﻿1850.] TRIMMER ON THE ERRATICS OF NORFOLK. 



19 



November 20, 1850. 



George Edward Gavey, Esq., and Dr. James Macfadyen, were 

 elected Fellows. Prof. B. Studer and Prof. Hermann von Meyer 

 were elected Foreign Members. 



The following communications were read : — 



1. Notice of the occurrence of an Earthquake at Brussa. 



[Communicated from the Foreign Office, by order of Viscount Palmerston.] 



On the night of the 19th April, 1850, at half-past eleven p.m., a 

 shock of considerable violence occurred at Brussa, in Anatolia, last- 

 ing from eight to ten seconds. The oscillation seemed to proceed 

 from S. or S.W. This was followed by two other shocks during the 

 night, and by four others at intervals up to the 21st, all compara- 

 tively slight. The same earthquakes were felt throughout the country 

 as far as Kiutahiyah, particularly at Muhelitsch (forty miles W. of 

 Brussa), at Lubat, on the Lake Apollonia, and at Kirmasli (forty miles 

 S.W. of Brussa), on the south side of the lake, at which latter place 

 there was a temporary gush of water and sand from an opening in 

 the earth. It was noticed that the strongest shocks followed shortly 

 after heavy storms of hail, and also that at Zehekerghe, near Brussa, 

 a momentary stoppage of the mineral springs accompanied the earth- 

 quake. 



2. Generalizations respecting the Erratic Tertiaries or 

 Northern Drift, founded on the Mapping of the Super- 

 ficial Deposits of a large portion of Norfolk. With a 

 Description of the Freshwater Deposits of the Gayton- 

 thorpe Valley ; and a Note on the Contorted Strata of 

 Cromer Cliffs. By Joshua Trimmer, Esq., F.G.S. 



In exhibiting to the Society a map of the variations of soil over a 

 considerable portion of Norfolk, by which the dependence of those 

 variations on contours is shown, I avail myself of the opportunity to 

 communicate a brief outline of the conclusions to which I have been 

 led, respecting the erratic phsenomena, by a very minute examination 

 of a district where they are well exhibited, and where their place in 

 the geological scale of time is well defined. 



These variations were laid down by me, during parts of the years 

 1844, 1845, and 1846, on the Ordnance Map — a work which was 

 undertaken as the basis of a paper on the Distribution of Soils, 

 written for the Journal of the Royal Agricultural Society*. In that 

 paper I confined myself, as much as possible, to subjects having a 

 practical agricultural interest ; reserving others of a purely geological 

 character for publication in some scientific journal. They were em- 

 bodied, at the request of Sir Henry De la Beche, in a memoir which 



* Vol. vii. part ii. 



c 2 



