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Origin and differentiation of Triassic dolerite magmas, North Carolina, USA
Ten dolerite dikes intruded into Triassic fault troughs in the Piedmont area of North Carolina have been analyzed for the contents of major elements...
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Petrology of the Nandewar Volcano, N.S.W., Australia
The Nandewar Mountains, N.S.W., Australia, are the remains of a Miocene continental alkaline volcano whose products range from olivine basalts to...
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Zur Geologie der Danakil-Senke
Geological and geophysical investigations in the Northern part of Afar-Region were carried out by a group of scientists in 1967 and 1968. The...
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Paläoklimatologische eindrücke aus australien nebst einigen allgemeinen Bemerkungen zur älteren Klimageschichte der Erde
Some observations on the tillites of Australia (especially in the Proterozoic and younger Paleozoic), made during a trip through Australia and mostly...
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Zur Stratigraphie der Kaisberg-Schichten (oberes Namur) im Ruhr-Karbon
The Kaisberg-formation (Upper Carboniferous, Ruhr-district) is about 120 m thick. Its most remarkable horizon is the Kaisberg-conglomerate (18–30 m),...
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The structural control and genesis of alkaline rocks in central Kenya
In the Nairobi area and the adjacent region of the Gregory Rift Valley of Kenya two series of Cainozoic alkaline volcanic rocks, of mildly and...
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An excursion to the Bayuda volcanic field of Northern Sudan
A cluster of well-preserved recent volcanoes in the northern Bayuda Desert make up a more or less continuous field some 520 km 2 in area surrounded by...
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The cainozoic volcanic succession in Ethiopia
The discovery of extensive Pliocene pantellerite welded tuffs in southern Ethiopia necessitates a revision of the Cainozoic volcanic succession...
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A Comparative Study of the Diagenetic Alteration of Clay Minerals in Mesozoic Shales from Papua, New Guinea, and in Tertiary Shales from Louisiana, U.S.A.
Gradual change from 60% montmorillonite/40% illite randomly interstratified clay minerals at 3500 ft depth to 20% montmorillonite/80% illite at...
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The mineralogy and geochemistry of a nickeliferous laterite profile (Greenvale, Queensland, Australia)
A laterite profile on serpentinite at Greenvale, Australia, has been investigated in order to elucidate the formation of the secondary minerals and...
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Faults
Where rocks have undergone observable displacement along a macroscopic shear or fracture plane in the earth they are said to have been faulted. The... -
Radioactivity and Age of Minerals
This chapter is chiefly devoted to methods of dating rocks and minerals. Although geologists have long known much about the relative order in which...