. The geological history of plants. Paleobotany; 1888. 40 THK GEOLOGICAL HISTORY OF PLANTS. [ shales and limestones of the Silurian owe their, carbona- I ceous matters to the decomposition of Algse, though pos- 1 sibly some of it may have been deriTed from Graptolites and other corneous Zoophytes. In any case, such micro-. Fio. li.—Silurian vegetation restored. I^otannularia.^ Berwynia, Nema- tophyton, Sphenophyllum^ AHlirosHgma, Fnlophyton. Ecopic examinations of these shales as I have made, have not produced any evidence of the existence of plants of higher grade, while those of the Erian an
. The geological history of plants. Paleobotany; 1888. 40 THK GEOLOGICAL HISTORY OF PLANTS. [ shales and limestones of the Silurian owe their, carbona- I ceous matters to the decomposition of Algse, though pos- 1 sibly some of it may have been deriTed from Graptolites and other corneous Zoophytes. In any case, such micro-. Fio. li.—Silurian vegetation restored. I^otannularia.^ Berwynia, Nema- tophyton, Sphenophyllum^ AHlirosHgma, Fnlophyton. Ecopic examinations of these shales as I have made, have not produced any evidence of the existence of plants of higher grade, while those of the Erian and Carboniferous periods, similar to the naked eye, abound in such evi- dence. It is also to be observed that, on the surfaces of «. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Dawson, John William, Sir, 1820-1899. New York, D. Appleton and Company
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