Vol. 267, Issue 7, 1969

Science Paper
Thermodynamics of Hydrothermal Systems at Elevated Temperatures and Pressures
Harold C. Helgeson
Sufficient thermodynamic data are available to permit calculation of equilibrium constants for a large number of hydrothermal reactions. Where the data are incomplete, the calculations involve entropy estimates, application of...
Science Paper
The Tetrapod-Bearing Continental Triassic Sediments of South America
William D. Sill
Vertebrate faunal sequence, therapsid-to-archosaur transition, associated plant assemblages, geologic setting of Argentine Triassic, correlations
Science Paper
Modal Analysis of Igneous Rocks by X-Ray Diffraction Methods With Examples From Saint Paul’s Rock and an Olivine Nodule
G. OtaloraH. H. Hess
Abundance ratios of mineral pairs, calibration curves, conversion of mode to bulk chemical composition for peridotite mylonite from St. Paul9s Rock and an olivine nodule from Ludlow (California), wet chemical...
Science Paper
Dislocations in the Deformation of Olivine
Chapman Young
Slip systems, dislocation densities, probable quantitative dependence of velocities on applied shear stress
Science Paper
The History of the Earth’s Crust [Book Review]
B. C. Burchfiel
...
Science Paper
Ocean Currents [Book Review]
P. H. LeBlond
...
Science Paper
Computer Applications in Stratigraphic Analysis [Book Review]
G. Pannella
...