Vol. XI] DICKERSON— FAUNA OF THE VIGO GROUP 19 



forms here as they are regarded as excellent horizon deter- 

 miners. 



Dr. W. D. Smith 6 , on the strength of the occurrence of Cy- 

 cloclypeus communis K. Martin, and Lepidocyclina richthofeni 

 Smith, refers the Canguinsa sandstone to the Middle or Lower 

 Miocene. His exact statement is as follows : 



" The limestone from Mount Morabi (fossil locality 



62) contains Cycloclypeus communis K. Martin, which repre- 

 sents the middle Miocene, and large lepidocyclinas some of 

 which are 45 millimeters in diameter and 5 millimeters broad 

 in the thickened central portion. Lepidocyclina richthofeni 

 Smith was identified among these. This species has been re- 

 ferred by Douville to the lower Miocene. 



"No definite age determinations can be made from the fossils 

 in the Canguinsa sandstone proper. The fossils in the included 

 limestone, however, are well known and have been used in 

 correlation by various authorities. From their presence it is 

 concluded that the Canguinsa sandstone should be placed in 

 the middle Miocene, extending, perhaps, into the lower 

 Miocene." 



In a recent publication, "Notes on a Lepidocyclina-Limestone 

 from Cebu," by Prof. H. Yabe 7 , a full discussion of correlation 

 of these equivalent beds in Cebu is given, and Smith's and 

 Douville's 8 correlation tables are quoted. 



It is noteworthy that beds under discussion are classified by 

 Douville as Aquitanian. All who have studied the large fora- 

 minifera from the Philippine Islands agree that one of the char- 

 acteristic genera is Lepidocyclina. Cushman 9 in a recent paper 

 makes the following significant statement : "Because in general 

 Orbitoides, with some modifications to be noted in a future 

 paper, is Cretaceous, Orthophragmina Eocene, and Lepidocy- 

 clina Oligocene, much importance is attached to these organ- 

 isms in the investigation of problems of geologic correlation." 



• Pratt, W. E., and Smith, W. D., Phil. Jour. Sci., Vol. VIII, 1913, No. 5, Sec. A, 

 p. 330. 



7 Yabe, H., Science Reports, Tohoku Imperial University, 2nd Series, (Geol.), 

 Vol. V, No. 2, 1919, p. 40. 



• Douville, H., Les foraminiferes dans le Tertiaire des Philippines. Phil. Jour. Sci., 

 Vol. VI, 1911, No. 2, Sec. D, pp. 53-80. 



• Cushman, J. A., Orbitoid Foraminifera of the Genus Orthophragmina from Georgia 

 and Florida. U. S. G. S. Prof. Paper 108, 1918, p. 115. 



