Zöology; a textbook for colleges and universities . From American Naturalist FIG. 33. Fossils from Florissant. Above, a fossil oak leaf, Quercus ramalcyi, andnext to it a living representative, Quercus fendleri, which grows today in , a wing of an extinct dragon fly, Phenacolestes mirandus. Enlarged. THE FLORISSANT SHALES OF COLORADO l6l in many respects very unlike that of the past. In the Themigra-shale are remains of redwood trees ; and there are even extermina-great redwood trunks, now completely silicified, stand- tlon ofing at Florissant. Today the redwood, once widelysprea
Zöology; a textbook for colleges and universities . From American Naturalist FIG. 33. Fossils from Florissant. Above, a fossil oak leaf, Quercus ramalcyi, andnext to it a living representative, Quercus fendleri, which grows today in , a wing of an extinct dragon fly, Phenacolestes mirandus. Enlarged. THE FLORISSANT SHALES OF COLORADO l6l in many respects very unlike that of the past. In the Themigra-shale are remains of redwood trees ; and there are even extermina-great redwood trunks, now completely silicified, stand- tlon ofing at Florissant. Today the redwood, once widelyspread over the northern hemisphere, is making itslast stand, confined to a rather small area in the shale is also the Ailanthus or Tree of Heaven,a genus now confined to eastern Asia. We find in addi-tion leaves of magnolia, elm, beech, chestnut, poplars,pines, and oaks, - - such an assemblage as does not existin the Rocky Mountains today. We are remindedrather of the mixed hardwood forests of the Eastern andSouthern states. We wonder wh
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1920
