Page PLATE 1. Map of central Nevada, showing location of places referred to in the text___________-___-__-_-_-___ In packet 2. Stratigraphic sections of Lower and Middle Paleozoic rocks in the vicinity of Eureka, Nev______________ In packet FIGURE 1. Sections of Carboniferous sedimentary rocks at Tyrone Gap, Eureka,' and Diamond Peak.._______________ 4 2. Sketch of geology between Ruby Hill and Adams Hill_:___..
The occurrence of severe pulmonary venous obstruction due to the congenital anomaly known as cor triatriatum in a 19-year-old furniture mover is described. Relentless and massive hemoptysis led to pulmonary edema, and an attempt at surgical correction under unfavorable conditions was not successful. Seven other cases of cor triatriatum in adults are reviewed. The hemodynamic abnormalities closely resemble mitral stenosis, except that pressures in the true left atrium were normal in the presence of elevated pulmonary capillary pressures. The availability of flow across the obstructing membrane during systole as well as diastole is probably the major element in the surprisingly good tolerance of severe degrees of anatomic obstruction for long periods of time. Slow increase in the degree of obstruction could also be a factor. The clinical picture in these patients very closely resembles mitral stenosis. Hemoptysis appeared to be more frequent in cor triatriatum. Features suggestive of the correct diagnosis would include the absence of an opening snap, the absence of a typical murmur of mitral stenosis, regular rhythm, and lesser evidence of left atrial enlargement in the presence of obvious pulmonary hypertension. Five of these patients have undergone successful correction of their disease by operation. Representative films from the first known angiograms in this condition in an adult are reproduced and discussed.
65 67 70 71 71 72 75 Chainman shale 500 ± exposed Black shale with thin interbedded sandstone. Break in section Middle and Late Devonian Devils Gate limestone 500 ± exposed Thick-bedded limestone, locally dolomitized. Break in section-Nevada, Lone Mountain, and Roberts Mountains formations not mapped area recognized in ROCK FORMATIONS 5 TABLE I.-Geologic formations present in the Eureka mining district-Continued Age Name Stratigraphic thickness (in feet) Lithologic character Late Ordovician Hanson Creek formati'on Unconformity? 300 ± exposed Dark-gray to black dolomite. Middle to Late(?) Ordovician Eureka quartzite 300 Thick-bedded vitreous quartzite. Unconformity Early and Middle Ordovician Pogonip group 1,600-1,830 Chiefly cherty thick-bedded limestone at top and bottom; thinner bedded Prospect Mountain quartzite (base 1, 700+ Fractured gray quartzite weathering not exposed) CAMBRIAN SYSTEM PROSPECT MOUNTAIN QUARTZITE The Prospect Mountain quartzite of Early Cambrian age is the oldest rock exposed in the district. Its outcrop forms a discontinuous band along the west side of Prospect Ridge from south of Prospect Peak to Ruby :Hill. From Ruby I-Iill a more easterly band extends southward from the Jackson mine along the ridge on the east side of Zulu Canyon (Nolan, Merriam, and "'\Villiams, 1956, p. 6-7). Throughout this series of exposures, the quartzite is intensely fractured. It forms smooth treeless slopes underlain by joint blocks of. gray medium-grained quartzite that weather pink or light brown. One of the best exposures of the formation is in the floor of Cave Canyon, on the west slope of Prospect Ridge, where about 1,700 feet of beds are exposed. Here, the formation includes locar thin interbeds of greenishgray micaceous shale and a few beds of conglomerate in addition to the dominant quartzite. pink or brown; a few thin interbeds of shale.
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