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Igneous rocks of the Highwood Mountains, Montana: Part VII. Petrology

In the shonkinite series olivine, leucite, and analcime crystallized only from magmas with over 20 per cent of mafites. At this stage the leucite and analcime inverted to pseudoleucite. Pyroxene crystallized over the whole range of rocks and changed little in composition until the magma reached the composition of nepheline syenite when it became richer in aegirite. A little pale biotite crystalliz
Authors
E. S. Larsen, C.S. Hurlbut Jr., C.H. Burgess, Bennett Frank Buie

Igneous rocks of the Highwood Mountains, Montana: Part V. Contact Metamorphism

Very near the contacts of the stocks the sediments have been replaced by sanidine and diopside, through magmatic reaction. An irregular zone of indurated sediments, produced largely by hydrothermal agents, extends outward from the stocks for as much as half a mile. Locally, more intense hydrothermal metamorphism has formed orthoclase and fibrous amphibole with some diopside and locally garnet, phl
Authors
Esper Signius Larsen, Bennett Frank Buie

Igneous rocks of the Highwood Mountains, Montana: Part II. The Extrusive Rocks

Early eruptions of quartz latites, rather rich in potash, built up a volcanic mountain over 30 miles across on an irregular surface of late Cretaceous sediments. Erosion then removed much of the quartz latite. Renewed volcanism formed a volcano made up of basaltic rocks (mafic phonolite) that covered the quartz latites. The phonolites vary in texture and in the kind and proportion of the felsic mi
Authors
E. S. Larsen

Raising badgers in captivity

No abstract available.
Authors
Section of Fur Resources U.S. Division Of Wildlife Research

Angora rabbit wool production.

No abstract available.
Authors
George S. Templeton

Raising mealworms

No abstract available.
Authors
Franklin H. May

Seasonal fox rations and quantities to feed

No abstract available.
Authors
Charles Francis Bassett

Annotated list and index of Wildlife Leaflets 101-200

No abstract available.
Authors
W.L. McAtee

Notes on the elasticity of the Lloyd sand on Long Island, New York 

The Lloyd sand is a productive artesian aquifer underlying all of Long Island except the westernmost part. It rests unconformably upon a floor of crystalline rock that slopes toward the southeast at about 100 feet to the mile. Locally the bed‐rock surface has a relief of more than 100 feet. The Lloyd sand consists of white quartz‐sand and gravel, with some layers of clay. It is considered to be pa
Authors
C. E. Jacob

Polished areas on granitic porphyries of the Hueco and Cornudas Mountains of Texas and New Mexico 

No abstract available.
Authors
Walter B. Lang

Mosses in the Virginia Caverns

No abstract available.
Authors
Walter B. Lang

Ground‐water inventory in the Upper Gila River Valley, New Mexico and Arizona: Scope of investigation and methods used

The Division of Ground Water of the Geological Survey, United States Department of the Interior, has been making an inventory of the water‐resources of the upper Gila River since January 1, 1940. Funds for the project are furnished under a cooperative agreement with the Arizona State Water Commissioner, supplemented by a substantial grant from the United States Engineer Office of the War Departmen
Authors
S.F. Turner, L.C. Halpenny