402 Br. T. J. Jehu — The Highland Border Series. 



Summary. — (1) The reptiles Gordonia, Geikia, and Elginia are 

 shown to be slightly later than those of the Upper Permian 

 Pariasaurus beds of Russia, or those of the equivalent Cisticephalus 

 zone of South Africa. They therefore represent the extreme top of 

 the Permian. (2) The remaining Elgin reptiles are Middle Triassic 

 (? = Lettenkohle of Germany). (3) The Elgin footprints are widely 

 distinct from Triassic forms and from those of the Lower Permian, 

 while agreeing exactly with the group associated with the Magnesian 

 Limestone of England. They therefore represent the extreme top of 

 the Permian. (4) The discovery is recorded of one of the typical 

 footprints in close proximity with the Permian reptile quarry. 

 (5) The Permian rocks occupy the west of the 'Triassic' area, the 

 true Trias the east. (6) It is suggested that the area was a land- 

 surface during Permian and Triassic times. 



Eefeeences. 



1. Hardakek, W. H. " The ' Permian ' Rocks of Hampstead " : Q.J.G.S., 



vol. Ixviii, p. 639, 1912. 



2. HiCKLiNG, G. "Footprints from the Permian of Mansfield": Q.J.G.S., 



vol. Ixii, p. 125, 1906. 



'6. " British Permian Footprints " : Proc. Manch. Lit. and Phil. Soc, 



vol. liii, No. 22, 1909. 



4. HUENE, F. von. " Ein primitiver Dinosaur aus der mittleren Trias von 



Elgin ';.: Geol. u. Palaont. Abh., N.F., viii, Heft vi, p. 23, 1910. 



5. " tjber einen echten Ehynchocephalen aus der Trias von Elgin " : 



Neues Jahrb. f. Mineralogie, vol. ii, p. 29, 1910. 



6. "On the Age of the Eeptile Faunas contained in the Magnesian 



Conglomerate at Bristol and in the Elgin Sandstones" : Geol. Mag., 

 1908, p. 99. 



7. Pabst, W. "Die Tierfahrten in dem Rothliegenden Deutschlands " : 



Nov. Act. Acad. Cses. Leop. -Carol., vol. Ixxxix, p. 838, 1908. 



8. Shrubsole, R. L. "The Relationship of the Permian to the Trias in 



Nottinghamshire " : Q.J.G.S., vol. Ixvii, p. 75, 1911. 



9. Watson, D. M. S. "The 'Trias' of Moray": Geol, Mag., Dec. V, 



Vol. VI, p. 103, 1909. 



y. — Note on the Highland Boeder Series, near Aberfoyle. 



By T. J. Jehu, M.A., M.D., F.R.S.E., F.G.S., Lecturer in Geology at the 

 University of St. Andrews. 



ri^HE rocks of this series form an interrupted belt along the southern 

 J. border of the Highlands from Stonehaven on the east to the 

 island of Arran on the west, and they appear again on a more 

 extensive scale in Ireland. In Scotland the series consists of cherts 

 or jaspers and shales, sometimes associated with limestones and with 

 some peculiar igneous rocks. The age of the series has been for years 

 a matter of controversy. Many geologists have held that these 

 rocks are of pre-Cambrian age, but Messrs. Peach & Home in their 

 volume on The Siluria7i Roclcs of Britain (Mem. Geol. Surv., 1899) 

 remarked on the close resemblance of the rocks of this belt to some 

 of the Arenig rocks in the Southern Uplands of Scotland, and the 

 belt has been marked on the Geological Survey maps as doubtfully 

 Lower Silurian. 



