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XVII.—Contributions to the Study of the Old Red Sandstone Flora of Scotland. VIII. On Arthrostigma, Psilophyton, and some associated Plant-remains from the Strathmore Beds of the Caledonian Lower Old Red Sandstone

Published online by Cambridge University Press:  06 July 2012

W. H. Lang
W. H. Lang
Affiliation:
Barker Professor of Cryptogamie Botany in the University of Manchester.
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Extract

It is well known that there are two distinct horizons in the Caledonian Lower Old Red Sandstone which contain abundant plant-remains (Evans, 1929). At the lower horizon of the Carmyllie and Cairnconnan Beds the flora consists, so far as is clearly known, of Pachytheca, Nematophyton, Parka, and one vascular plant, Zosterophyllum myretonianum (Lang, 1927). In certain greenish-grey flags and sandstones of the Strathmore Beds near the summit of the stratigraphical succession fragmentary plant-remains are abundant along a line stretching from Rosemount, south of Blairgowrie, through Murthly, Glenalmond, Callander, and Balloch, to near Brodick in Arran. From these beds a small but quite distinct assemblage of fossil plants is known. Pachytheca is clearly recorded. The well-defined remains of vascular plants have so far all been referred to Arthrostigma gracile, Dawson, and Psilophyton princeps, Dawson. References to Psilophyton robustius occur, but there is no evidence that the type of plant distinguished from Gaspé under that name has been found in the Strathmore Beds.

Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 57 , Issue 2 , 1933 , pp. 491 - 521
Copyright
Copyright © Royal Society of Edinburgh 1933

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