. Dawn of life: being the history of the oldest known fossil remains, and their relation to geological time and to the development of the animal kingdom. Paleontology; Eozoon; Life. 162 THE DAWN OF LIFE. system; and one of the most Eozoon-like I liave seen^ is a specimen of the undescribed species already men- tioned from the Guelph (Upper Silurian) limestone of Ontario, collected by Mr. Weston, and now in the Museum of the Geological Survey. I have attempted to represent its structures in fig. 44. In the rocks extending from the Lower Silurian and perhaps fi^om the Upper Cambrian to the Devon
. Dawn of life: being the history of the oldest known fossil remains, and their relation to geological time and to the development of the animal kingdom. Paleontology; Eozoon; Life. 162 THE DAWN OF LIFE. system; and one of the most Eozoon-like I liave seen^ is a specimen of the undescribed species already men- tioned from the Guelph (Upper Silurian) limestone of Ontario, collected by Mr. Weston, and now in the Museum of the Geological Survey. I have attempted to represent its structures in fig. 44. In the rocks extending from the Lower Silurian and perhaps fi^om the Upper Cambrian to the Devonian inclusive, the type and function of Eozoon are con- tinued by the Stromatoporge, and in the earlier part of. Fig. 46. Beceptaculites, restored. {After Billings.) (a.) Aperture, (b.) Inner wall, (c.) Outer wall, (n.) Nucleus, or primaiy chamber. (v.) Internal cavity. this time these are accompanied by the Archaeo- cyathids, and by another curious form, more nearly allied to the latter than to Eozoon, the Recepta- culites. These curious and beautiful fossils, which sometimes are a foot in diameter, consist, like Archseo- cyathus, of an outer and inner coat enclosing a cavity ; but these coats are composed of square plates with. 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. London, Hodder & Stoughton
Size: 1603px × 1559px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1870, booksubjectpaleontology, bookyea
