On the evidence afforded by fossil plants, as to the boundary line between the Devonian and Carboniferous rocks / by Samuel Haughton.

  • Haughton, Samuel.
Date:
1855
Catalogue details

Licence: Public Domain Mark

Credit: On the evidence afforded by fossil plants, as to the boundary line between the Devonian and Carboniferous rocks / by Samuel Haughton. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    2. In the slaty and sandy beds underlying the synclinal axis of Carboniferous limestone at Tallow Bridge, county of Waterford, both to the north and south of the basin, a rich collection of fossil plants occurs, among which the following are the most remarkable:— 1. Lepidodendron Sternbergi.—Ad Brong. 2. Stigniaria (ficoides ?) 3. Sigillavia dichotoma. 4. Filicites dichotoma. 6. Lepidodendron minututn. The first of these plants, although the impression is obscure, I have little doubt is correctly named L. Sternbergi, and is specifically identical with the well-known plant of the coal-measures. The Stigmaria is not identical with S.Jicoides, from which it differs in the fact of the stigmata lying closer to each other than in S.ficoides. Measured in one direction, there are nine stigmata per inch, and in the other direction, nine stigmata in two inches. I have named Sigillaria dichotoma a very remarkable and abun- dant fossil, which occurs in lengths sometimes of six feet, and which would be taken for a Calamite were it not for the want of SioiLLARiA DICHOTOMA, from Tallow Bridge, county of Waterford, showing the bifurcation of the stem and the circular spirally arranged, stigmata. articulations. A perfect series of this plant has been formed by me from the specimens in Dr. Griflftth's collection, in which the passage may be traced from the large, finely striated, dichotomous Sigillaria