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VII.—On the Occurrence of a Fossil Tree (Glyptodendron) in the Clinton Limestone (base of Upper Silurian), of Ohio, U.S.
Published online by Cambridge University Press: 01 May 2009
Extract
During the summer of 1877 I made a geological excursion, in company with one of my students, to the western part of our State, to examine the junction of the Upper Silurian (“Clinton” of the Ohio Survey) and the Cincinnati group of the Lower Silurian. Whilst thus engaged near Eaton, in Preble Co., my companion, Mr. Leven Siler, of that town, picked up and handed to me a slab bearing what appeared to be a mould of the well-known bark of the Lepidodendron, somewhat weathered. More careful examination confirmed the first impression, and convinced me that I had indisputable proof of the existence of arborescent vegetation of an earlier date than had hitherto been announced upon equally conclusive evidence.
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References
page 559 note 1 The fossil was exhibited, and an address given upon it, at a meeting of the Natural History Society of Cincinnati on January 1, 1878. Many gentlemen well acquainted with the geology of this region were there present, and the evidence then and there submitted was unanimously considered conclusive on the age and relations of the fossil.—E. W. C.
page 561 note 1 See Miller's “American Palæozoic Fossils.”
page 561 note 2 S. Lorwayana, given in the above-quoted Catalogue as “Lower Carboniferous,” is from the Middle Carboniferous or Coal-measures of Cape Breton. See Dawson's Report, 1873.
page 561 note 3 This species is omitted in the above Catalogue, but see Dawson's Report, 1873.
page 561 note 4 S. Chemungensis, of the same Catalogue, is a synonym for L. Chemungense.
page 561 note 5 Placed in this column to save space. This position is not inconsistent with the affinity of the species.
page 563 note 1 These little organisms have been of late referred to Algæ.—Editor.
page 564 note 1 “Proceed. American Philosophical Society” (Philadelphia), vol. xvii. No. 100, 1877, p. 163, etc., Leo Lesquereux, “On Land-plants recently discovered in the Silurian Rocks of the United States.” Read October 19th, 1877; printed January 7th, 1878.
Psilophytum grncillimum (p. 164), sp. n.
———— cornutum (p. 165), sp. n.
Annularia Romingeri (p. 166), sp. n.
Sphenophyllum primævum (p. 167), Lesqx.
Protosligma sigillarioides (p. 169), sp. n.—Editor.