A magnetic survey was made in Sand Canyon, which is in the northwestern part of the San Gabriel Mountains, the object being to locate possible placer deposits. The bedrock in this area is an iron rich igneous rock which has been intruded by numerous dikes. The stream gravels consist of large boulders interspersed with highly magnetic sands....

Situated in the San Gabriel Mountains of Southern California is a large body of anorthosite which is associated a number of bodies of ilmenitic magnetite. During the summer of 1937, the E. I. duPont de Nemours Corporation obtained options on a group of properties thought to contain several such deposits. In connection with the exploration of the...

It has been customary to class titanium with the rare elements, but in reality it is one of the most abundant of metals. Geochemists have estimated that it constitutes 0.44 per cent of the solid crust of the earth and ranks ninth in relative abundance of the ninety odd elements found there. It is more abundant than the common elements carbon, ph...

It has been customary to class titanium with the rare elements, but in reality it is one of the most abundant of metals. Geochemists have estimated that it constitutes 0.44 per cent of the solid crust of the earth and ranks ninth in relative abundance of the ninety odd elements found there. It is more abundant than the common elements carbon, ph...

The various types of instruments for gravity measurements are briefly discussed. The theory of an inverted pendulum of the "Holweck-Lejay" type with an elastic mounting at its base is given, and an instrument of this design, ninety times as sensitive to differences in gravity as an ordinary pendulum, is described. The theory of the interpretatio...

The various types of instruments for gravity measurements are briefly discussed. The theory of an inverted pendulum of the "Holweck-Lejay" type with an elastic mounting at its base is given, and an instrument of this design, ninety times as sensitive to differences in gravity as an ordinary pendulum, is described. The theory of the interpretatio...

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The San Gabriel anorthosite-syenite body is part of large layered intrusive, part of which underlies about 250 square kilometers in the western San Gabriel Mountains between the San Gabriel and San Andreas fault zones 30 kilometers...

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The San Gabriel anorthosite-syenite body is part of large layered intrusive, part of which underlies about 250 square kilometers in the western San Gabriel Mountains between the San Gabriel and San Andreas fault zones 30 kilometers...

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The San Gabriel anorthosite-syenite body is part of large layered intrusive, part of which underlies about 250 square kilometers in the western San Gabriel Mountains between the San Gabriel and San Andreas fault zones 30 kilometers...

NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. The San Gabriel anorthosite-syenite body is part of large layered intrusive, part of which underlies about 250 square kilometers in the western San Gabriel Mountains between the San Gabriel and San Andreas fault zones 30 kilometers...