Bulletin - United States Geological Survey Nos. 349-354
Bulletin - United States Geological Survey Nos. 349-354
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The Hardgrave sandstone at several points is in contact with the Mormon sandstone, but, as we shall see later, it is the result of faulting.
The Hardgrave sandstone is almost everywhere in contact on the one hand with an ancient rhyolite and on the other with meta- andesite. The metarhyolite is on the western side of the Hardgrave sandstone and lies upon it. The sandstone throughout its coiu'se in both belts dips westward beneath the ancient rhyolite and is com- posed, as already pointed out, o...f lapilli and debris derived from the rhyolite. It is therefore younger than the rhyoUte, and their posi- tion has been reversed by overturning.
The contact of the Hardgrave sandstone with the meta-andesite along its eastern border is less regular than that of the metarhyolite on its western. The dip of the sandstone is west, and in many places it appears to rest directly on the meta-andesite, which passes beneath it with the same inclination. In other places — and these are important — the igneous rock breaks through the bedding and incloses many fragments of the sandstone, showing clearly that its eruption took place after the sandstone was deposited.
What to read after Bulletin - United States Geological Survey Nos. 349-354?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey Us to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The Hardgrave sandstone at several points is in contact with the Mormon sandstone, but, as we shall see later, it is the result of faulting.
The Hardgrave sandstone is almost everywhere in contact on the one hand with an ancient rhyolite and on the other with meta- andesite. The metarhyolite is on the western side of the Hardgrave sandstone and lies upon it. The sandstone throughout its coiu'se in both belts dips westward beneath the ancient rhyolite and is com- posed, as already pointed out, o...f lapilli and debris derived from the rhyolite. It is therefore younger than the rhyoUte, and their posi- tion has been reversed by overturning.
The contact of the Hardgrave sandstone with the meta-andesite along its eastern border is less regular than that of the metarhyolite on its western. The dip of the sandstone is west, and in many places it appears to rest directly on the meta-andesite, which passes beneath it with the same inclination. In other places — and these are important — the igneous rock breaks through the bedding and incloses many fragments of the sandstone, showing clearly that its eruption took place after the sandstone was deposited.
What to read after Bulletin - United States Geological Survey Nos. 349-354?
You can find similar books in the "Read Also" column, or choose other free books by Geological Survey Us to read onlineMoreLess
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