60 NOTE ON THE CONGLOBATED EOEM OE THE 



1890, 



Jan. Pair of Slippers. Mrs. Dinning, Eldon Street. 



,, Model of Native Boat with Outriggers, from Ceylon. 



Mr. S. C. Dutton, St. George's Terrace, Jesmond, 



Mar. Cast, in metal, of Face of au Indian who came into the Arsenal at 



Esqnimault and dropped down dead. Ernest Scott, Esq. 



Donation of Electric Lamps for the permanent lighting of the 



Committee Room, Ladies' Room, Lavatories, Entrance Hall, 



Staircases, and Library of Museum. 



J. W. Swan, Esq., Bj-oinley, Kent. 



IV. — Note on the Conglobated form of the Magnesian-Umestone 

 of the County of Durham. By Eichaed Howse.* 



Most of the members of the Club, especially those who have 

 been accustomed to join in the annual excursion to Marsden and 

 Whitburn, must often have observed the remarkable and varied 

 structure of the Magnesian-limestone exposed in the sea- cliffs, 

 the quarries, and stone walls of the fields on this part of the 

 Durham coast. The stratified masses of rock of a coralloidal 

 and botryoidal appearance are so striking that a geologist is, on 

 a first visit, taken by surprise at the peculiarities of the rock 

 structure so well displayed on many parts of this coast, and the 

 most indifferent and heedless observer can scarcely pass the 

 large masses of Cannon-ball limestone at Eoker without some 

 passing remark. Most persons consider, at first sight, the coral- 

 loidal form of the limestone to be organic. 



These peculiar forms of limestone are characteristic of the 

 Upper series of beds of the Magnesian-limestone, as seen on 

 the coast between Marsden and the "Wear, in the Fulwell Hill 

 quarries, and formerly at Building Hill, in the neighbourhood 

 of Sunderland. 



In no known part of the world are these peculiar lithological 

 forms of rock structure so extensively and so instructively 



♦ Kead at Marsden, October, 1889. 



