Auriferous Conglomerates of the Gold Coast. 171 



The paper contains a hcmeral time-table of the Eojurassic Period 

 and part of the Neojurassic, a genealogical table of Ammonite- 

 development during the same and a previous portion of time, notes 

 on certain generic names, and a list of the Ammonite-genera 

 referred to. 



April 20th.— AY. Whitaker, B.A., F.K.S., President, 

 in the Chair. 



The following communications were read : — 



1. ' Note on an Ebbing and Flowing Well at Newton Nottage 

 (Glamorganshire)/ By H. G. Madan, Esq., M.A., F.C.S. 



This well lies in a direct line drawn north and south from the 

 church of Newton Xottage to the sea, about 80 yards south 

 of the church and 500 yards from the sea. Sand-hills about 

 20 or 30 feet high lie between it and the sea. A range of Car- 

 boniferous Limestone cliffs runs east and west to the north of 

 the church, while the same formation crops out in the sea at 

 half-tide level. Between the two there is a band of Keuper con- 

 glomerate covered in one place at least by 7 feet of brown loamy 

 clay with pebbles. At the shore-junction of conglomerate and 

 limestone numerous springs occur, and it is in the conglomerate that 

 the well is sunk, its bottom being 8 feet above Ordnance datum. 



A series of about forty observations made at intervals of an 

 hour (and in many cases at the intermediate half-hours), during 

 3 consecutive days, enables the author to construct a curve 

 showing the relationship existing between the rise and fall of the 

 tide on the coast and that of the water in the well. The result is 

 to establish the existence of a wave in the well of the same 

 frequency as the tidal wave, but delayed, or with an establish- 

 ment of, 3 hours {plus or minus a few minutes). 



The analyses of water taken from the well at its highest and 

 lowest show no difference, so that no sea-water enters the well 

 directly. On the other hand, the slight brackishness of the water 

 appears to prove the diffusion of a small amount of salt water into 

 the well. 



2. 'Petalocrinus: By F. A. Bather, Esq., M.A., F.G.S. 



3. ' On the Origin of the Auriferous Conglomerates of the Gold- 

 Coast Colony (West Africa).' By Thomas B. F. Sam, Esq., C.E. 



This paper gives an account of a recent journey from Adjah 

 Bippo to the Ankobra Junction in the Gold Coast Colony. A range 

 of clay-slate hills is succeeded for 6 miles by flat ground in which 

 diorite was found, and that by a lofty hill in which clay-slate 

 dipping east occurs. The Teberibie range with reefs of con- 

 glomerate, and a second range with similar reefs were crossed. 



Gold-bearing alluvia are briefly described, and the gold is 

 supposed to have come from the hills. The Adjah Bippo, Takwa, 

 and Teberibie formations are considered to be part of a syncline. 

 Some conclusions are drawn as to the method of formation and 

 probable auriferous character of the rocks. 



