The American Journal of Science and ArtsS. Converse, 1888 - Geology |
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Page 120
... cycads of true Jurassic type , and to resem- ble in many respects dicotyledonous leaves . Although aware that certain ferns , such as Dictyophyllum , Thaumatopteris and Clathropteris , having decidedly net - veined fronds , have been ...
... cycads of true Jurassic type , and to resem- ble in many respects dicotyledonous leaves . Although aware that certain ferns , such as Dictyophyllum , Thaumatopteris and Clathropteris , having decidedly net - veined fronds , have been ...
Page 122
... cycads , 112 conifers , 76 dicotyledons , and 12 species whose systematic position is not definitely known . Of this number , 354 are new species , leaving only 16 species which are common to the Potomac and other formations . But in ...
... cycads , 112 conifers , 76 dicotyledons , and 12 species whose systematic position is not definitely known . Of this number , 354 are new species , leaving only 16 species which are common to the Potomac and other formations . But in ...
Page 126
... cycads , 35 conifers , and 17 dico- tyledons , and as the lower types are somewhat more promi- nently represented in the lower formations and the higher in the higher , this relation may perhaps be best shown in the fol- lowing form ...
... cycads , 35 conifers , and 17 dico- tyledons , and as the lower types are somewhat more promi- nently represented in the lower formations and the higher in the higher , this relation may perhaps be best shown in the fol- lowing form ...
Page 128
... cycads in the Trias , or lower Jura ; 24 ferns , two cycads and five conifers in the Oolite , and two ferns and eight conifers in the upper Jura ( Corallian and Kimmeridgian ) . These species , of course , over- lap and recur in the ...
... cycads in the Trias , or lower Jura ; 24 ferns , two cycads and five conifers in the Oolite , and two ferns and eight conifers in the upper Jura ( Corallian and Kimmeridgian ) . These species , of course , over- lap and recur in the ...
Page 130
... Cycads , Conifers , and even the Monocotyledons , and containing comprehensive types prophetic of many of the now fully de- veloped families of Dicotyledons . They therefore form just such a homogeneous and undifferentiated group of ...
... Cycads , Conifers , and even the Monocotyledons , and containing comprehensive types prophetic of many of the now fully de- veloped families of Dicotyledons . They therefore form just such a homogeneous and undifferentiated group of ...
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