W. Weigand. Department of Geological Sciences, California State University, Northridge, CA 91330-8266 Tel. ... A *Ar/aquot;Ar date of 15.80 Ap 0.08 Ma, measured on 5 plagioclase grains in an andesite clast from the lowermost member, is consistent with a Relizian ... Spider-diagram patterns show small negative spikes for Ba, Th, Nb, P, and Ti and slight positive spikes for Sr and Zr-Hf. These samples lack theanbsp;...
|Title||:||The Fourth California Islands Symposium|
|Author||:||William Lee Halvorson, Gloria J. Maender, Santa Barbara Museum of Natural History|