Concentric structure in elongate pillows, Amador County, Calif., by W. A. Duffield._______________________________...__________ Ultramafic xenoliths in basalt, Nye County, Nev., by N. J. Trask___-____-___________----_...in Pliocene lacustrine rocks near Rome, Malheur County, Oreg., by R. A. Sheppard and A. J. Gude 3d. Twinning...Authigenic laumontite in arkosic rocks of Eocene age in the Spanish Peaks area, Las Animas County, Colo....(Kansan) molluscan and ostracode faunas, Dickinson County, Kans., by E. D. Gutentag and C. Galli-Olivier__-____ |