The American Journal of Science and ArtsS. Converse, 1888 - Geology |
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Page 56
... strata composing the hill . The lowest bed cut into ( exposed to a little below the rail- road grade ) , was somewhat arched , and consisted of loose , clean , rather fine gravel filled with small fragments of shells . Venus mercenaria ...
... strata composing the hill . The lowest bed cut into ( exposed to a little below the rail- road grade ) , was somewhat arched , and consisted of loose , clean , rather fine gravel filled with small fragments of shells . Venus mercenaria ...
Page 73
... strata of Spitzbergen , and has proved that the material consists in many parts of closely- packed sponge spicules , passing often into a nearly pure trans- lucent chert . The bed at Tempelberg was about three feet thick and contains ...
... strata of Spitzbergen , and has proved that the material consists in many parts of closely- packed sponge spicules , passing often into a nearly pure trans- lucent chert . The bed at Tempelberg was about three feet thick and contains ...
Page 110
... strata . There is little assumption therefore in saying that some of these crystallizations illustrate specifically crystallinic metamorphism , though others may be of the metachemic kind , that is , products of chemical change From the ...
... strata . There is little assumption therefore in saying that some of these crystallizations illustrate specifically crystallinic metamorphism , though others may be of the metachemic kind , that is , products of chemical change From the ...
Page 120
... strata , which , though quite imperfect , he had observed to differ from all the ferns , conifers and cycads of true Jurassic type , and to resem- ble in many respects dicotyledonous leaves . Although aware that certain ferns , such as ...
... strata , which , though quite imperfect , he had observed to differ from all the ferns , conifers and cycads of true Jurassic type , and to resem- ble in many respects dicotyledonous leaves . Although aware that certain ferns , such as ...
Page 122
... strata . Rhetic . The formation called Rhetic , which some regard as the base of the Jura and others as uppermost Trias , is the oldest that has yielded forms which are comparable with any found in the Potomac formation . Such forms are ...
... strata . Rhetic . The formation called Rhetic , which some regard as the base of the Jura and others as uppermost Trias , is the oldest that has yielded forms which are comparable with any found in the Potomac formation . Such forms are ...
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