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Not all publications have extents, not all extents are completely accurate
Geology and ground-water resources of the Balmorhea area, western Texas
Walter N. White, H. S. Gale, S. Spencer Nye
1941, Water Supply Paper 849-C
Balmorhea is the center of a thriving farming community, the lands of which are irrigated with water derived chiefly from large springs but partly from the storm flow of Toyah Creek. The storm flow of the creek and a part of the winter flow of the springs is stored in...
Geology of the Moreno Valley, New Mexico
L.L. Ray, J.F. Smith Jr.
1941, Geological Society of America Bulletin (52) 177-210
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....
Igneous rocks of the Highwood Mountains, Montana: Part VI. Mineralogy
E.S. Larsen, C.S. Hurlbut, Bennett Frank Buie, C.H. Burgess
1941, GSA Bulletin (52) 1841-1856
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...
Igneous rocks of the Highwood Mountains, Montana: Part VII. Petrology
E. S. Larsen Jr., C.S. Hurlbut, C.H. Burgess, Bennett Frank Buie
1941, GSA Bulletin (52) 1857-1868
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...
Igneous rocks of the Highwood Mountains, Montana: Part V. Contact Metamorphism
Esper Signius Larsen Jr., Bennett Frank Buie
1941, GSA Bulletin (52) 1829-1840
Very near the contacts of the stocks the sediments have been replaced by sanidine and diopside, through magmatic reaction.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...
Igneous rocks of the Highwood Mountains, Montana: Part II. The Extrusive Rocks
E. S. Larsen Jr.
1941, GSA Bulletin (52) 1733-1752
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...