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Water levels and artesian pressure in observation wells in the United States, 1940, Part 1, Northeastern States
No abstract available.
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Water levels and artesian pressure in observation wells in the United States, 1940, Part 2, Southeastern States
No abstract available.
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Water levels and artesian pressure in observation wells in the United States, 1940, Part 3, North-Central States
No abstract available.
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Water levels and artesian pressure in observation wells in the United States, 1941, Part 5, Northwestern States
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Water supply of the Dakota sandstone in the Ellendale-Jamestown area, North Dakota, with reference to changes between 1923 and 1938
The Dakota sandstone underlies most of North Dakota and South Dakota and considerable parts of nearby States. In most of the area that it occupies it is covered with thick deposits of younger formations, chiefly shale, that confine the water in the sandstone under considerable pressure. Where the topography is favorable, as it is in the Ellendale-Jamestown area in southeastern North Dakota, wells
Authors
Leland Keith Wenzel, H. H. Sand
Geology of the Moreno Valley, New Mexico
The Moreno Valley, located along the complex eastern boundary between the Sangre de Cristo Mountains and the Great Plains, is structurally a broad, northwardplunging syncline, disrupted by smaller folds and faults. This major synclinal structure is the result of the Laramide disturbance. Deformation, however, has continued possibly into the Quaternary. Intrusions, probably contemporaneous with tho
Authors
L.L. Ray, J.F. Smith
Igneous rocks of the Highwood Mountains, Montana: Part VI. Mineralogy
The minerals of the igneous rocks of the Highwood Mountains are described. The primary hornblende of the quartz latites is basaltic and it has been partly replaced by a common green hornblende. Hornblende is rare in the alkalic rocks. Augite is an abundant mineral of the alkalic rocks; in the syenites it contains some acmite, especially on the borders of the crystals. Aegirite is a common metamorp
Authors
E.S. Larsen, C.S. Hurlbut Jr., Bennett Frank Buie, C.H. Burgess
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