Diatoms are the most diverse group of algae, playing a major role in global carbon and silicon cycles (Kidder and Erwin, 2001; Armbrust, 2009) and inhabiting virtually any environment that provides moisture and sunlight (Mann, 1999). Thus, they offer important information to help reconstruct paleoen-vironments and clarify stratigraphic relationships. Their strati-graphic range extends down at l...

Conodonts representing 38 species of 26 genera have been identified in samples from Upper Ordovician rocks at three central Nevada localities. Ranges of these species and associated graptolites are used graphically to determine correlation of the strata considered with an evolving composite standard that includes information from Ordovician strata at more than 100 localities in North America. R...

Lithological characteristics of the Asmari Formation in the Burujen area are: pelagic foraminifera wackestone-packstone; bentic foraminifera echinid packstone; bentic foraminifera corallinaceapackstone; coral boundstone and echinid corallinacea packstone to grainstone; corallinacea boundstone; corallinacea bryozoa packstone; rniliolid echinid wackestone; and bioclastic wackestone. The exami...

a Department of Earth Sciences, University of Milan, Via Mangiagalli 34, I-20133 Milan, Italy b ALP — Alpine Laboratory of Paleomagnetism, via Madonna dei Boschi 76, I-12016 Peveragno (CN), Italy c Earth and Planetary Sciences, Rutgers University, Piscataway, NJ 08854, U.S.A. d Lamont-Doherty Earth Observatory, Palisades, NY 10964, U.S.A. e Department of Geosciences, University of Padova, Via G...