Class-book of GeologyMacmillan, 1896 - 404 páginas |
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Página 78
... bottom , varies up to about 200 miles or more . Within this belt of sea , the land- derived materials are distributed over the ocean - floor . Coarse and fine gravel and sand are the most common materials in the areas nearest the land ...
... bottom , varies up to about 200 miles or more . Within this belt of sea , the land- derived materials are distributed over the ocean - floor . Coarse and fine gravel and sand are the most common materials in the areas nearest the land ...
Página 79
... sea , inscribe their records in geological history . It must also be borne in mind that throughout all the sediments of the sea - floor , from the upper part of the beach down to the bottom of the deepest and remotest abyss , the ...
... sea , inscribe their records in geological history . It must also be borne in mind that throughout all the sediments of the sea - floor , from the upper part of the beach down to the bottom of the deepest and remotest abyss , the ...
Página 80
... sea - floor within which this deposition takes place probably does not much exceed a breadth of 200 miles . Beyond that belt , the bottom of the ocean is covered to a large extent with deposits of red clay derived from the decomposition ...
... sea - floor within which this deposition takes place probably does not much exceed a breadth of 200 miles . Beyond that belt , the bottom of the ocean is covered to a large extent with deposits of red clay derived from the decomposition ...
Página 82
... sea - weeds . Peat - bogs . In temperate and arctic countries , marshy vege- tation accumulates in peat - bogs over ... floor . The lowest parts of the peat may contain remains of the reeds , sedges , and other aquatic plants which ...
... sea - weeds . Peat - bogs . In temperate and arctic countries , marshy vege- tation accumulates in peat - bogs over ... floor . The lowest parts of the peat may contain remains of the reeds , sedges , and other aquatic plants which ...
Página 84
... bottom of the water , and accumulate there as a pale gray or straw ... sea - weeds . Yet one further illustration of plant - action in the building ... floor of Antarctic Ocean , magnified 300 diameters ( Challenger Expedition ) ...
... bottom of the water , and accumulate there as a pale gray or straw ... sea - weeds . Yet one further illustration of plant - action in the building ... floor of Antarctic Ocean , magnified 300 diameters ( Challenger Expedition ) ...
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Términos y frases comunes
abundant abundantly accumulated acid Ammonites basin beds bones bottom Brachiopods calcareous calcite Cambrian carbonate of lime Carboniferous Chapter characteristic chiefly clay containing corals Cretaceous crinoids crystalline crystals decay deposits detritus Devonian earth earth's crust Eocene eruptive rocks Europe evidence example extinct fauna feet thick fishes fissures formations fossils genera geological history geologist glacier globe gneiss gradually granite gravel ground iron Jurassic kinds known lakes land lava layers limestone living lower marine marls mass materials Mesozoic miles Miocene molten mountains natural North occur Old Red Sandstone organic remains original Palæozoic period Permian plants and animals Pliocene present preserved probably quartz rain regions represented rivers sand schists sea-floor sediment sedimentary rocks shales sheets shells siliceous Silurian slopes soil solid sometimes species stone strata stratified stream structure substance surface terrestrial Tertiary trace Triassic Trilobites upper valley various vegetation vent volcanic