. The geological history of plants [microform]. Paleobotany; Paléobotanique. LAURENTIAN AND EARLY PALEOZOIC. 37 fronds smooth and slightly striate longitudinally, with curved and intermixed stria). kStem thick, bifurcating, the divisions terminating in irregularly pinnate fronds, apparently truncate at the extremities. The quan- tity of carbona- ceons matter pres- ent would indicate thick, though per- haps flattened, stems and dense fleshy fronds. The species Butliotrcphis sub- nodosa and B. jlexuosa, from the Utica shale, are also certain- ly plants, though it is possible, if their structures
. The geological history of plants [microform]. Paleobotany; Paléobotanique. LAURENTIAN AND EARLY PALEOZOIC. 37 fronds smooth and slightly striate longitudinally, with curved and intermixed stria). kStem thick, bifurcating, the divisions terminating in irregularly pinnate fronds, apparently truncate at the extremities. The quan- tity of carbona- ceons matter pres- ent would indicate thick, though per- haps flattened, stems and dense fleshy fronds. The species Butliotrcphis sub- nodosa and B. jlexuosa, from the Utica shale, are also certain- ly plants, though it is possible, if their structures and fruit were known, some of these might be referred to differ- ent genera. All of these plants have either car- bonacGous matter or produce organ- ic stains on the matrix. The organism. Fio. 13.—Buffi of rep/lift Grnnfii, u j»enuinc Alga frum the Siluriun, Ciinuda. diverging with wedge-shaped fronds, described by Hall as Sphenothalhis aiKjustifolius, is alsc -i. plant. Fine specimens, in the collection of the Geologic^,! Survey of Canada, show dis-. 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, J. W. (John William), Sir, 1820-1899. New York : D. Appleton
Size: 1162px × 2152px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, booksubjectpaleobo, bookyear1888
