138 Reports d: Proceedings — EdinbargJi. Geological Society. 



localities are not so exceptional as they appear to be at first sight ; 

 and that English localities may be studied with advantage, in 

 comparison with and exjilanation of the features of these Continental 

 deposits. 



(7) It is found that the preserved strata of the Gloucestershire- 

 Worcestershire Lias under consideration hajDpen in the main to be 

 deposits of dates when the living Ammonites were rather small ; 

 while there is faunal failure and presumably stratal failure at the 

 times when large Ammonites flourished. The converse phenomena 

 are mainly illustrated by North Somerset deposits. 



(8) The times when large and small Ammonites lived appear to 

 follow one another like waves, illustrated even in a short table of 

 Liassic dei:)osits. 



(9) As a result of the investigations connected vfith this paper 

 it seems to be advisable, for recording purposes at any rate, to make 

 further subdivisions in the scheme set forth in the author's former 

 paper. 



Edinburgh Geological Society. 



Novemher 19, 1919.— Mr. E. B. Bailey, M.C., B.A., F.G.S., President, 



in the chair. 



1. "Notice of a Shrimp-bearing Limestone in the Calciferous 

 Sandstone Series near Granton." By D. Tait, H.M. Geological 

 Survey. 



This is a new fossiliferous locality, which is exposed between tide- 

 marks near Muirhouse, about midway between Cramond and 

 Granton. The chief feature of this bed lies in the remarkable 

 abundance of fossil shrimps which it contains, some of which may 

 be new species. It is 18 inches thick, but is not a solid bed. 

 It is composed of thin bands of limestone with partings of shale. 

 It varies in thickness, and the individual bands, Avhich are finely 

 laminated, have minutely wrinkled surfaces and shrinkage cracks 

 due to drying. 



What is probably the same band is exposed 4 feet above the 

 sandstone of Granton (Sea) Quarry, and again in Granton (Land) 

 Quarry. The horizon of this band is, therefore, low down in the 

 Granton Sandstone Series. 



The fossils obtained from the limestone to this date are Ortkoceras, 

 Nautilus, Estheria, at least three species of shrimps, and the fishes 

 Rhaclinichthys brevis Traq. and Eurynotus crenatus Agassiz. The 

 fishes were determined by Dr. Smith Woodward of the British 

 Museum. 



The lithological description of this bed at Granton, though it 

 is peculiar, applies exactly also to the well-known shrimp limestone 

 at Cheese Bay near GuUane ; this and the similarity of their fossil 

 contents tempts one to correlate them with each other. But 

 Dr. Peach says the species of shrimps found in the Granton Bed are 



