. Bulletin of the Geological Society of America. Geology; Geology -- United States. J. F. JAMESâTHE GENUS Figure 5âScolithus clintonensis (n. sp.)= Fucoides verticalis, Hall. (After Hall.) ring in the Potsdam sandstone of Canada,* referred to the species as marking the sandstone abundantly over considerable spaces, saying that it consists, "where the rock is weathered, of straight vertical cylindrical holes, of about an eighth of an inch in diameter, descending several inches, and where the rock is unweathered of corres- ponding solid cylinders, composed, apparently, of grains
. Bulletin of the Geological Society of America. Geology; Geology -- United States. J. F. JAMESâTHE GENUS Figure 5âScolithus clintonensis (n. sp.)= Fucoides verticalis, Hall. (After Hall.) ring in the Potsdam sandstone of Canada,* referred to the species as marking the sandstone abundantly over considerable spaces, saying that it consists, "where the rock is weathered, of straight vertical cylindrical holes, of about an eighth of an inch in diameter, descending several inches, and where the rock is unweathered of corres- ponding solid cylinders, composed, apparently, of grains of sand cemented by a slightly calca- reous matrix, more or less tinged with peroxide of iron. Mr. Hall and other American geolo- gists include them among the fucoids of the rock, but they appear to me more like worm- holes. In one or two instances I have perceived that the tubes are interrupted in their upward course by a thin layer of sand, a portion of which descends into them and stops them up; and from this it would appear that the cylin- ders were hollow when the superincumbent sand was spread over them. Whatever may be the origin of the tubes, they strongly mark many beds in the upper portion of the sand- stone throughout the Canadian portions of its ; This opinion has been accepted by most authors who have written upon the genus, although some still adhere to the idea that the fossils are of vegetable origin. In 1857 Mr. J. W. Salter noted f finding in the Stiper stones of Shropshire, Eng- land, vertical tubes similar to Scolithus linearis. He proposed to use the term Scolithus or Scolites for single tubes or burrows, either vertical or horizontal, but the suggestion does not seem to have been accepted. In 1858 was published the Geology of Pennsylvania, by Henry D. Rogers. In the course of this report J Scolithus linearis is alluded to in one place as a plant, and in another as an annelid burrow. In discussing facts relative to the deposition of the
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