218 cox. 



•Attention might also he called to the fact that owing to a relatively 

 large amount of calcium oxide contained in these shales themselves, 

 only a comparatively small amount of limestone would liave to l)e com- 

 bined with them and therefore a much larger deposit than is u?ual for 

 ordinary siliceous shales, would be necessary for a given output. 



THE KAW MATERIALS OF MOUXT LICOS REGION, XEAR DAXAO, CEBU. 



Although a few borings have been made, there is little doubt Init that 

 there is a large supply of raw materials in the Mount Licos region the 

 qualit)' can be ascertained from the following pages. Tbe map of the 

 Danao-Compostela coal district '* sliows the extent of the limestone. 

 Moitnt Licos is capped with a white, orbitoidal limestone, 30 to 1.50 

 meters thick. Limestone occurs abundantly in more or less detached 

 areas over the whole region as remnants of wlrat was most probably 

 originally a continuous lilanket. The shales and sandstone are mapped 

 under one color (blue). Dr. Smith has estimated that the total thick- 

 ness of the coarse, gray sandstone and the coal measure shales, including 

 five coal seams, is 90 to 1.50 meters^"; this also includes the shales which 

 have locally been weathered to clay. The lower part of tlie coal meas- 

 iires consists of gray shales and the upper portion of the coarse, gray 

 sandstone. The dip of the beds is naturally with the coal, whicli varies 

 upward from 20°. Some of the outcrops of the siliceous materials are 

 obliterated by covers of talus, others may l^e followed all the way up 

 the mountain side, whereas still others have been uncovered or more 

 exposed by railway cuts and mine drifts. The samples here discussed 

 represent large quantities, but were chosen rather to indicate what is 

 known of the character of the materials of the region than to represent 

 any particular bed. A knowledge of its chemical composition is of iirst 

 importance in the investigation of the suitability of a material for the 

 manufacture of a hydraulic cement and the data for the clays, shales 

 and limestone given in Table V will give the information required. 



DESCRU'TIOX OF S.\1[PLES. 



No. 1. Clay from a short distance beyond the upper terminus of the railway 

 of the Insular Coal Company. 



No. 2. Clay found under the Danao coal. 



No. 3. Shale dried at 105° C. 



No. 4. Calcareous shale from railway cut about 300 meters east of the terminus. 



No. 5. Shaly limestone. 



No. 6. Shaly limestone from the cut of the railway about 500 meters east of the 

 terminus. 



No. 7. "Upper limestone from Moxint Licos. Especial attention is called to the 

 absence of magnesium. 



"Smith, W. D. This Journal, Sec. .1. (1907), 2, 405. 

 '"Hid, 390. 



