Contemporary Physical Geology |
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Page 159
... fossils may be the dominant constituents ( Fig . 6-53 ) . Former living organisms may become fossils as the result of several natural processes . The largest number of fossils are remains of marine creatures that died and were covered ...
... fossils may be the dominant constituents ( Fig . 6-53 ) . Former living organisms may become fossils as the result of several natural processes . The largest number of fossils are remains of marine creatures that died and were covered ...
Page 197
... fossils were taken . Smith , on the other hand , carefully recorded the occurrence of fossils and quickly became aware that certain rock units could be identified by the particular assem- blages of fossils they contained . He used this ...
... fossils were taken . Smith , on the other hand , carefully recorded the occurrence of fossils and quickly became aware that certain rock units could be identified by the particular assem- blages of fossils they contained . He used this ...
Page 203
... fossils have only limited value in correlation . There are , fortunately , other fossils that are abundant , are widely dispersed around the globe , and are the remains of animals or plants that lived during a relatively short span of ...
... fossils have only limited value in correlation . There are , fortunately , other fossils that are abundant , are widely dispersed around the globe , and are the remains of animals or plants that lived during a relatively short span of ...
Contents
Contents Overview 1 The Scope and Substance of Geology | 1 |
Minerals | 20 |
Igneous Rocks and Processes | 52 |
Copyright | |
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accumulation amount areas atoms basaltic bedrock beds beneath calcium called cause cent chemical clay color composed composition continental continents core Courtesy crystals debris deep-sea deposits depth develop dissolved dolostone dunes earth earthquake eroded erosion eruptions example fault feldspar Figure floodplains flow folds formation fossils geologists glacial glaciers gradient grains granite gravity groundwater igneous rocks ions iron island Lake land lava layers limestone lithosphere located magma magnetic mantle margins mass wasting material melting ment metamorphic rocks meters mid-oceanic ridges minerals mountain move movement occur ocean floor oceanic crust origin oxygen particles plagioclase plane plate plate tectonics pressure quartz reef regions relatively result rhyolite rise River S-waves sand sandstone sea floor sea level sedi sediment sedimentary rocks seismic shale silicate slope soil strata stream structures tectonic temperature texture tion transport trenches tures U.S. Geological Survey valley velocity volcanic water table waves weathering wind