REPRINTED FROM 

 THE 



JOURNAL OF GEOLOGY 



NOVEMBER-DECEMBER, igio 



A CENTRAL AFRICAN GLACIER OF TRIASSIC AGE^ 



SYDNEY H. BALL AND MILLARD K. SHALER 

 New York City, N.Y. 



INTRODUCTION 



From June, 1907, to June, 1909, the writers directed the pros- 

 pecting work of the Societe Internationale Forestiere et Miniere 

 du Congo in the Belgian Congo, more familiarly known by its 

 former name, the Congo Free State (Fig. i). In the zone of the 

 Maniema (Fig. 2), in the eastern part of the colony, evidences of 

 glacial action of Jura-Triassic age were noted, which seem worthy 

 of description. 



The data of a scientific nature were collected during the two years 

 passed in the Belgian Congo, incidental to an economic recon- 

 naissance of the country, and is consequently of a fragmentary 

 character. Difficulties of work in a partially explored tropical 

 country also explain the lack of detail in this paper. Topography 

 by R. B. Oliver is the base used, and field notes by A. E. Smith are 

 drawn upon in the preparation of this paper. 



LOCATION AND AREA 



Belgian Congo lies in southwestern Central Africa to the west 

 of the Continental Divide. It has a coast line of but twenty miles 

 on the Atlantic, but widens rapidly eastward to points 5 degrees 

 north and 14 degrees south of the equator. Its area is 908,000 



' Published by permission of the Societe Internationale Forestiere et Miniere 

 du Congo. 

 Vol. XVIII, No. 8 681 



