. The geological history of plants. Paleobotany; 1888. THE CABBONITEROirS FLOEA. 119. relation to our modern equisetnms, or mare's-tails, but, as in other cases we have met with, are of gigantic size and comparatively complex structure. Their stems, in cross-section, show radi- ating bundles of fibres, like those of exogenous woods, yet the whole plan of structure presents some curious resemblances to the stems of their hum- ble successors, the mod- ern mare's-tailsi It would seem, from the manner in which dense brakes of these Galamites have been preserved in the coal-for- mation of Nova Scot
. The geological history of plants. Paleobotany; 1888. THE CABBONITEROirS FLOEA. 119. relation to our modern equisetnms, or mare's-tails, but, as in other cases we have met with, are of gigantic size and comparatively complex structure. Their stems, in cross-section, show radi- ating bundles of fibres, like those of exogenous woods, yet the whole plan of structure presents some curious resemblances to the stems of their hum- ble successors, the mod- ern mare's-tailsi It would seem, from the manner in which dense brakes of these Galamites have been preserved in the coal-for- mation of Nova Scotia, that they spread over low and occasionally inun- dated flats, and formed fringes on the seaward sides of the great Sigilla- ria forests. In this way they no doubt contrib- uted to prevent the invasion of the areas of coal ac- cumulation by the muddy waters of inundations, and thus, though they may not have furnished much of the material of coal, they no doubt contributed to its purity. Many, beautiful plants of the genera AsterophyUites and Annularia are supposed to have been allied to the Oala- miUsyOT to have connected them with the RUzocarps. The stems and fruit of these plants have strong points of resemblance to those of SphenopJiyllum, and the leaves are broad, and not narrow and angular like those of the true Calamites {Fig. 43). No one has done more than my friend Dr. William- fc*5 .Si. â¢^* â ^fK^ Fig. 42.âErect SigiUaHd, standing on a coal-seam (S, Joggins, Nova. 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
Size: 1374px × 1818px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthordawsonjo, bookcentury1800, bookdecade1880, bookyear1888
