IX, A, 2 



Pr^att: Geology of Cement Materials 



153 



the lower flanks of a cordillera made up of Pre-Oligocene igneous 

 and metamorphic rocks are the upturned edges of sedimentary- 

 beds which dip away from the axis of the cordillera on both 

 sides. Both the trend of the cordillera and the general strike 

 of the sedimentary rocks are north 20° east. West of the 

 cordillera is the Miocene series in which the Uling coal occurs, 

 while beds of tuff and limestone, more recent than the coal 

 measures, are encountered in considerable thickness on the 

 eastern flank of the igneous-metamorphic complex. 



The coal-bearing rocks consist of a basal conglomerate overlain 

 in turn by limestone, shales, fine-grained clastic rocks, alternating 

 shales and sandstones, and an upper limestone. Three coal 

 seams varying from 1 to 5 meters in thickness are intercalated 



Mioczne and Pre-Oligocene MioceneKl) Pliocene anc/ 

 Oligocene Igneous and ^hakdJuf/ond Pleiilocene 



Coal Meaiu res Metamor^hkCemplex L'imeifom Limirdfonei 



Wesf-norhweil 



tait-^ouihea^f^ 



Fig. 2. Diagrammatic cross section from the southeastern coast of Cebu to Mount Uling ; 

 length of section, 8 kilometers. (A) Limestones 35, 37, and 39; (B) andesitic agglomerate; 

 (C) hmestone 46; (D) tuff 47; (E) conglomerate, shale, etc.; (F) clastic rocks 48 and 49; 

 (G) limestone 50; (H) shale 51; (K) upper limestone of coal measures. 



with the alternating shales and sandstones, while a single seam 

 about 1 meter in thickness is found in the basal conglomerate. 

 The lowest member of the sedimentary series on the eastern 

 flank of the cordillera is also a conglomerate which is associated 

 at places with limestone, but no coal-bearing series overlies 

 these rocks; instead, are about 100 meters of shales, sands, 

 and clastic rocks overlain in turn by tuffs, limestones, volcanic 

 agglomerate, and at the top of the series by other limestones. 

 These most recent limestones are of Pliocene and Pleistocene 

 age according to Abella,^ and they are of widespread occurrence 

 along the entire coast line of Cebu. They are important as 

 cement raw materials, and samples 35, 37, and 39 are represent- 

 ative of them at the proposed manufacturing site. 



' IjOc. cit. 



126870- 



