Chapa was appointed director of the Macropaleontology Laboratory at the Instituto Mexicano del Petróleo. There, he was responsible for the study of Mesozoic ammonites of Mexico. From 1966 to 1987, he was a research scientist at the same institute, where he continued his studies of ammonites and of core and cuttings samples from PEMEX wells. Cantú-Chapa is currently chairman of the Graduate School of Geology and professor of paleontology and stratigraphy at the Instituto Politécnico Nacional in Mexico City. A specialist in Mesozoic ammonites, he has published numerous stratigraphic studies, utilizing logs and core and outcrop data for most regions of Mexico. He has also published a systematic study of Mexican Paleozoic cephalopods.